JPH01310301A - Plastic mirror - Google Patents

Abstract

PURPOSE:To obtain the plastic mirror having high resistance to oil and wear by forming a ray reflecting layer on a polycarbonate molding and forming a protective film having the repeating unit of a prescribed compsn. thereon. CONSTITUTION:The ray reflecting layer is formed on the polycarbonate molding. The protective film essentially consisting of a curable phosphazene which has the repeating unit expressed by formula I and has >=3 degrees of polymn. is formed on the reflecting layer, by which the plastic mirror is formed. In formula, (a), (b) denote a>0, b>=0, and the real number satisfying a+b=2; A is a polymn. hardenable group and B is a non-polymn. hardenable group. Since the base body of this plastic mirror consists of the polycarbonate, the mirror is light in weight and since the mirror is coated with the protective film essentially consisting of the curable phosphazene compd., the mirror is excellent in the resistance to oil, wear and impact, an antifogging property and reflection performance. In addition, the polycarbonate has excellent moldability and, therefore, the integral molding of the mirror to a desired shape is possible and the production cost is reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a plastic mirror, and more specifically, it is made of polycarbonate with a light reflecting layer such as a metal vapor deposited layer and a specific protective layer, and has excellent reflective properties and anti-fogging properties. The present invention relates to plastic mirrors that are particularly suitable as automobile mirrors, such as rearview mirrors, fender mirrors, and room mirrors, which have excellent impact resistance, abrasion resistance, and light weight.

[Prior Art and Problems to be Solved by the Invention] Conventionally, mirrors have generally been made of glass plates, especially for automobiles (buses).

Also includes trucks, railroad cars, airplanes, and helicopters.

same as below. ) have various problems, including their large weight.

In general, car mirrors such as fender mirrors have the same excellent reflective performance as regular mirrors, as well as (1) anti-fog properties that prevent raindrops and snow from adhering to them, and prevent them from fogging even if they do. (2) have sufficient abrasion resistance to withstand the repeated use of car wash brushes; (3) have oil resistance to withstand splashing of gasoline and the use of kerosene for cleaning car bodies; (4) fuel efficiency. It is required that the vehicle be lightweight in order to save energy and save energy, and (5) have impact resistance that can withstand vibrations and impacts during driving.

However, the glass mirrors that have been widely used have low impact resistance, which poses a high risk of injury from sharp fragments when broken, and they are also heavy and have poor anti-fog properties. There is also a problem that oil resistance and abrasion resistance are not necessarily sufficient.

In recent years, attempts have been made to use various plastic mirrors as substitutes for glass mirrors, and although some success has been achieved, there is no practical level of satisfaction as a substitute for automobile mirrors, which have particularly demanding characteristics. The current situation is that kimonos have not yet been developed.

Therefore, the inventor of the present invention overcame the drawbacks of such prior art and
We conducted extensive research to develop plastic mirrors, especially plastic mirrors for automobiles, that have sufficient performance for practical use.

[Means to solve the problem]

As a result, we have found that by selecting polycarbonate from among a variety of plastics, forming a light reflecting layer on it, and coating it with a curable phosphazene compound, a plastic mirror with the desired performance can be obtained. The present invention was completed based on this knowledge.

That is, the present invention forms a light-reflecting layer on a polycarbonate molded product, and also has the general formula % (%) [where a, b are a>O, b≧0, and parentheses a+b=
represents a real number satisfying 2, A represents a polymerizable curable group, and B represents a non-polymerizable curable group. The present invention provides a plastic mirror formed with a protective film mainly composed of a curable phosphazene compound having a repeating unit represented by the following formula and having a degree of polymerization of 3 or more.

As described above, a polycarbonate molded product is used for the substrate of the plastic mirror of the present invention. Here, the shape of the polycarbonate molded product is not particularly limited, and various shapes including a plate shape can be used depending on the purpose. In addition, as polycarbonate, as long as it has transparency,
Various materials can be used, but even opaque materials can be used satisfactorily if the method of forming the light reflecting layer and the protective layer is devised.

