Copolymers of pivalolactone and isoprene or butadiene
US4034021A · kind A · utility
2Cited by
4References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 25, 1975 |
| Grant date | Jul 5, 1977 |
| Priority date | — |
| Expiry date | Jun 25, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31942
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed herein are new, specifically modified, copolymers of pivalolactone with isoprene and/or butadiene. Also disclosed is a process for making copolymers comprising (1) polymerizing the diene with a lithium initiator and, optionally, metallating the resulting lithiopolydiene with an alkyllithium, (2) carboxylating the resulting polylithiopolydiene by reaction with carbon dioxide, (3) reacting the polymeric lithium carboxylate with tetraalkylammonium hydroxide or halide and (4) reacting the tetraalkylammonium salt with pivalolactone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.