DE2839356A1 - COMPOSITION OF A POLYCARBONATE RESIN AND A SELECTIVELY HYDROGENATED BLOCK COPOLYMER OF A VINYL-AROMATIC COMPOUND AND AN OLEFINIC ELASTOMER - Google Patents

Description

Composition of a polycarbonate resin and a selective hydrogenated block copolymers of a vinyl aromatic compound and an olefinic elastomer

The invention relates to new resin compositions, and more particularly Polymer compositions containing an aromatic polycarbonate resin and a selectively hydrogenated elastomeric block copolymer of a vinyl aromatic compound and an olefinic one Elastomers alone or in further combination with additives such as reinforcing agents, foaming agents, Contain pigments and flame retardants.

Aromatic carbonate polymers are well known commercially available materials that are widely used in the plastics art of uses. Such carbonate polymers can be produced by reacting a dihydric phenol such as 2,2-bis- (4-hydroxyphenyl) propane, with a carbonate precursor, such as phosgene, in the presence of an acid-binding agent. In this context, reference taken on "Encyclopedia of Polymer Science and Technology"

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Vol. 10, pages 710 to 764, published by Interscience, New York, 1969. The disclosure of this publication is made by this reference is incorporated in the present application in its entirety.

Generally speaking, the aromatic polycarbonate resins provide high resistance to mineral acids and they are physiologically harmless and color-fast. Continue to have Articles molded from such polymers / high tensile strength and high impact resistance, except in thick parts, high heat resistance and dimensional stability that most other thermoplastic ! Materials far superior. In certain applications, however, the use of the aromatic polycarbonate resins is limited, because I) the same have a high melt viscosity, the molding of complicated, large and in particular makes foamed parts difficult;

II) have the same brittleness under severe impact conditions in thick parts and regardless of the thickness when a small amount of reinforcing agent, for example glass or Pigments such as titanium dioxide are added for usual purposes; and

III) they show severe hairline cracks and cracks under external stress.

The term hairline cracks and cracks under external stress refers to a special type of defect caused by the presence of organic solvents, for example Acetone, heptane and carbon tetrachloride is accelerated when such solvents are in contact with the claimed Parts made from the aromatic polycarbonate resins stand. Such a contact can for example occur when the solvents are used to clean the stressed parts made from the polycarbonates or to degrease or when such parts are used in automobiles, especially under the hood.

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The relatively high melt viscosities and softening points of the aromatic polycarbonates do the same for the melting process difficult to handle and various proposals for improving the melt flow have been made, wherein however, the same had disadvantages. For example Plasticizers are added, but other properties are lost, the parts become brittle and lose one substantial amount of their heat distortion resistance. There on the other hand it has already been suggested in US Pat. No. 3,431,224 that small amounts of polyethylene can be added, although it considerably increases the resistance to crazing and cracking caused by external influences, yet small amounts of polyethylene are not too effective in increasing the melt flow and increasing the additive in effective areas results in the molded articles delaminating.

It has now been found that the addition of a small amount of a hydrogenated block copolymer to aromatic polycarbonates a drop in melt viscosity causes the heat distortion temperature to remain essentially unaffected.

From a practical point of view, the melt flow length becomes / under standard conditions Molded parts are significantly enlarged by 2, 5, 10 and 20% added block copolymer and large foamed parts Parts that are particularly difficult to use with unmodified polycarbonate are easily made. The results are surprising because aromatic polycarbonates are themselves high Have viscosities that are not very dependent on the shear rate; Block copolymers also have high melt viscosity, however, they are very dependent on the shear rate, while after the two are mixed together a very substantial reduction the melt viscosity obtained is below the value of the individual components. As mentioned earlier, are hydrogenated Block copolymers of the kind as defined, uniquely suitable for this application because 5% of a hydrogenated block copolymer the melt flow improves up to 45%, while 4% poly-

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- ο -

Ethylene the melt flow of the aromatic polycarbonate at 300 ⁰ C to 13% only improved, so that can be used substantially smaller amounts of the hydrogenated block copolymer.

