# US 4,395,519 A · Physically blended propylene polymer composition

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- Number: US 4,395,519 A
- Document ID: US4395519A
- Status: Granted
- Kind: A
- Application number: 06/196,550
- Filed: 1980-10-14
- Granted: 1983-07-26
- Earliest claimed: 1979-04-18
- Assignees: Mitsui Petrochemical Industries, Ltd.
- Inventors: Syuji Minami; Norio Kashiwa; Akifumi Kato; Junichi Watanabe
- Web page: https://patentgrep.com/patent/US4395519A

## CPC

- C08L 23/10: Homopolymers or copolymers of propene
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- Y10S 2/918: Head covering
- 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

A physically blended propylene polymer composition composed of (A) 100 parts by weight of crystalline polypropylene containing 0 to 10 mole % of ethylene and/or another .alpha.-olefin, (B) 1 to 30 parts by weight of a propylene/ethylene random copolymer composed of 30 to 85 mole % of propylene, said copolymer containing 0 to 10 mole % of a diene component and having (i) a micro-isotacticity of at least 0.8 and (ii) a boiling n-cyclohexane insolubles content of 0 to 10% by weight, and (C) 0 to 30 parts by weight of polyethylene containing 0 to 15 mole % of an .alpha.-olefin, said components (A) and (B) having been physically mixed with each other.

## Claims

### Claim 1

A physically blended propylene polymer composition comprising
(A) 100 parts by weight of crystalline polypropylene containing 0 to 10 mole% of a member selected from the group consisting of ethylene, another .alpha.-olefin, and a mixture thereof,
(B) 1 to 30 parts by weight of a propylene/ethylene random copolymer composed of 30 to 85 mole% of propylene, said copolymer containing 0 to 10 mole% of a diene component and having (i) a micro-isotacticity of at least 0.8 and (ii) a boiling n-cyclohexane insolubles content of 0 to 10% by weight, said random copolymer being prepared by using a catalyst comprising a carrier-supported solid titanium catalyst component containing magnesium, halogen, titanium and an electron donor, and an organoaluminum compound catalyst component, and
(C) 0 to 30 parts by weight of polyethylene containing 0 to 15 mole% of an .alpha.-olefin, said components (A) and (B) having been physically mixed with each other.

### Claim 2 (depends on 1)

The composition of claim 1 wherein said propylene/ethylene random copolymer (B) has an intrinsic viscosity, measured in decalin at 135.degree. C. of 1 to 15.

### Claim 3 (depends on 1)

The composition of claim 1 wherein said propylene/ethylene random copolymer (B) has (i) a micro-isotacticity of at least 0.9 and (ii) a boiling n-cyclohexane insolubles content of 0 to 5% by weight.

### Claim 4 (depends on 1)

The composition of claim 1 wherein the amount of said propylene/ethylene random copolymer (B) and the amount of said polyethylene (C) are 3 to 20 parts by weight and 0 to 15 parts by weight, respectively, per 100 parts by weight of said crystalline polypropylene (A).

### Claim 5 (depends on 1)

The composition of claim 1 wherein said polyethylene (C) has been chemically mixed with said crystalline polypropylene (A).