JPH06145516A - Polyimide resin composition - Google Patents

Abstract

PURPOSE:To obtain the title molding composition which is excellent in heat resistance, chemical resistance, mechanical strength, and moldability by mixing a specific polyimide with a polycarbonate in a given proportion. CONSTITUTION:The composition comprises 99.5-50wt.% polyimide having repeating units basically represented by the formula wherein R is a 2C or higher tetravalent group selected from an aliphatic group, an alicyclic group, a monocyclic aromatic group, a fused aromatic group, and a nonfused aromatic group consisting of aromatic groups bonded together directly or through a crosslinking member and 0.1-50wt.% polycarbonate (e.g. Panlite L-1225, manufactured by Teijin Chemicals Ltd.).

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a molding resin composition. More specifically, it relates to a polyimide-based molding resin composition having excellent heat resistance, chemical resistance, mechanical strength, and the like, and excellent molding processability.

[0002]

2. Description of the Related Art Conventionally, in addition to its high heat resistance, polyimide has excellent mechanical strength, dimensional stability, flame retardancy, electrical insulation, etc., and therefore electrical and electronic equipment, aerospace equipment, and transportation equipment. It is used in the fields such as, and is expected to be widely used in the fields where heat resistance is required.

Conventionally, various polyimides having excellent characteristics have been developed. However, even if it has excellent heat resistance,
Since it does not have a clear glass transition temperature, it must be processed by using a method such as sintering when used as a molding material, and it has excellent processability, but it has a low glass transition temperature and a halogen Soluble in hydrocarbons,
In terms of heat resistance and solvent resistance, it was not satisfactory, and there were merits and demerits in performance.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to obtain a polyimide resin composition which has not only excellent properties inherent to polyimide but also excellent moldability.

[0005]

Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventors have found that a polyimide-based resin composition comprising a novel polyimide and a specific amount of polycarbonate is particularly aimed at the above-mentioned object. The inventors have found that it is effective and completed the present invention.

The inventor of the present invention has previously shown that polyimide having excellent mechanical properties, thermal properties, electrical properties, solvent resistance, etc. and heat resistance is represented by the formula (1) (formula 2):

[0007]

[Chemical 2]

[In the formula, R represents an aliphatic group having 2 or more carbon atoms, a cycloaliphatic group, a monocyclic aromatic group, a condensed polycyclic aromatic group, or an aromatic group, either directly or by a crosslinking member. It represents a tetravalent group selected from the group consisting of linked non-fused polycyclic aromatic groups. ] A resin having a repeating unit represented by the following formula was found (JP-A-63-243132, etc.).

The above-mentioned polyimide is a novel heat resistant resin having many good physical properties peculiar to polyimide. However, compared with ordinary engineering plastics represented by polyethylene terephthalate, polybutylene terephthalate, polyester sulfone, polysulfone, polyphenylene sulfide, etc., they are far superior in heat resistance and other characteristics, but their molding processability is excellent. I haven't reached yet.

It is an object of the present invention to provide a polyimide resin composition for molding which is extremely excellent in terms of melt flowability without impairing the inherent properties of polyimide. That is, the present invention provides the formula (1) (formula 3)

[0011]

[Chemical 3]

[Wherein R is an aliphatic group having 2 or more carbon atoms, a cycloaliphatic group, a monocyclic aromatic group, a condensed polycyclic aromatic group, or an aromatic group, either directly or by a cross-linking member. It represents a tetravalent group selected from the group consisting of linked non-fused polycyclic aromatic groups. ] Polyimide 9 having a repeating unit represented by
A resin composition composed of 9.9 to 50% by weight and polycarbonate of 0.1 to 50% by weight.

The polyimide used in the present invention is produced by the method described in the above-mentioned JP-A-63-243132. That is, the polyimide of the present invention, as a diamine, has the formula (2)

[0014]

[Chemical 4]

An ether diamine represented by the following formula: bis [4- {3- (4-aminophenoxy) benzoyl} phenyl] ether is used, and this is reacted with one or more tetracarboxylic acid dianhydrides. It is obtained by imidizing the obtained polyamic acid. The tetracarboxylic dianhydride used at this time is represented by the formula (3)

[0016]

[Chemical 5]

