Maleated high acid number high molecular weight polypropylene of low color
US7408007B2 · kind B2 · utility
7Cited by
39References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2005 |
| Grant date | Aug 5, 2008 |
| Priority date | — |
| Expiry date | Jun 2, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L77/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the manufacture of maleated polypropylenes having an acid number greater than 4.5, a yellowness index color of no greater than 76, and a number average molecular weight of at least 20,000. The process for making the maleated polypropylenes includes forming a mixture of molten polypropylene and molten maleic anhydride in a reactor, introducing a free radical initiator into the molten mixture to produce a product having maleic anhydride grafted onto the polypropylene, and recovering a high acid number, high molecular weight maleated polypropylene of low color from the reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.