The second major benefit in the addition of hydrogenated block copolymers to polycarbonates lies in the improvement of the impact resistance in the case of thick-walled molded objects. Normally Thick-walled workpieces formed from aromatic polycarbonates are brittle even if they are made of a resin are made, which is completely satisfactory with thin walls. For example, the notched Izod impact strength drops a 0.32 cm (1/8 ") thick sample of 76 kg / cm (16 ft. lbs./in.) when the sample thickness is doubled to 0.64 cm (1/4 in.) To 14 kg / cm (2.5 ft.lbs.). Polyolefins as described in in the aforementioned U.S. Patent 3,431,224 improve the situation somewhat, but their use is due the tendency to delamination is limited to 3% and in any case the impact strength can only be reduced to about 33 kg / cm at 0.64 cm (1/4 in.) Samples are increased by the polyethylene. Surprisingly enough it has now been found that only 3% by weight of a hydrogenated block copolymer is capable of reducing the impact strength a 0.64 cm (1/4 in.) thick sample from 14 kg / cm to about 59.9 kg / cm (11 ft. lbs./in.), which is the value for a thin-walled unmodified polycarbonate comes close.

The third major advantage of adding the hydrogenated block copolymers to the polycarbonates is to improve their resistance to environmental influences. The molded Parts can therefore be subjected to greater elongation before fracture begins without others desirable properties are markedly impaired. Although U.S. Patent 3,431,224 discloses that polyolefins and other resins are useful for this purpose, and German patent publication 2,329,585 the addition of rubbery, random polymers and copolymers disclosed, in order to reduce certain properties of the aromatic polycarbonates

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better, it was with respect to the hydrogenated block copolymers found that the same are excellent and uniquely suitable for the time to the breaking load of the parts under Elongation, for example by immersion in aggressive solvents such as gasoline and carbon tetrachloride, can be measured extend. All of the publications and patents discussed in this application are incorporated herein by reference incorporated into the present application.

The new compositions can also be reinforced, for example with fibrous glass, and by using a halogenated aromatic polycarbonate in its entirety or be made flame-retardant as part of component (a) and / or by using flame-retardant additives, or they can be pigmented and / or shaped according to known processes, so that their field of application in the in the melt processed products.

In comparison to the known compositions, the compositions according to the invention have Products also have high rigidity and strength, excellent surface appearance and excellent Resistance to discoloration from heat.

According to the present invention, high-impact, thermoplastic compositions created which contain in intimate mixture:

(a) an aromatic polycarbonate resin with

(b) a selectively hydrogenated linear, regular or radial Teleblock copolymers from a polymerized vinyl aromatic compound (A) and (A) and one

η j γι

olefinic elastomers (B) from A -BA -, A - (bAB) A ~, A _n - (BA) _n Br (A) ₄ B, - B (A) ζ or B / ~ (AB) _n B_7 ₄ - Jtype where η represents an integer from 1 to 10.

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Preferred compositions are those in which _r Component V 'il .- (a) from 99.5 to 50 parts by weight and the component (b) from 0.5 to 50 parts by weight of the total weight of components (a) and (b) includes. In particularly preferred compositions, component (a) comprises 99.5 to 90 parts by weight and component (b) comprises 0.5 to 10 parts by weight of the total weight of components (a) and (b).

In preferred compositions, the aromatic polycarbonate is bostandii (a) an aromatic polycarbonate made from a dihydric pheno] and a carbonate precursor, such as phos-gen, a Ualogonformate or a carbonate ester. Generally speaking can such carbonate polymers by the following repeating Structural units of the formula

O
4-0-AOC

can be characterized in whichÄ is a divalent aromatic

of.
Represents the remainder / xn of the dihydric phenol used in the polymer formation reaction. Preferably, the carbonate polymers have an intrinsic viscosity (measured in p-dioxane in dl / g at 30 ⁰ C) in the range of about 0.35 to about 0.75. The dihydric phenols which can be used to create such aromatic carbonate polymers are mononuclear and polynuclear aromatic compounds which contain, as functional groups, two hydroxyl radicals, each of which is bonded directly to a carbon atom of an aromatic nucleus. Examples of such dihydric phenols are: 2,2-bis- (4-hydroxyphenyl) -propane, (bisphenol-A), resorcinol, bis- (4-hydroxy-5-nitrophenyl) -methane, 2,2'-dihydroxydiphenyl , 2,6-dihydroxynaphthalene, bis- (4-hydroxyphenyl sulfone), 5'-chloro-2,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxydiphenyl ether and 4,4'-dihydroxy-2,5-diethoxydiphenyl ether.

A variety of other dihydric phenols that can be used to create such carbonate polymers are included in US Pat U.S. Patent 2,999,835. It goes without saying

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knows, two or more different dihydric phenols or a dihydric phenol in combination with a glycol, a hydroxy-terminating polyester or a dibasic acid in the Case in which a carbonate copolymer instead of a homopolymer for the use as component (a) in the composition according to the invention it is desired to use, for example, bisphenol-A and tetrabromobisphenol-A with flammhenunendoii egg shells.