A tetracarboxylic acid dianhydride represented by the formula: wherein R is the same as above. That is, as the tetracarboxylic dianhydride used, ethylene tetracarboxylic dianhydride, butane tetracarboxylic dianhydride, cyclopentane tetracarboxylic dianhydride, pyromellitic dianhydride, 3,3 ' , 4,4'-benzophenone tetracarboxylic dianhydride, 2,2 ', 3,3'-benzophenone tetracarboxylic dianhydride, 3,3'4,4'-biphenyltetracarboxylic dianhydride, 2 , 2 ', 3, 3'-
Biphenyl tetracarboxylic dianhydride, bis (3,4-
Dicarboxyphenyl) ether dianhydride, bis (3,3
4-dicarboxyphenyl) sulfone dianhydride, bis (2,3-dicarboxyphenyl) methane dianhydride, bis (3,4-dicarboxyphenyl) methane dianhydride,
1,1-bis (2,3-dicarboxyphenyl) ethane dianhydride, 2,2-bis (3,4-dicarboxyphenyl) propane dianhydride, 2,2-bis (2,3-dicarboxy) Phenyl) propane dianhydride, (4,4'-p-
Phenylenedioxy) diphthalic acid dianhydride, 4,4'-
(M-phenylenedioxy) diphthalic acid dianhydride, 2,
3,6,7-naphthalenetetracarboxylic dianhydride,
1,4,5,8-naphthalenetetracarboxylic dianhydride, 1,2,5,6-naphthalenetetracarboxylic dianhydride, 1,2,3,4-benzenetetracarboxylic dianhydride, 3, 4,9,10-perylenetetracarboxylic dianhydride, 2,3,6,7-anthracenetetracarboxylic dianhydride, 1,2,7,8-phenanthrenetetracarboxylic dianhydride, and the like. The tetracarboxylic dianhydride may be used alone or in combination of two or more.

The polyimide represented by the formula (1) used in the method of the present invention is obtained by reacting the diamine represented by the formula (2) with the tetracarboxylic dianhydride represented by the formula (3) as described above. can get. The reaction method is not particularly limited,
Although known methods can be used without restriction, carrying out in an organic solvent is a particularly preferred method. In addition to the above two components, the reaction in the presence of a dicarboxylic acid anhydride and / or a monoamine is an effective method for improving moldability and heat resistance. The polycarbonate used as the fluidization accelerator in the present invention has the general formula (4)

[0019]

[Chemical 6]

[Wherein Y is selected from the group consisting of a direct bond, a divalent hydrocarbon group having 1 to 10 carbon atoms, a hexafluorinated isopropylidene group, a carbonyl group, a sulfonyl group, an ether group and a thio group. And R _{1 to} R ₄ represent hydrogen, a lower alkyl group, a lower alkoxy group, chlorine or bromine, and may be the same or different from each other. ] And is commercially available as Lexan (Trademark of Engineering Plastics), Panlite (Teijin Kasei trademark), Iupilon (Mitsubishi Gas Chemical trademark), Novarex (Mitsubishi Kasei trademark), etc. Any blend having appropriate melt viscosity characteristics can be selected on the market.

The molding resin composition of the present invention comprises 99.9 to 50% by weight of the polyimide and 0.1 to 10% of the polycarbonate.
It is adjusted to be in the range of 50% by weight. The polyimide / polycarbonate resin system of the present invention exhibits remarkably low melt viscosity in a high temperature range of 280 ° C. or higher. The good fluidizing effect of polycarbonate is recognized even in a small amount, and the lower limit of the composition ratio is 0.1% by weight, but preferably 0.1.
It is 5% by weight or more.

Further, the water absorption and flame retardancy of polycarbonate belong to a very excellent class among heat resistant resins.
Since the chemical resistance and heat resistance are inferior to polyimide,
If the amount of the polycarbonate in the composition is too large, the chemical resistance and heat resistance inherent to the polyimide cannot be maintained, which is not preferable. Therefore, the composition ratio of the polycarbonate has an upper limit and is preferably 50% by weight or less.

When the composition according to the present invention is mixed and adjusted, it can be produced by a generally known method. For example, the following method is a preferable method. 1. The polyimide powder and the polycarbonate powder are pre-kneaded into a powder using a mortar, a Henschel mixer, a drum blender, a tumbler blender, a ball mill ribbon blender and the like. 2. The polyimide powder is dissolved or suspended in an organic solvent in advance, and polycarbonate is added to this solution or suspension to uniformly disperse it, and then the solvent is removed to obtain a powder. 3. After suspending the polycarbonate in an organic solvent solution of a polyamic acid which is a precursor of the polyimide, 100 to 40
After heat treatment at 0 ° C. or chemical imidization using a commonly used imidizing agent, the solvent is removed to obtain a powder.

The powdery polyimide resin composition thus obtained is used as it is for various molding applications, such as injection molding, compression molding, transfer molding, and extrusion molding. This is the preferred method. Particularly, in mixing and preparing the composition, it is a simple and effective method to mix powders, mix pellets, or mix powders and pellets.

For melt blending, the equipment used for melt blending conventional rubbers or plastics such as hot rolls, Banbury mixers, Brabenders, extruders and the like can be utilized. The melting temperature is set above the melting temperature of the compounding system and below the temperature at which the compounding system begins to thermally decompose, but the temperature is usually 280 to 420.
C., preferably 280 to 350.degree.

The molding method of the resin composition of the present invention includes:
Extrusion molding or injection molding, which is a molding method that forms a homogeneous melt blend and has high productivity, is suitable, but transfer molding, compression molding, sinter molding or the like may be applied. One or more solid lubricants such as molybdenum disulfide, graphite, boron nitride, lead monoxide, and lead powder can be added to the resin composition of the present invention.