Generally speaking, polycarbonate obtained by reacting bisphenol A with phosgene (or carbonate ester) may be used as such polycarbonate, but various other types such as polycarbonate having substituents such as halogen or alkyl groups can also be used. It is possible.

Note that if other plastics, such as acrylic resin, are used instead of polycarbonate, a problem arises in that the heat resistance and impact resistance are poor, and the object of the present invention cannot be achieved.

The plastic mirror of the present invention is obtained by forming a light reflecting layer and a protective film on the polycarbonate molded article described above. Various methods are possible for forming this light-reflecting layer and protective film on a polycarbonate molded product, but in short, the light-reflecting layer is formed to function as a mirror, and the surface of the polycarbonate molded product is coated with an external physical layer. A protective film may be formed to protect it from chemical stimulation. Specifically, (1) a mode in which a light reflecting layer is formed on the back surface of the polycarbonate molded product, and a protective film is formed on the surface of the polycarbonate molded product; (2)
A light reflecting layer is formed on the surface of the polycarbonate molded product,
Furthermore, a mode in which a protective film is formed on the surface of the reflective layer, (3) a protective film is formed on the surface of the polycarbonate molded product, a light reflecting layer is formed on the surface of the protective film, and a protective film is further formed on the surface of the reflective layer. The form of formation can be cited as preferred.

Here, the light reflecting layer reflects the light rays incident on the mirror with a high reflectance, and is generally made of silver.

It is composed of a vapor-deposited layer of metal such as aluminum.

Next, as mentioned above, the protective film contains as a main component a phosphazene compound having a repeating unit represented by the general formula (1), but the general formula (1) here does not represent a single compound; It is expressed as an average value of a mixture of several compounds. Therefore, a and b indicating the number of each store are not necessarily limited to integers, but are real numbers including decimals.

Similarly, the degree of polymerization is a real number that includes not only integers in the range of 3 or more but also decimals.

There are various phosphazene compounds having the repeating unit of the above general formula (1) depending on the type of each substituent.

In the formula, A represents a polymerizable curable group, and this polymerizable curable group refers to irradiation with ultraviolet rays, visible light, or electron beams.

It refers to a functional group that reacts and cures by using a chemical curing agent or by heating, and is usually a group having a reactive double bond. There are various types of groups having this reactive double bond, such as functional groups containing an acryloyl group, a methacryloyl group, or an allyl group.

The above-mentioned functional group containing an acryloyl group or a functional group containing a methacryloyl group can be an acryloyloxy group, a methacryloyloxy group, or a general formula [wherein, R' represents a hydrogen atom or a methyl group, and R2 has a carbon number of 1 to 12]. (preferably 1 to 5) alkylene groups (including branched alkylene groups). ).

Specific examples of the group represented by this general formula (ff) are:
2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate 3-hydroxypropyl methacrylate, 2-hydroxybutyl methacrylate, 3
-Hydroxybutyl methacrylate, 4-hydroxybutyl methacrylate, 5-hydroxypentyl methacrylate.

6-hydroxy-3-methylhexyl methacrylate,
5-Hydroxyhexyl methacrylate.

Hydroxyl groups in methacrylates such as 3-hydroxy-2-t-butylpropyl methacrylate, 3-hydroxy-2,2-dimethylhexyl methacrylate, 3-hydroxy-2-methyl-2-ethylpropyl acrylate, and 12-hydroxydodecyl methacrylate. Residues from which hydrogen atoms have been removed, as well as 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate 3-
Hydroxypropyl acrylate, 2-hydroxybutyl acrylate 3-hydroxybutyl acrylate
4-hydroxybutyl acrylate 5-hydroxypentyl acrylate, 6-hydroxy-3-methylhexyl acrylate, 5-hydroxyhexyl acrylate 3-hydroxy-2-t-butylpropyl acrylate, to 3-hydroxy-2,2-dimethyl Examples include residues obtained by removing a hydrogen atom from a hydroxyl group in acrylates such as xyl acrylate, 3-hydroxy-2-methyl-2-ethylpropyl acrylate, and 12-hydroxydodecyl acrylate. Particularly preferred groups are 2-hydroxyethyl methacrylate residues and 2-
It is a hydroxyethyl acrylate residue.

