Propylene polymer blends, processes of producing the same and polypropylene resin compositions
US6319991A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 1998 |
| Grant date | Nov 20, 2001 |
| Priority date | — |
| Expiry date | May 20, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2308/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A propylene polymer blend is disclosed which comprises (A) a propylene-.alpha.-olefin random copolymer with a propylene content of 90 to 99% by weight and (B) a propylene-.alpha.-olefin random copolymer with a propylene content of 55 to 90% by weight, wherein the intrinsic viscosity ([.eta..sub.B ]) of the copolymer B ranges from 1.3 to 3.5 dl/g, the ratio ([.eta..sub.B ]/[.eta..sub.A ]) of the intrinsic viscosity ([.eta..sub.B ]) of the copolymer B to the intrinsic viscosity ([.eta..sub.A ]) of the copolymer A ranges from 0.5 to 1.3 and a product (([.eta..sub.B ]/[.eta..sub.A ]).times.(W.sub.A /W.sub.B)) of the intrinsic ratio ([.eta..sub.B ]/[.eta..sub.A ]) of both copolymers and the weight ratio (W.sub.A /W.sub.B) of both copolymers ranges from 1.0 to 4.5. A polypropylene resin composition comprises 99 to 99.9999% by weight of the propylene polymer blend and 1 to 0.0001% by weight of an .alpha.-crystal nucleating agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.