Further, it is possible to add one or more reinforcing agents such as glass fiber, carbon fiber, aromatic polyamide fiber, potassium titanate fiber and glass beads. Incidentally, with respect to the resin composition of the present invention, within a range that does not impair the object of the present invention, an antioxidant, a heat stabilizer, an ultraviolet absorber, a flame retardant, a flame retardant aid, an antistatic agent, a lubricant, One or more conventional additives such as colorants can be added.

[0028]

EXAMPLES The present invention will be described in more detail with reference to Synthesis Examples, Examples and Comparative Examples. Synthesis Example 1 Bis [4- {3- (4-aminophenoxy)] was added to a container equipped with a stirrer, a reflux condenser, a water separator and a nitrogen introducing tube.
Benzoyl} phenyl] ether 5.92 kg (10.
0 mol), 3,3 ', 4,4'-biphenyltetralbonic acid dianhydride 2.84 kg (9.65 mol), phthalic anhydride 0.1037 kg (0.7 mol), and cresylic acid 35.4 kg Was charged and the temperature was raised to 145 ° C. with stirring under a nitrogen atmosphere. Further, the reaction was carried out at 145 ° C. for 4 hours. After that, cool to room temperature, about 40
After charging with kg of methyl ethyl ketone, it was filtered to obtain a yellow polyimide powder. After washing this polyimide powder with methyl ethyl ketone, it was dried under reduced pressure at 180 ° C. for 24 hours.
08 kg (yield 96%) of polyimide powder was obtained. The polyimide powder had an inherent viscosity of 0.51 dl / g, a glass transition temperature of 196 ° C., and Tc and Tm were not observed.

Examples 1 to 4 The polyimide powder obtained in Synthesis Example 1 and the polycarbonate powder (Panlite L-1225, a trademark of Teijin Kasei Co., Ltd.) were dry blended with various compositions as shown in Table 1, and then the compression ratio was 3 An extruder having a diameter of 40 mm equipped with a 0.0 / 1 screw (processing temperature of 280 to 300 ° C.) was extruded while being melt-kneaded to obtain a uniform blended pellet. Next, the homogeneously blended pellets obtained above are subjected to injection molding at a molding temperature of 300 to 320 ° C. and a mold temperature of 100 ° C. by using an ordinary injection molding machine,
The physical and thermal properties of the molded product were measured. The results are shown in Table 1.
This is shown as Examples 1 to 4. In the table, tensile strength and elongation at break are ASTM D-638, flexural strength and flexural modulus are A
ASTM D-790, heat distortion temperature is ASTM D-64
Based on 8.

Comparative Example 1 Using the composition outside the scope of the present invention, the physical and thermal properties of the molded articles obtained by the same procedure as in Examples 1 to 4 were measured. This is shown as Comparative Example 1. As the content of polycarbonate increases, the minimum injection pressure decreases,
It can be seen that the workability is improved. Further, the mechanical strength and thermophysical properties are not significantly deteriorated by the addition of polycarbonate, and the elongation at break and the flexural modulus are rather improved.

[0031]

[Table 1]

Synthesis Example 2 In place of 2.84 kg of 3,3 ', 4,4'-biphenyltetralbonic acid dianhydride in Synthesis Example 1, 3,3',
4,4'-benzophenonetetralbonic acid dianhydride 3.
A polyimide powder having a logarithmic viscosity of 0.50 dl / g and a glass transition temperature of 197 ° C. was obtained in the same manner as in Synthesis Example 1 except that the reaction was performed using 1 kg (9.65 mol).

Synthesis Example 3 In place of 2.84 kg of 3,3 ', 4,4'-biphenyltetralbonic acid dianhydride in Synthesis Example 1, 4,4'-
(P-Phenylenedioxy) diphthalic acid dianhydride 3.8
A polyimide powder having a logarithmic viscosity of 0.58 dl / g and a glass transition temperature of 171 ° C. was obtained in the same manner as in Synthesis Example 1 except that the reaction was performed using 6 kg (9.6 mol).

Examples 5-10 and Comparative Examples 2-3 Using the polyetherimide powders obtained in Synthesis Examples 2-3,
Uniformly blended pellets were obtained in the same manner as in Examples 1 to 4, then injection-molded in the same manner, and the physical and thermal properties of the molded articles were measured. Results of compositions within the scope of the present invention are shown in Examples 5-10.
In addition, the compositions out of the range are set as Comparative Examples 2 to 3 and are also shown in Table 2.
Shown in.

[0035]

[Table 2]

[0036]

EFFECTS OF THE INVENTION According to the method of the present invention, a polyimide resin composition is provided which has not only excellent properties inherent to polyimide but also excellent moldability.

Claims (1)

[Claims] 1. Basically, formula (1) (formula 1) [In the formula, R is an aliphatic group having 2 or more carbon atoms, a cycloaliphatic group,
Represents a tetravalent group selected from the group consisting of a monocyclic aromatic group, a condensed polycyclic aromatic group, and a non-condensed polycyclic aromatic group in which aromatic groups are connected to each other directly or by a bridging member. . ] The polyimide which has the repeating unit represented by 99.9-50
A resin composition comprising 1% by weight and 0.1 to 50% by weight of polycarbonate.