In addition to the functional groups containing the acryloyl group and methacryloyl group, in addition to those of the above-mentioned general formula (I[), the functional groups include those of the general formula [where R' and R2 are as defined above]. ], i.e., hydroxyalkyl-substituted (meta)
A residue obtained by removing a hydrogen atom from the hydroxyl group of acrylamide, and further a general formula CH, = c-C-N H-... (IV) [in the formula, R
1 is the same as above. ] Examples include functional groups represented by the following, ie, residues obtained by removing one hydrogen atom from the amino group of acrylamide or methacrylamide.

Furthermore, as a functional group containing an allyl group, in addition to the allyl group itself, for example, an allyloxy group (CH2=CH-C
H20-), but it is not limited to this allyloxy group, but is broadly applicable to the general formula [wherein R1-R4 are the same as above. ], ie, a residue obtained by removing a hydrogen atom from the hydroxyl group of an allyl compound having one hydroxyl group. Specific examples of the functional groups represented by the general formulas (V) to [■] include CH2=CHCHt OH, CHt=CHC
HOH.

H3 CH.

CHt=CH-C-OH, CHz=C-CHt-011
゜CH, CI.

CH.

There are residues obtained by removing the hydrogen atom from the hydroxyl group in allyl compounds such as

On the other hand, B in general formula (1) is represented by the general formula
R'M-... [■] Indicates a group represented by or. Here, M in the formula [■] represents an oxygen atom, a sulfur atom, or an imino group, and R5 has 1 to 1 carbon atoms.
8 alkyl group or a halogenated alkyl group having 1 to 1 carbon atoms. Specifically, alkoxy groups such as methoxy group, ethoxy group, propoxy group, butoxy group, pentyloxy group, hexyloxy group, heptyloxy group, and octyloxy group, and substituted with halogen (e.g. fluorine, chlorine, bromine, etc.) similar alkoxy groups, alkylthio groups such as methylthio group, ethylthio group, propylthio group, butylthio group, pentylthio group, heptylthio group, octylthio group, similar alkylthio groups substituted with halogen (e.g. fluorine, chlorine, bromine, etc.), Alkylimino groups such as methylimino group, ethylimino group, propylimino group, butylimino group, pentylimino group, hexylimino group, heptylimino group, octylimino group.

Similar alkylimino groups substituted with halogen (eg, fluorine, chlorine, bromine, etc.) can be mentioned. In addition, M in formula (IX) is the same as above, R6, RIG
are each independently a hydrogen atom, a halogen atom, a carbon number of 1 to
4 alkyl group or a halogenated alkyl group having 1 to 4 carbon atoms. The group of formula (IX) specifically includes a phenoxy group, a thiophenyl group, a halogenated phenoxy group (2,4
,6-)lipromophenoxy group, 4-promophenoxy group.

2-chlorophenoxy group, 2,4-dichlorophenoxy group, etc.) and halogenated thiophenyl group (4-chlorophenylthio group, etc.), or aniline and halogenated aniline (2-chloroaniline, 2,4-dichloroaniline, etc.) Examples include residues obtained by removing a hydrogen atom from the amino group of 2,4,6-dolipromoaniline, etc.).

Furthermore, regarding a and b in the general formula (r) mentioned above, O<
Any real number that satisfies a≦2, 0≦b<2 and a+b=2 may be sufficient, but preferably 0.6≦a≦2. 0≦
b≦1.4. .

Note that the substituent A is a group that acts when the protective film containing the phosphazene compound of general formula [1] as a main component is cured,
Moreover, substituent B is a group that exhibits the effect of controlling the physical properties of the cured product and controlling the polymerization performance. Therefore, by appropriately selecting a and b, the physical properties of the protective film containing the phosphazene compound as a main component are determined.

However, since phosphazene compounds with a=0 do not have curability, such phosphazene compounds are excluded from the components of the protective film of the present invention. However, the one where a=2゜b=o, that is, the general formula +N P (A) r3- ... [Bi]
A phosphazene compound having a repeating unit represented by can be used as a component of the protective film of the present invention.

