Block copolymers
US3979479A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1974 |
| Grant date | Sep 7, 1976 |
| Priority date | — |
| Expiry date | Dec 16, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/44
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A novel block copolymer HO--D--A--B--D--H, wherein PA1 A is a polylactonic block of recurring units ##EQU1## B is a polylactamic block of recurring units ##EQU2## C is a polyoxymethylene block of recurring units EQU --CH.sub.2 O-- is prepared by catalytic polymerization of at least one lactone ##EQU3## with at least one lactam ##EQU4## wherein: PM.sub.1 and PM.sub.2 are polymethylene linear chains having from 2 to 13 and 3 to 13 carbon atoms, respectively, and being either non-substituted or having at least one hydrogen atom replaced by an alkyl, aryl, alkylaryl or cycloalkyl radical, and reaction of the resulting A-B copolymer with monomeric formaldehyde. The block copolymer HO--D--A--B--D--H having a preponderant percentage in blocks A, B or D, respectively, behaves as a polylactone, polylactam or polyformaldehyde, respectively, having improved properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.