# US 2002/0004558 A1 · Novel thermoplastic elastomer composition with superior oil resistance

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- Number: US 2002/0004558 A1
- Document ID: US20020004558A1
- Status: Published application
- Kind: A1
- Application number: 09/085,354
- Filed: 1998-05-27
- Published: 2002-01-10
- Earliest claimed: 1997-11-28
- Assignees: Asahi Kasei Kogyo Kabushiki Kaisha; Optatech Corporation
- Inventors: TETSUO MASUBUCHI
- Web page: https://patentgrep.com/patent/US20020004558A1

## CPC

- C08L 23/10: Homopolymers or copolymers of propene
- C08L 53/025: {modified}
- C08L 33/08: Homopolymers or copolymers of acrylic acid esters
- C08L 53/02: of vinyl-aromatic monomers and conjugated dienes
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The present invention relates to a novel thermoplastic elastomer composition with superior oil resistance along with elastomeric flexibility, creep resistance at high temperature, superior mechanical strength and moldability. The composition comprises (a) 100 parts by weight of a hydrogenated block copolymer obtained by hydrogenating a block copolymer comprising at least two A polymer blocks comprised mainly of a vinyl aromatic compound and at least one B polymer block comprised mainly of a conjugated diene compound; and (b) 30-300 parts by weight of a partially crosslinked thermoplastic elastomer obtained by polymerizing an acrylate monomer absorbed in a polyolefin. The novel composition can be applied as a material for various molded parts.

## Claims

### Claim 1

A thermoplastic elastomer composition, characterized in that it is obtainable by melt blending of a compound comprising:
(a) 100 parts by weight of a hydrogenated block copolymer obtained by hydrogenating a block copolymer comprising at least two A polymer blocks comprised mainly of a vinyl aromatic compound and at least one B polymer block comprised mainly of a conjugated diene compound; and
(b) 30-300 parts by weight of a partially crosslinked thermoplastic elastomer obtained by polymerizing an acrylate monomer absorbed in a polyolefin.

### Claim 2

A thermoplastic elastomer composition, characterized in that it is obtainable by melt blending of a compound comprising:
(a) 100 parts by weight of a hydrogenated block copolymer obtained by hydrogenating a block copolymer comprising at least two A polymer blocks comprised mainly of a vinyl aromatic compound and at least one B polymer block comprised mainly of a conjugated diene compound;
(b) 30-300 parts by weight of a partially crosslinked thermoplastic elastomer obtained by polymerizing an acrylate monomer absorbed in a polyolefin.
(c) 40-300 parts by weight of non-aromatic rubber use oil; and
(d) 5-70 parts by weight of polyolefin resin.

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

The thermoplastic elastomer composition according to claims 1 and 2, wherein said vinyl aromatic compound is styrene and said conjugated diene compound is butadiene or isoprene.

### Claim 4 (depends on 2)

The thermoplastic elastomer composition according to claim 2, wherein said polyolefin resin is a propylene homopolymer and/or a copolymer of propylene with ethylene or C4-C8 α-olefin.

### Claim 5 (depends on 2)

The thermoplastic elastomer composition according to claim 2, wherein said non-aromatic rubber use oil is a oil with dynamic viscosity at 40° C. of 20-800 cSt, fluidity point of 0 . . . −40° C. and flash point of 200-400° C.