The phosphazene compound in the present invention has the above-mentioned general formula C
I), and its degree of polymerization is 3 or more, preferably in the range of 3 to 10,000, more preferably in the range of 3 to 18, especially 3 or 4.
Or a mixture thereof is optimal. Also, the general formula (
Although some repeating units of 1) are bonded (polymerized) in a chain, preferred are those in which the repeating units of 1) are bonded (polymerized) in a ring.

Specific examples of such phosphazene compounds are as follows.

A cyclic compound represented by

formula %formula%) A cyclic compound represented by

−−−+N P (OCtHaOtCCH= CHz)
A cyclic compound represented by z+-r.

formula %formula%) A cyclic compound represented by

(Left below) 2 ・Kouji 〇Q OO 瓢 ″ p 翢 -P Shigeru -P, etc.

Such phosphazene compounds can be produced by various methods and are not particularly limited. For example, when it is desired to introduce a group represented by general formula (I[) as rvl, substituent A, hydroxyalkyl (meth)acrylate corresponding to this general formula (II), that is, general formula % formula % [in the formula, Rl , R! is the same as above. ] When using a hydroxyalkyl (meth)acrylate represented by the formula (III) and introducing a group represented by the general formula (III) as a substituent, the corresponding general formula % formula % [where Rl, R! is the same as above. ] When using a hydroxyalkyl (meth)acrylamide represented by the formula (IV) and wishing to introduce a group represented by the general formula (IV) as the substituent A, the corresponding general formula % formula % [wherein R1 is the same as above] When using (meth)acrylamide represented by the same ] or introducing a group represented by general formulas (V) to [■] as the substituent A, the corresponding general formula % formula % [in the formula, R', R'', and R' are the same as above.] Allyl alcohol, allylphenol, allyl ester of hydroxybenzoic acid, or a derivative thereof is used.

On the other hand, in the group represented by the general formula [■] introduced as the substituent B, when M is an oxygen atom, R'OH [in the formula, R5 is the same as above. ] Using an alkanol, a halogenated alkanol or a derivative thereof, and when M is a sulfur atom, R'S H [wherein R5 is the same as above. ] Using an alkyl mercaptan, a halogenated alkyl mercaptan, or its mR form, and when M is an imide group, R'NH.

[In the formula, RS is the same as above. ]

An alkylamine, a halogenated alkylamine, or a derivative thereof is used.

Further, in the group represented by the general formula (IX) introduced as the substituent B, when M is an oxygen atom, the general formula [wherein R6 to R1° are the same as above] is used. ], and when M is a sulfur atom, the general formula [wherein R6 to R1° are the same as above] is used. ], and when M is an imino group, the general formula [wherein 17 &, Rl G are the same as above]. ] Aniline or its derivatives are used.

The compound forming substituent A and the compound forming substituent B are combined into chlorophosphazene (formula (NP(1,)
, or 2Cε, P・(N
By reacting with a chain compound represented by P Cgz)tt-t'NP Cgi, where n is 3 or more, preferably 3 to 18), the desired phosphazene compound of general formula (1) can be obtained.

In addition, when the compound forming the above-mentioned substituent B is an alcohol, mercaptan, phenol or thiophenol, alkali metal such as metallic sodium or metallic potassium is reacted in advance to form alcoholade, phenolate, etc. It is preferable to use mercaptides and thiophenolates.

Further, in the reaction of the compounds forming the above-mentioned substituents A and B with chlorophosphazene, it is preferable to use a dehydrohalogenating agent such as a tertiary amine. Examples of the tertiary amine include trimethylamine, triethylamine, triisopropylamine, trin-
Examples include propylamine, tri-n-butylamine, and pyridine, among which pyridine is preferred.

Furthermore, this reaction is usually carried out in an organic solvent.

Benzene and toluene are used as organic solvents.

Examples include xylene, chloroform, cyclohexane, methylene chloride, tetrahydrofuran, and 1,4-dioxane. These can be used alone or in combination.

