Azetidinedione-monocarbonamide capped prepolymer
US4668756A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1985 |
| Grant date | May 26, 1987 |
| Priority date | — |
| Expiry date | Nov 21, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/14
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Novel polyamide block copolymers are provided which comprise a central block of a soft segment derived from the residue of a polymeric polyol or polycarboxylic acid joined to terminal hard segment polyamide blocks. The linkages which join the blocks are of a novel type and are the opened form of certain monoazetidine-2,4-dione rings. The block copolymers can be prepared very rapidly via anionically polymerizing lactams on to prepolymer soft segments containing terminal azetidine-2,4-dione rings. The speed with which the polymerizations can be carried out make the block copolymers particularly useful for the RIM preparation of molded parts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.