As for the component (b), the hydrogenated BLock copolymers manufactured by known methods and they are commercially available. Before hydrogenation, embrace the emiblock of these copolymers homopolymers or copolymers, preferably of alkenyl aromatic hydrocarbons and in particular vinyl aromatic hydrocarbons have been prepared in which the aromatic moiety is either monocyclic or is polycyclic. Typical monomers include styrene, OC-methylstyrene, vinyltoluene, vinylxylene, ethylvinylxylene and Vinyl naphthalene, especially styrene, or mixtures thereof. The end blocks (A) and (A) can be the same or different be. The central block (B) can be derived from, for example, butadiene, isoprene, 1,3-pentadiene and 2,3-dimethylbutadiene and it can have a linear, regular or teleradialo structure own.

The selectively hydrogenated linear block copolymers are described in U.S. Patent 3,333,024.

The ratio of the copolymers and the average moles Molecular weights can vary within wide limits, although the molecular weight of the central block can be greater should as the same as the united end-blocks. It is preferred to have end blocks A with average molecular weights

is

from 2000 to 100,000 and the central block B / for example a hydrogenated polybutadiene block having an average molecular weight of 25,000 to 1,000,000. It still will

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more preferred if the end blocks have average molecular weights from 8,000 to 60,000 while the hydrogenated polybutadiene polymer blocks have an average molecular weight have 50,000 and 300,000. The end blocks preferably comprise 2 to 60% by weight or more, preferably 15 to 40 percent by weight of the total block polymer. The preferred Copolymers are those that are formed from a copolymer with a hydrogenated / saturated polybutadiene central block, wherein 5 to 55% or more, preferably 30 to 50%, of the butadlene carbon atoms Vinyl side chains are.

The hydrogenated copolymers have average unsaturation less than 20% of the original value. It is preferred to set the unsaturation of the central block B to 10% or less, preferably to 5% of its original value.

The block copolymers are made according to the techniques known to those skilled in the art manufactured. The hydrogenation can be carried out using a variety of hydrogenation catalysts, such as nickel or kieselguhr, Raney nickel, copper chromate, molybdenum sulfide and finely divided Platinum or other precious metals can be carried out on the surface zone of a support.

The hydrogenation can be at any desired temperature or pressure from atmospheric pressure to 21 kg / cm * (300 psig), with the usual range between 7 kg / cm ² and 70 kg / cm ² at temperatures of be 24 ° C to 315 ° C (75 ° F to 600 ⁰ F), corresponding to the reaction times of from 0.1 to 24 hours, preferably 0.2 to 8 hours.

The hydrogenated block copolymers, such as Kraton G-6500, Kraton G-6521, Shell Chemical Kraton G-1650 and Draton G-1652 Company, Polymer Division have made the present invention

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found to be useful. Kraton G-1650 is preferred. Also useful are the so-called hydrogenated solprenes from Phillips, especially the product with the name Solprene-512.

The radial teleblock copolymers, of which the Solrirene are typical Examples can be characterized by having at least 3 polymer branches, each Branch of radial block polymer terminal non-elastomeric

w, eise ι contains segments, for example y (A) and (A), as described above are defined. The branches of the radial block polymers contain a terminal non-elastomeric segment which is attached to a elastomeric polymer segment is bound, for example (B), as defined above. They are described in U.S. Patents 3,753,936 and 3,281,383 and are selective hydrogenated by processes known per se, the term "selective Hydrogenation "is used herein to envisage polymers in which the elastomeric blocks (B) are hydrogenated, however, the non-elastomeric blocks are not hydrogenated, i.e. left aromatic.

but not the non-elastomeric blocks (A) and (A), the un-

As mentioned above, other additives can be included in the compositions such as pigments, e.g. titanium dioxide, flame retardants and foaming agents, e.g. 5-phenyltetrazole, in amounts ranging from about 0.1 to 100 parts by weight of the total resinous compositions (a) and (b) included in the composition.

Among the preferred features of the present invention are fortified compositions which contain fortifying Amounts of reinforcing agents, such as powders, whiskers, fibers or flakes of metals, for example, aluminum, bronze, Iron or nickel and non-metals, for example carbon filaments, acicular calcium silicate, asbestos, SiO 2, titanate whiskers and glass flakes included. Such reinforcing agents

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are in amounts of, for example, 2 to 60% by weight, preferably 5 to 40 weight percent present. As a reinforcing agent is used fibrous Glass is particularly preferred.