In addition, in the curable phosphazene compound obtained by the above reaction, it is preferable that all the chlorine atoms of the raw material chlorophosphazene are substituted with the above-mentioned substituents, but some chlorine may remain.

Through the reaction described above, a curable phosphazene compound, which is the main component of the protective film formed on the surface of the polycarbonate molded article or on the light reflecting layer, is obtained.

In order to form a protective film on the surface of the polycarbonate molded product or on the light reflecting layer formed on the surface, the above-mentioned phosphazene compound or, if necessary, a monofunctional monomer copolymerizable with the phosphazene compound and/or A coating solution containing a polyfunctional monomer and commonly used additives is prepared and applied to the surface of a polycarbonate molded product or a light reflecting layer formed on the surface, and then irradiated with active energy rays or heated. It may be hardened by doing the following.

An example of a monofunctional monomer or polyfunctional monomer copolymerizable with a phosphazene compound is an acryloyl group.

Compounds having a reactive double bond, such as various compounds having a methacryloyl group, a vinyl group, or an allyl group, can be mentioned.

Furthermore, various additives may be added within the range that does not impair the purpose of the present invention. Examples of additives include inorganic fillers, organic fillers, lubricants, and the like.

As the inorganic filler, finely powdered silica, alumina, glass, ceramic, etc. (solvent-dispersed type may be used) can be used.

Furthermore, examples of the organic filler include acrylic resin in the form of fine powder.

The lubricant may be in any form such as liquid, solid, or grease-like, and silicone-based, fluorine-based, or other synthetic lubricants, Teflon fine particles, molybdenum disulfide, or the like can be used.

Further, the coating liquid can be used after being diluted with an organic solvent from the viewpoint of workability, film thickness control, etc. As such organic solvents, ketones such as methyl ethyl ketone and methyl isobutyl ketone, alcohols such as 2-propanol and 1-butanol, cellosolves, acetic esters, ethers, aromatic hydrocarbons, etc. may be used alone or in appropriate mixtures. can be used.

For curing after coating, methods such as active energy ray (visible light, ultraviolet rays, electron beams, X-rays, gamma rays, etc.) irradiation, heat curing, room temperature curing, etc. are used as described above.

Note that when using a curing method using visible light or ultraviolet light, a reaction initiator (photosensitizer) is used. Such a reaction initiator may be added to the coating solution. Examples of reaction initiators are 1-hydroxycyclohexylphenyl ketone, dibenzoyl.

Benzoyl, benzoin methyl ether, benzoin ethyl ether, P-chlorobenzophenone.

Examples include p-methoxybenzophenone, benzoyl peroxide, di-t-butyl peroxide and camphorquinone, which can be used alone or in combination.

In addition, when using heat curing or room temperature curing methods,
As the polymerization initiator, peroxide compounds and amine compounds are usually used alone or in combination. Examples of peroxide compounds include benzoyl peroxide; p-chlorobenzoyl peroxide; 2,4-dichlorobenzoyl peroxide; t-butyl hydroperoxide; di-t-butyl peroxide; dicumyl peroxide. ; t-butylperoxyacetate; t
-butyl peroxybenzoate and the like. In addition, examples of amine compounds include N, N
-jetanol-p-toluidine; dimethyl-P-)
luidine; P-) luidine; methylamine; L-butylamine; methylethylamine; diphenylamine; 4,
4'-dinitrodiphenylamine;0-nitroamine;
Examples include p-bromoaniline and 2,4.6-1-ribromoaniline.

An example of the composition of the components forming the protective film of the present invention is shown below.

(a) Phosphazene compound 100 parts by weight) Monofunctional monomer and/or polyfunctional monomer copolymerizable with the phosphazene compound 0 to 100 parts by weight (C)
Organic solvent (d) Photoinitiator or thermal polymerization initiator 0.05-5
Parts by weight [based on 100 parts by weight of the curable compounds (a) and (b)] It is not necessary to use an organic solvent, but as mentioned above, it is preferable from the viewpoint of workability and control of the film thickness after curing. The weight concentration of the mixture of (a) and (b) above is 0.5 to 60
% in an organic solvent.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

Production Example 1 Production of Curable Phosphazene Compound (A) II equipped with a thermometer, a stirring device, two dropping funnels and a condenser! ,
58.0 g of hexachlorocyclotriphosphazene (cyclic compound of formula (NPCI!, z)+) in a volumetric flask.
(0,167 mol), toluene 50- and pyridine 1
68 g (2.0 mol) was added and stirring was started.

