# US 5,708,083 A · Propylene polymer ethylene/olefin rubber and polyethylene block copolymer

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- Number: US 5,708,083 A
- Document ID: US5708083A
- Status: Granted
- Kind: A
- Application number: 08/799,988
- Filed: 1997-02-13
- Granted: 1998-01-13
- Earliest claimed: 1994-08-02
- Inventors: Takanobu Kawamura; Katsuhiko Ohno; Osamu Kojima; Kouichi Hatada; Shinei Gima; Takao Nomura; Takeyoshi Nishio
- Web page: https://patentgrep.com/patent/US5708083A

## CPC

- C08L 23/10: Homopolymers or copolymers of propene
- C08L 23/12: Polypropene
- C08L 23/142: {at least partially crystalline copolymers of propene with other olefins}
- C08L 53/00: Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2205/035: containing four or more polymers in a blend
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A polyolefin resin composition is disclosed which comprises (a) a crystalline propylene polymer in an amount of 40% or more to less than 95% by weight, (b) an ethylene/.alpha.-olefin rubber in an amount of from 5 to 40% by weight, and (c) a linear or branched specified block copolymer in an amount of from 0.1 to 20% by weight containing a polyethylene block segment A having a melting temperature as measured with a differential scanning calorimeter of from 80.degree. to 120.degree. C. and an ethylene/.alpha.-olefin copolymer block segment B, the total content of components (a), (b), and (c) being 100% by weight, which composition has excellent dispersibility of the rubber used, so that moldings having an excellent balance between rigidity and impact resistance are obtained therefrom, and is hence suitable for use in the field of moldings required to have rigidity and impact resistance.

## Claims

### Claim 1

A polyolefin resin composition comprising
(a) a crystalline propylene polymer in an amount of 40% or more to less than 95% by weight,
(b) a particulate ethylene/.alpha.-olefin rubber in an amount of from 5 to 40% by weight, and
(c) a linear or branched specified block copolymer in an amount of from 0.1 to 20% by weight containing a polyethylene block segment A having a melting temperature as measured with a differential scanning calorimeter of from 80.degree. to 120.degree. C. and an ethylene/.alpha.-olefin copolymer block segment B,
the total content of components (a), (b), and (c) being 100% by weight.

### Claim 2 (depends on 1)

The polyolefin resin composition as claimed in claim 1, wherein the crystalline propylene polymer (a) is at least one member selected from the group consisting of a crystalline propylene homopolymer and a crystalline propylene/ethylene block copolymer.

### Claim 3 (depends on 1)

The polyolefin resin composition as claimed in claim 1, wherein the ethylene/.alpha.-olefin rubber (b) is at least one member selected from the group consisting of an ethylene/propylene rubber and an ethylene/butene-1 rubber.

### Claim 4 (depends on 1)

The polyolefin resin composition as claimed in claim 1, wherein the ethylene/.alpha.-olefin block segment B is at least one member selected from the group consisting of an ethylene/butene copolymer and an ethylene/propylene copolymer.

### Claim 5 (depends on 1)

The polyolefin resin composition as claimed in claim 1 wherein said copolymer block segment B is an ethylene/butene copolymer.

### Claim 6 (depends on 1)

The polyolefin resin composition as claimed in claim 1 wherein said copolymer block segment B is an ethylene/propylene copolymer.

### Claim 7 (depends on 5)

The polyolefin resin composition as claimed in claim 5 wherein the ethylene content in said block segment B is 20 to 80% by weight.

### Claim 8 (depends on 1)

The polyolefin resin composition as claimed in claim 1 wherein component (c) is a diblock copolymer comprising a polyethylene block and an ethylene/butene copolymer block.

### Claim 9 (depends on 1)

The polyolefin resin composition as claimed in claim 1 wherein component (c) is a triblock copolymer comprising a polyethylene block, an ethylene/butene block and a polyethylene block.

### Claim 10 (depends on 1)

The polyolefin resin composition as claimed in claim 1 wherein component (c) is a diblock copolymer comprising a polyethylene block and an ethylene/propylene copolymer block.

### Claim 11 (depends on 1)

The polyolefin resin composition as claimed in claim 1, wherein said particulate ethylene/.alpha.-olefin rubber has an average dispersed particle size of no more than 1 .mu.m.