The method of making the polymer composition is not critical. In general, any known mixing technique is suitable. The preferred method involves blending the polymers and additives such as reinforcing agents in powder, Granular and filamentary form - as is the case in each case, the extrusion of the mixture and the grinding into pellets, which are suitable for molding by conventionally used processes, so as to normally solid, thermoplastic ones To give compositions.

The benefits obtained by creating compositions of an aromatic polycarbonate resin and a selectively hydrogenated, elastomeric vinyl aromatic olefinic A-B-A block copolymer are illustrated in detail by the following examples, which, however, are merely illustrative of the invention, but in no way are used to limit the invention.

The following formulations were prepared by a general process technique, which comprises mechanically mixing the components and then 4-hour pre-drying at 125 ⁰ C and then extruding in a twin-screw extruder of Werner and Pfleiderer (WP) at 300 ⁰ C. After extrusion, the materials were dried for 4 hours at 125 ⁰ C, before they were formed into a reciprocating screw injection molding machine at 260 to 320 ⁰ C (cylinder temperature) and 20 to 115 ° C (mold temperature} into test pieces. In order to produce foamable compositions , / Pelletized extrudate was mixed with 5-phenyltetrazole at 0.25 parts per 100 parts of (a) and (b) / The foaming molding is carried out in a Siemag unit with a plasticizer / collector. All conditions are standard for polycarbonates.

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All of the polycarbonate ingredients contained a small amount, for example 0.1%, of a stabilizer combination, ie conventional phosphite / hindered phenol. The physical tests were performed using the following procedures: Tzod impact strength on 0.64 cm and 0.32 cm thick samples; "falling dart ¹¹ impact strength tests with 0.32 cm thick disk-shaped samples; tensile strength and modulus, flexural strength and modulus, heat deformation temperature; apparent melt viscosity at 1500 sec." and 300 ⁰ G and in the case of foams Gardner impact strength and Charpy impact strength. The compositions prepared and the physical properties of the molded pieces were as follows:

example 1

A composition was made, shaped and tested,

Example 1 1A *

Composition (parts by weight)

(a) poly (2,2-diphenylpropane) -

carbonate ^a 97 100

(b) hydrogenated styrene-butadiene-styrene block copolymer 3

properties

Intrinsic viscosity dl / g 0.62 0.56

Notched Izod Impact Strength (0.32 cm) kg / cm

(0.64 cm) kg / cm

"Falling dart" impact resistance kg / m

Tensile strength kgf / cm ² tensile modulus kgf / cm ²

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71 76 60 14th ; · 20 / 20 580 630 23,600 24,300

Continuation of the table

^T ? EisDiel 1 1Λ *

Flexural strength kgf / cn ² : Aegemodule kgf / cm ²

III tzeverf οrm.ung temperature door at 18.5 kg / cm ² ,

Melt viscosity (poise)

910 23 950 22nd 700 .900 139 3 140 2. 900 .900

* Control attempt

a General Electric Company, Lexan 160 (approximate molecular weight) b Shell Chemical Company, Kraton G-1650

From the above, it can be seen that the melt viscosity is quite is considerably decreased and the impact resistance of the thick part is substantially improved without loss of others Properties in the composition of Example 1 occurs.

Example 2

A composition with an aromatic polycarbonate with a higher molecular weight was prepared:

Example 2 2A *

Composition (parts by weight)

(a) poly (2,2-diphenylpropane) -

carbonate ^a 95 100

(b) Hydrogenated styrene-butadiene-styrene block copolymer 5

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- IS -

Continuation of the table

Example 2 27v *

properties

Intrinsic viscosity dl / g 0.59 0.59

Izod impact strength text
(0.32 cm) kg / cm
(0.64 cm) kg / cm 71
60 7 6
14th "Palling Dart" impact resistance
kg / m > 20 > 20 Tensile strength kgf / cm * 560 630 Tensile modulus kgf / cm ² 22,500 24.3 00 Flexural strength kgf / cm ² 900 950 Flexural modulus kgf / cm * 22,000 23,900 Deformation temperature
at 18.5 kg / cm ² , ⁰ ° C 138 14 0 Melt viscosity (poises) 2,200 ^r > .000

* Control attempt

a General Electric Company Lexan 100 (approximate molecule i aiyewicbt) b Shell Chemical Company, Kraton 0-1650

A noticeable one results from the foregoing; reduction the melt viscosity and an increase in the impact strength of the thicker parts.