Next, 14.3 g of 2-hydroxyethyl methacrylate (
1.1 mol) was gradually added dropwise from the dropping funnel.

The mixture was heated to 60°C in a water bath and the reaction was carried out for 8 hours with stirring.

Next, the precipitated crystals and catalyst were separated by filtration, the solvent in the obtained filtrate was removed by vacuum distillation, and the residue was thoroughly dried to obtain 138 g of a yellow liquid.

The yield was 91%.

As a result of analysis, this product has a viscosity of 1.1, 3, 3°5.
5-hexa(methacryloylethylenedioxy)cyclotriphosphazene CH.

(Formula (NP (OCzHaOzCC= CHz)z
) was a cyclic phosphazene compound represented by z).

Production Example 2 Production of Curable Phosphazene Compound 171 (B) 12 equipped with a thermometer, stirring device, dropping funnel and condenser
100 g of tetrahydrofuran and 11.5 g (0.5 g) of sodium metal were placed in a 100 g flask. In this reaction solution, 55% of 2.2.2-drifluoroethanol was added.
5 g (0.55 mol) was added dropwise, and the reaction was carried out under reflux until the sodium disappeared.

Next, 39.6 g of hexachlorocyclotriphosphazene
A solution of (0,111 mol) dissolved in 100% toluene was added dropwise to the above reaction solution, and the reaction was allowed to proceed for 2 hours under reflux.

Then, the temperature of the reaction solution was cooled to room temperature.

Additionally, 191g of 2-hydroxyethyl methacrylate
(1.23 mol) was slowly added dropwise from the dropping funnel.

Next, the reaction was carried out for 8 hours while heating to 60°C in a hot water bath and stirring, and the precipitated crystals and catalyst were separated by filtration. The solvent in the obtained filtrate was removed by thin distillation under reduced pressure, and the residue was thoroughly After drying, 88 g of yellow liquid 4J was obtained. Yield is 93%
Met.

Reference example (preparation of coating liquid) Each component was prepared in the following proportions, and coating liquids (a) and (b) were prepared.
) was prepared.

11%m Curable phosphazene compound (A) 30g isopropyl alcohol 20g methyl isobutyl ketone 30g butanol
20g 1-Hydroxycyclohexyl phenyl ketone (photoinitiator) 1g ILL and curable phosphazene compound@h(B) 30g isopropyl alcohol 20g methyl isobutyl ketone 30g butanol
20g 1-hydroxycyclohexyl phenyl ketone (photoinitiator) 1g Test example 1 Transparent polycarbonate plate (120x120x3mm)
(specific gravity 1.2) was coated with the coating solution (a) obtained in the above reference example.
) was applied to a film thickness of 5 μm, and while the polycarbonate plate was conveyed by a belt conveyor at a conveyance speed of 1 m/min, the cumulative light amount was 2940 mJ/c.
1! The irradiation distance from the 80W ultraviolet light source is 1, so that
Irradiate the polycarbonate plate with ultraviolet rays at a distance of 5 cm,
A cured coating film (protective film) was formed.

First, various physical properties of the obtained polycarbonate plate with a protective film were evaluated.
Shown in the table.

Test Example 2 In Test Example 1, coating liquid (a) was replaced with coating liquid (a).
The same operation as Test Example 1 was performed except that b) was used.

First, various physical properties of the obtained polycarbonate plate with a protective film were evaluated.
Shown in the table.

Example 1 Polycarbonate was prepared in the same manner as in Test Example 1, except that a polycarbonate plate (120 x 120 x 3 mm) (specific gravity 1.2) with an aluminum vapor-deposited layer on the back side was used instead of the transparent polycarbonate plate. A cured coating film (protective film) having a film thickness of 5 μm was formed on the surface of the plate.

