High melt flow, highly-grafted polypropylene
US6228948A · kind A · utility
20Cited by
8References
8Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 15, 1999 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Jan 15, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F255/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Modified polymers, particularly polyolefins with improved flow over that of polyolefin alone, are produced by reacting polypropylene, maleic anhydride monomer, and a peroxy initiator in a twin-screw extruder. The maleic anhydride monomer is injected as a fluid and is grafted onto the base polypropylene during the degradation/chain scissioning process. Novel, highly-grafted polymers with high melt flow and other useful properties are produced in pellet form.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.