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BATH ORIGINAL

Game 3

A glass reinforced composition was prepared and tested:

Example 3 3A *

Composition (parts by weight)

(a) PcIy- (2,2-diphenylpropane) -

carbonate ^d 90 9 5

(b) hydrogenated styrene butadiene

Styrene copolymer ^y 5 -

(c) Fibrous glass strengthener 5 5

Features

Intrinsic viscosity dl / g 0.57 0.57

Notched Izod Impact Strength (Q, 32 cm) kg / cm

(0.64 cm) kg / cm

"Falling dart" impact strength kg / m

Tensile strength kgf / cm ² tensile modulus kgf / cm ² flexural strength kgf / cm ² flexural modulus kgf / cm ²

Heat distortion temperature at 18.5 kg cm ² , ⁰ C

Melt viscosity (poises)

37 29 14th 22nd 14th V 20 27 19th 610 635 28,000 4th .000 940 990 25,000 .000 140 140 2,000 .800

* Check! Try a General Electric Co., Lexan b Shell Chemical Co., Kraton G-1650

Not only are the flow properties noticeably improved, but also the serious embrittlement effect of the glass the reverse is true for both thick and thin walls.

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Example 4

A pigmented composition was made and tested:

Example 4 4Λ *

Composition (parts by weight)

(a) poly (2,2-diphenylpropane) -

carbonate 95 98

(b) hydrogenated styrene-butadiene.
Styrene block copolymer 3

(c) pigment, titanium dioxide 2 2

properties

intrinsic viscosity dl / g 0.57 0.57

Notched Izod Impact Strength (0.32 cm) kg / cm)

(0.64 cm) kg / cm

"Falling dart" impact resistance kg / cm

Tensile strength kgf / cm ² tensile modulus kgf / cm ²

Heat shaping temperature at 18.5 kg / cm ² , ⁰ G

Melt viscosity (poises)

73 24 14th 19th 14th ■ -20 4th / 20 615 635 23 .800 .500 138 140 2 .900 .500

* Control run a General Electric Co. Lexan b Shell Chemical Co., Kraton G-1650

The effective properties and the impact resistance are improved, without any loss of the other important properties.

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Example 5

Ea became a reinforced, flame retardant, foamed composition manufactured, molded and tested:

J> t iispie.l 5 5A *

(Parts by weight)

{·;) Poly- (2, 2-dipheny! .Propane) -

carbonate ⁿ 90 95

(L) hydrogenated styrene butadiene

Styrene block copolymer 5

(c) Glass fiber reinforcing agent · 5 5

(<?.) sodium salt of trichlorobenzene

sulfons. '.' ure, flame retardant 0.8 0.8

(e) 5-phenyltetrazole foaming agent x 0.25 0.25 properties

intrinsic viscosity dl / g tensile strength kgf / cm ² tensile modulus kgf / cm ² flexural strength kgf / cm ² flexural modulus kgf / cm ²

Heat deformation temperature 18.5 kg / cm ² , ⁰ C

Melt viscosity (poise)
Gardner impact resistance in.ibs.
Charpy impact strength kgfcm / cm ² no break

0 .59 17, 0 , 59 316 320 14th 700 20th .000 570 610 17th 900 4th .000 126 126 3. 000 .000 200 105 no fracture no fracture

* Control run a General Electric Co., Lexan b Shell Chemical Co. Kraton G-1650

Because of the improved processability, large parts, for example from 3 to 4 kg in weight with an optimum density of 0.7 to 0.9 g / cm ^{3, can be} foamed from the composition according to the invention and they have surfaces with outstanding gloss.

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Typical properties for building material foams are long swelling times and high temperatures, which are necessary for the flow requirements. « are. This leads accordingly to serious technical problems caused by a polymer combination brew, when the chemical blowing agents are present. D. The example of the present invention overcomes this difficulty. ten in every way.

Examples 6 to 9

A number of compositions were produced and shaped and the cracks occurring as a result of external stress under a bending load of 0.25 % elongation after immersion in carbon tetrachloride were determined by methods known per se.

