# US 5,344,869 A · Thermoplastic molding material

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- Number: US 5,344,869 A
- Document ID: US5344869A
- Status: Granted
- Kind: A
- Application number: 07/981,543
- Filed: 1992-11-25
- Granted: 1994-09-06
- Earliest claimed: 1991-11-30
- Assignees: BASF SE
- Inventors: Stefan Seelert; Peter Klaerner; Andreas Jung; Hans Hoenl; Bertram Ostermayer
- Web page: https://patentgrep.com/patent/US5344869A

## CPC

- C08L 25/06: Polystyrene
- C08L 23/02: not modified by chemical after-treatment
- C08L 25/02: Homopolymers or copolymers of hydrocarbons
- C08L 53/025: {modified}
- C08L 53/02: of vinyl-aromatic monomers and conjugated dienes
- Y10S 525/94: Hydrogenation of a polymer
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

Thermoplastic molding materials contain, based in each case on the sum of components A, B and C, A: from 10 to 90% by weight of a polymer A composed of styrene and/or substituted styrene, B: from 10 to 90% by weight of a polyolefin B and C: from 5 to 40% by weight of a star block copolymer C containing not less than 50% by weight of styrene and prepared by anionic polymerization of styrene and butadiene and/or isoprene, coupling and subsequent selective hydrogenation.

## Claims

### Claim 1

A thermoplastic molding material containing, based in each case on the sum of components A, B and C,
A: from 10 to 90% by weight of a polymer A composed of styrene or substituted styrene,
B: from 10 to 90% by weight of a polyolefin B and
C: from 5 to 40% by weight of a star block copolymer C containing not less than 50% by weight of a styrene and prepared by anionic polymerization of styrene and butadiene or isoprene, coupling and subsequent selective hydrogenation, whereby only the double bonds originating from the monomer building blocks of butadiene and/or isoprene are saturated, and not the styrene component, so that more than 50% of the double bonds originally present are saturated.

### Claim 2 (depends on 1)

A molding material as claimed in claim 1, containing, as star block copolymer C, a star block copolymer of from 60 to 90% by weight of styrene and from 40 to 10% by weight of butadiene and having an average number of star branches of from 3 to 12 and a weight average molecular weight M.sub.w (GPC) of from 100,000 to 300,000.

### Claim 3 (depends on 1)

A molding material as claimed in claim 1, containing polyethylene as polyolefin B.

### Claim 4 (depends on 1)

A molding material as claimed in claim 1, containing high density polyethylene (HDPE) as polyolefin B.

### Claim 5 (depends on 1)

A molding material as claimed in claim 1, containing low density polyethylene (LDPE) as polyolefin B.

### Claim 6 (depends on 1)

A molding material as claimed in claim 1, containing linear low density polyethylene (LLDPE) as polyolefin B.

### Claim 7 (depends on 1)

A molding material as claimed in claim 1, containing polypropylene as polyolefin B.

### Claim 8 (depends on 1)

A molding material as claimed in claim 1, containing homopolystyrene as polymer A.

### Claim 9 (depends on 1)

A molding material as claimed in claim 1, containing a star block copolymer C having a degree of hydrogenation of more than 80%.

### Claim 10 (depends on 1)

A molding material as claimed in claim 1, containing from 30 to 70% by weight each of A and B.

### Claim 11 (depends on 1)

A molding material as claimed in claim 1, containing from 0.05 to 50 parts by weight of conventional additives (component D) per 100 parts by weight of A+B+C.

### Claim 12 (depends on 1)

A method of using a molding material as claimed in claim 1 for the production of moldings.