Propylene impact copolymers having good optical properties
US8871868B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 2013 |
| Grant date | Oct 28, 2014 |
| Priority date | — |
| Expiry date | Jan 9, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2308/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Propylene impact copolymers (ICPs) are provided which comprise: (a) a matrix phase which comprises from 60 to 95 weight % of a polypropylene polymer containing from 0 to 6 mole % of units derived from one or more alpha-olefins other than propylene, and (b) a dispersed phase which comprises from 5 to 40 weight % of a copolymer derived from a first comonomer which can be either propylene or ethylene together with a second alpha-olefin comonomer. The ICP is further characterized by having a beta/alpha ratio less than or equal to 1.1. The ICPs of the present invention are particularly well suited for applications requiring clear, tough polymers such as thin walled injection molded articles for frozen food packaging applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.