Example 6A *

(a) Poly (2,2-diphenylpropanecarbonate ϊ ^a 100

(b) poly (2,2-diphenylpropanecarbonate)

95

100

9 5

(c) hydrogenated styrene
Butadiene styrene
Block copolymer ⁰ - _ 2 5 _ 2 4th properties Start of cracking
after 31
Sec. 45
Sec. 2
Min. 45
Sec. Min. > 12
Min

catastrophic cracking after

1 na> w

Min. Min. Min.

50> 12> 12 sec. Min »Min.

* Control! Attempt

a General Electric Co., Lexan 121
b General Electric co. _r Lexan 101
c Shell Chemical Co., Kraton G-1650

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iAD OWQIMAL

The compositions according to the present invention show a substantial improvement in crack resistance under stress.

In another test, tensile strength bars were molded from each of the compositions 6 and 6A in accordance with the DIN standard and below left constant deformation of 2.8% for 24 hours. Sample 6Λ showed many cracks, while in example 1 no cracking occurred, whereby the outstanding resistance in relation to the relaxation stress in the air environment emerges.

Example 10

A composition according to Example 1 (97 parts of poly ( 2,2-diphenylpropane) carbonate and 3% hydrogenated (styrene-butadiene-styrene block copolymer) was molded into 0.32 cm thick disks and subjected to the "Falling Dart" impact test The disks were then subjected to the external stress crack resistance test with the following results:

immersed in

Carbon tetrachloride gasoline (super petrol)

effect

no breakage, only minor hairline cracks after long immersion times

no breakage, essentially no hairline cracks, even after very long ones Immersion times

Example 11

A flame retardant, foamed, glass reinforced composition according to Example 5, test sticks were formed, immersed in petrol (super petrol) and the maximum flexural strength as a function the time up to 50 min. and compared with that of rods made from foamed polycarbonate control samples had been. Initially, both bars had a maximum

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male flexural strength of 560 kgf / cm ² . The control rod dropped to 100 kgf / cm ² within 2 minutes and stabilized at this value. The composition according to the present invention slowly fell to 250 kgf / cm ² over 20 minutes and did not fall below this value until after an immersion time of 50 minutes.

From the above data it can be seen that the addition of the block copolymers to the aromatic polycarbonates increases the extensibility promotes the embrittlement deformation instead of thick-walled bodies to increase.

The same beneficial improvement in elongation deformation is obtained with pigmented and glass reinforcing agents Achieved compositions notorious for their embrittlement of aromatic polycarbonates.

Flame retardant modifications were also made that are not brittle and have superior properties when foamed.

The resistance to breakage under external stress has been drastically improved for both solids and foams.

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Claims (10)

Claims 1) thermoplastic composition, characterized in that it contains in an intimate mixture: (a) an aromatic polycarbonate resin with (b) a selectively hydrogenated linear, sequential or radial teleblock copolymer of a polymerized vinyl aromatic compound (A) and (A) and an olefinic elastomer (B) from A -B-A-; A (B-A-B) -A-; η η η η η _ Bf (A) ₄ B-; B (A) j; or B / TAB) _n B_7 ₄ ~ type, where η is a represents an integer from 1 to 10. 2) Composition according to claim 1, characterized in that the component (a) 99.5 to 50 parts by weight and the component (b) 0.5 to 50 parts by weight of the total weight of the ingredients (a) and (b). 3) Composition according to claim 2, characterized in that the component (a) 99.5 to 90 parts by weight and the component (b) 0.5 to 10 parts by weight of the total weight of (a) and (b) includes. 909812/0939 4) Composition according to any one of the preceding claims, characterized characterized in that the aromatic polycarbonate is a bisphenol-A polycarbonate. 5) Composition according to one of the preceding claims, da- the ι characterized in that in / component (b) (A) and (A) is selected from styrene, d. -Methylstyrene, vinyltoluene, vinylxylene and vinylnaphthalene and (B) is selected from polymerized butadiene, isoprene, 1,3-pentadiene or 2,3-dimethylbutadiene. 6) Composition according to claim 5, characterized in that at the component (b) (A) and (A) are styrene blocks. 7) Composition according to claim 6, characterized in that in component (b) the end blocks (A) and (A), respectively Have molecular weights of 2,000 to 100,000 and the central block (B) has a molecular weight of 25,000 to 1,000 owns. 8) Reinforced composition according to any one of the preceding claims, characterized in that it further contains a reinforced filler. 9) Composition according to any one of the preceding claims characterized in that it further comprises a flame retardant agent. 10) Composition according to any one of the preceding claims, characterized characterized in that it further comprises a foaming agent. 909812/0933