Method of producing olefin polymer graft copolymers
US5140074A · kind A · utility
42Cited by
7References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1990 |
| Grant date | Aug 18, 1992 |
| Priority date | — |
| Expiry date | Dec 10, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S525/904
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a method of making graft copolymers of olefin polymers by contacting a particulate olefin polymer with a free radical polymeriztion initiator, e.g., a peroxide, and a vinyl monomer at about from 60.degree. to 125.degree. C., while controlling the monomer addition rate so that it does not exceed about 4.5 pph/min, and most preferably does not exceed about 3.0 pph/min, at any monomer feed level. To prevent polymer degradation, a non-oxidizing environment is maintained throughout the process, and residual free radicals are deactivated, and unreacted initiator is decomposed, before the graft copolymer is exposed to air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.