Block copolymers of lactone and lactam, compatibilizing agents, and compatiblized polymer blends
US6747096B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2002 |
| Grant date | Jun 8, 2004 |
| Priority date | — |
| Expiry date | Jul 5, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/44
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to high molecular weight block copolymers of one or more lactones and/or one or more lactams prepared by sequential bulk polymerization using a mixture of at least one anionic polymerization initiator and optionally at least one co-initiator. A preferred continuous sequential bulk reactive extrusion process comprises feeding a mixture of at least one lactam, at least one anionic polymerization initiator, and at least one co-initiator into the first (i.e., upstream) hopper of an extruder, and thereafter feeding at least one lactone into a second (i.e., downstream) hopper of the extruder. The preferred continuous sequential bulk reactive extrusion is solvent free, rapid (typical mean and maximum residence times in the extruder being no more than about 20 minutes and 30 minutes respectively), and produces a high conversion of monomers to block copolymer.The poly(lactone(s)/lactam(s)) block copolymer compatibilize the blending of otherwise immiscible or poorly miscible polymers to form polymer blends having improved mechanical and thermal properties. Accordingly, the block copolymers can be compounded with chlorine or fluorine containing polymers and other polyme…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.