Table 1 shows various physical properties of the obtained polycarbonate mirror with a protective film.

Example 2 Polycarbonate was prepared in the same manner as in Test Example 2, except that a polycarbonate plate (120 x 120 x 3 mm) (specific gravity 1.2) with an aluminum vapor-deposited layer on the back side was used instead of the transparent polycarbonate plate. A cured coating film (protective film) having a film thickness of 5 μm was formed on the surface of the plate.

Table 1 shows various physical properties of the obtained polycarbonate mirror with a protective film.

Comparative Example 1 Using a commercially available silicone coating material (coating solution (C)) as a coating solution, this was applied onto the same transparent polycarbonate plate (120 x 120 x 3M) as in Test Example 1 so that the coating thickness was 5 μm, A cured coating film (protective film) was formed by heating at 90°C for 1 hour.

First, various physical properties of the obtained polycarbonate plate with a protective film were evaluated.
Shown in the table.

Comparative Example 2 The same operation as in Test Example 1 was performed except that a commercially available acrylic coating material (coating solution (d)) was used instead of coating solution (a).

First, various physical properties of the obtained polycarbonate plate with a protective film were evaluated.
Shown in the table.

Comparative Example 3 In Test Example 1, a transparent plate glass (120X120X3ma+) (specific gravity 2.5) was used instead of the polycarbonate plate.
) was used, but the same operation as in Test Example 1 was performed.

Table 1 shows various physical properties of the obtained plate glass with a protective film.

Comparative Example 4 Various physical properties were evaluated on a transparent plate glass (120 x 120 x 3 cabinets) as it was (without forming a protective film). The results are shown in Table 1.

Comparative Example 5 Transparent polycarbonate plate (120X120X3aa)
Various physical properties were evaluated in the as-is state (without forming a protective film). The results are shown in Table 1.

Comparative Example 6 Various physical properties were evaluated on a polycarbonate plate (120 x 120 x 3 mm) (specific gravity 1.2) with an aluminum vapor-deposited layer provided on the back surface as it was (without forming a protective film). The results are shown in Table 1.

(The following is a blank space) [Effects of the Invention] As mentioned above, the plastic mirror of the present invention is lightweight because the base is made of polycarbonate, and is coated with a protective film containing a specific curable phosphazene compound as the main component. Therefore, it has excellent oil resistance, abrasion resistance, impact resistance, anti-fog properties, and reflective performance. Moreover, since polycarbonate has excellent moldability, the plastic mirror of the present invention can be integrally molded into a desired shape, and manufacturing costs can be reduced.

Therefore, the plastic mirror of the present invention can be suitably used as a rearview mirror, a fender mirror, a rearview mirror of an automobile, and other mirrors for various purposes.

Patent applicant: Idemitsu Petrochemical Co., Ltd.
:, j

Claims (4)

[Claims] (1) In addition to forming a light reflecting layer on polycarbonate molded products, there are general formulas ▲ mathematical formulas, chemical formulas, tables, etc. ▼ [In the formula, a and b are a>0, b≧0, and a+b=
represents a real number satisfying 2, A represents a polymerizable curable group, and B represents a non-polymerizable curable group. ] A plastic mirror formed with a protective film containing a curable phosphazene compound as a main component and having a degree of polymerization of 3 or more. (2) A plastic mirror formed by forming a light reflecting layer on the back surface of a polycarbonate molded product and forming a protective film containing the curable phosphazene compound of claim 1 as a main component on the surface of the polycarbonate molded product. (3) A plastic mirror formed by forming a light reflecting layer on the surface of a polycarbonate molded article, and further forming a protective film containing the curable phosphazene compound according to claim 1 as a main component on the surface of the reflecting layer. (4) A protective film containing the curable phosphazene compound of claim 1 as a main component is formed on the surface of the polycarbonate molded article, and a light reflecting layer is formed on the surface of the protective film, and further a light reflecting layer is formed on the surface of the reflective layer as claimed in claim 1. A plastic mirror formed with a protective film mainly composed of a curable phosphazene compound.