# US 5,703,172 A · Propylene block copolymer and process for producing the same

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- Number: US 5,703,172 A
- Document ID: US5703172A
- Status: Granted
- Kind: A
- Application number: 08/558,872
- Filed: 1995-11-16
- Granted: 1997-12-30
- Earliest claimed: 1994-11-21
- Assignees: Showa Denko K.K.
- Inventors: Kazuyuki Watanabe; Hisayoshi Yanagihara; Shimako Matsumoto
- Web page: https://patentgrep.com/patent/US5703172A

## CPC

- C08F 10/06: Propene
- C08F 297/08: polymerising mono-olefins
- C08F 297/083: {the monomers being ethylene or propylene}
- C08L 23/10: Homopolymers or copolymers of propene
- 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
- C08F 110/06: Propene
- C08F 210/06: Propene
- C08L 23/04: Homopolymers or copolymers of ethene
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08L 23/14: Copolymers of propene (C08L23/16 takes precedence)
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C08L 51/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- C08L 2205/18: Spheres
- C08L 2207/02: Heterophasic composition
- C08L 2308/00: Chemical blending or stepwise polymerisation process with the same catalyst
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A propylene block copolymer comprising a matrix phase and a dispersed phase dispersed in said matrix phase, said matrix phase comprising (a) polypropylene; said dispersed phase having an average particle diameter of from 0.1 to 5 .mu.m; and said dispersed phase comprising an outer layer comprising (b) propylene-.alpha.-olefin copolymer rubber and an inner layer comprising (c) crystalline polyethylene dispersed therein a plurality of particles comprising an outer layer comprising (b') propylene-.alpha.-olefin copolymer rubber and an inner layer comprising (a') polypropylene, a propylene block copolymer comprising a matrix phase and a dispersed phase dispersed in said matrix phase, said matrix phase comprising (a) polypropylene; said dispersed phase having an average particle diameter of from 0.1 to 5 .mu.m; and said dispersed phase comprising (b) propylene-.alpha.-olefin copolymer rubber having therein at least one particle comprising (a') polypropylene and at least one particle comprising (c) crystalline polyethylene. Propylene block copolymer resin compositions comprising the propylene block copolymers, and processes for producing a propylene block copolymers.

## Claims

### Claim 1

A propylene block copolymer comprising a matrix phase and a dispersed phase dispersed in said matrix phase,
said matrix phase comprising (a) polypropylene;
said dispersed phase having an average particle diameter of from 0.1 to 5 .mu.m; and
said dispersed phase comprising
an outer layer comprising (b) propylene-.alpha.-olefin copolymer rubber and
an inner layer comprising (c) crystalline polyethylene dispersed therein a plurality of particles comprising an outer layer comprising (b') propylene-.alpha.-olefin copolymer rubber and an inner layer comprising (a') polypropylene.

### Claim 2 (depends on 1)

A propylene block copolymer as claimed in claim 1, wherein said propylene block copolymer comprises (a) polypropylene, (b) propylene-.alpha.-olefin copolymer rubber having an .alpha.-olefin content of from 20 to 80% by weight, and (c) crystalline polyethylene having a density of 0.92 g/cm.sup.3 or more,
the amount of said polypropylene (a) being 30 to 94.9% by weight based on the total amount of components (a), (b), and (c),
the amount of said propylene-.alpha.-olefin copolymer rubber (b) being 5 to 50% by weight based on the total amount of components (a), (b), and (c),
the amount of said polyethylene (c) being 0.1 to 20% by weight based on the total amount of components (a), (b), and (c).

### Claim 3 (depends on 1)

A propylene block copolymer as claimed in claim 1, wherein said polypropylene (a) constituting said matrix phase has
(i) an insoluble amount on xylene extraction at 25.degree. C. of 99.0% by weight or more;
(ii) an isotactic pentad fraction of 98.0% or more;
(iii) an isotactic average chain length of 500 or more; and
(iv) a total amount of fractions having an isotactic average chain length of 800 or more obtained in a column chromatographic separation of 10% by weight or more.

### Claim 4 (depends on 1)

A propylene block copolymer as claimed in claim 1, wherein said .alpha.-olefin is ethylene or 1-butene.

### Claim 5

A propylene block copolymer resin composition comprising a propylene block copolymer and a nucleating agent in an amount of from 0.05 to 30% by weight based on the amount of said propylene block copolymer,
said propylene block copolymer comprising a matrix phase and a dispersed phase dispersed in said matrix phase,
said matrix phase comprising (a) polypropylene;
said dispersed phase having an average particle diameter of from 0.1 to 5 .mu.m; and
said dispersed phase comprising
an outer layer comprising (b) propylene-.alpha.-olefin copolymer rubber and
an inner layer comprising(c) crystalline polyethylene dispersed therein a plurality of particles comprising an outer layer comprising (b') propylene-.alpha.-olefin copolymer rubber and an inner layer comprising (a') polypropylene.