# US 4,393,161 A · High impact, high modulus reinforced aromatic carbonate polymeric mixtures

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- Number: US 4,393,161 A
- Document ID: US4393161A
- Status: Granted
- Kind: A
- Application number: 06/281,710
- Filed: 1981-07-09
- Granted: 1983-07-12
- Earliest claimed: 1981-07-09
- Assignees: General Electric Company
- Inventors: Petrus C. A. M. Van Abeelen; Hans de Munck
- Web page: https://patentgrep.com/patent/US4393161A

## CPC

- C08L 25/06: Polystyrene
- C08K 7/02: Fibres or whiskers
- C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates
- C08L 69/005: {Polyester-carbonates}
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

High impact, high modulus thermoplastic molding compositions comprise (a) an aromatic carbonate polymer; (b) a polystyrene resin; (c) a fibrous reinforcing agent essentially free of any sizing agent; and (d) a small amount of a polysiloxane having a substantial content of Si--H bonds.

## Claims

### Claim 1

A high impact strength, high modulus thermoplastic composition comprising an intimate admixture of:
(a) an aromatic carbonate polymer or copolymer;
(b) a polystyrene resin, the total weight of (a) plus (b) being from about 35 to about 95 parts of the composition;
(c) from about 5 to about 65 parts by weight of a pristine fibrous reinforcing agent; and
(d) from about 0.05 to about 4 parts by weight of a hydrogen siloxane comprising units of the formula: ##STR3## wherein R is hydrogen, C.sub.1 -C.sub.10 alkyl, phenyl or a mixture thereof, and n plus m is at least about 4.

### Claim 2 (depends on 1)

The composition of claim 1 wherein the siloxane is present in an amount of from about 0.05 to less than 0.5 parts by weight per 100 parts by weight of the total composition.

### Claim 3 (depends on 1)

The composition of claim 1 wherein the aromatic carbonate polymer is the reaction product of 2,2-bis(hydroxyphenyl)propane and phosgene.

### Claim 4 (depends on 1)

The composition of claim 1 wherein the aromatic carbonate is the reaction product of 2,2-bis(hydroxy-3,5-dimethylphenyl)propane and phosgene.

### Claim 5 (depends on 1)

The composition of claim 1 wherein the fibrous reinforcing agent comprises glass fibers or rockwool fibers.

### Claim 6 (depends on 1)

The composition of claim 1 wherein the polystyrene resin is a polystyrene-acrylonitrile copolymer.

### Claim 7

A high impact strength, high modulus thermoplastic composition consisting essentially of an intimate admixture of:
(a) an aromatic carbonate polymer or copolymer;
(b) a polystyrene resin, the total weight of (a) plus (b) being from about 35 to about 95 parts of the composition;
(c) from about 5 to about 65 parts by weight of a pristine fibrous reinforcing agent; and
(d) from about 0.05 to about 4 parts by weight of a hydrogen siloxane comprising units of the formula: ##STR4## wherein R is hydrogen, C.sub.1 -C.sub.10 alkyl, phenyl or a mixture thereof, and n plus m is at least about 4.