Block copolymers of lactone and lactam, compatabilizing agents, and compatibilized polymer blends
US6835774B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2002 |
| Grant date | Dec 28, 2004 |
| Priority date | — |
| Expiry date | Sep 2, 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 &egr;-caprolactone and &ohgr;-lauryl lactam 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 &ohgr;-lauryl 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 &egr;-caprolactone 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(&egr;-caprolactone/&ohgr;-lauryl lactam) block copolymers 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 containing polymers and other pol…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.