# US 4,393,164 A · Transparent impact-resistant molding material

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- Number: US 4,393,164 A
- Document ID: US4393164A
- Status: Granted
- Kind: A
- Application number: 06/362,407
- Filed: 1982-03-26
- Granted: 1983-07-12
- Earliest claimed: 1981-04-04
- Assignees: BASF SE
- Inventors: Graham E. McKee; Franz Haaf; Juergen Hambrecht; Klaus Benker; Rudolf Stephan; Hans Breuer
- Web page: https://patentgrep.com/patent/US4393164A

## CPC

- C08L 25/12: with unsaturated nitriles
- C08L 33/12: Homopolymers or copolymers of methyl methacrylate
- C08L 51/04: grafted on to rubbers
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Transparent, impact-resistant thermoplastic molding materials produced from a rigid methylmethacrylate polymer A, a rigid styrene-acrylonitrile polymer B and a flexible graft copolymer C, made from grafting an alkylmethacrylate and optionally styrene onto a rubber grafting base.

## Claims

### Claim 1

Transparent, impact resistant molding material which can be processed above 200.degree. C. without recognizable yellowing and odor development, consisting of a mixture of
(A) 15 to 70 parts by weight of a methylmethacrylate polymer containing 90 to 100 percent by weight of a methylmethacrylate and 10 to 0 percent by weight of an alkylacrylate having 1 carbon atom to 8 carbon atoms in the alkyl radical,
(B) 10 to 50 parts by weight of a styrene/acrylonitrile copolymer containing 78 to 88 parts by weight styrene and 22 to 12 parts by weight acrylonitrile,
(C) 20 to 50 parts by weight of a copolymerized graft polymer mixture and
(D) additives in an amount from 0 to 20 percent by weight relative to the total of components A, B and C wherein the parts by weight of A, B and C total 100 and where the difference between the refractory index of component C and the refractive index of the mixture of components A, B and D is less than 0.005,
wherein the copolymerized graft polymer mixture C is produced by grafting
(C.sub.1) 50 to 80 percent by weight relative to the copolymerized graft polymer C of a diene elastomeric grafting base having a glass temperature below -20.degree. C. with
(C.sub.2) 20 to 50 percent by weight consisting of of the following components as a mixture or in sequence:
(C.sub.21) 40 to 100 parts by weight of one or more methacrylates of C.sub.1 -C.sub.8 alkanols and
(C.sub.22) 0 to 60 parts by weight of styrene or an alkylstyrene having up to 12 carbon atoms.

### Claim 2 (depends on 1)

The molding materials of claim 1 wherein components A, B, C and D are mixed while molten.

### Claim 3 (depends on 1)

The molding materials of claim 1 wherein the elastomeric graft base C.sub.1 consists of a cross-linked copolymer of the following components:
(C.sub.11) 60 to 90 parts by weight of butadiene or isoprene and
(C.sub.12) 10 to 40 parts by weight of styrene or an alkylstyrene having up to 12 carbon atoms.

### Claim 4 (depends on 1, 2, 3)

A molded part made from the molding material of any one of claims 1 through 3.