Process for the polymerization of formaldehyde in the presence of anionically polymerized lactam
US4000217A · kind A · utility
4Cited by
4References
9Claims
0Family size
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Key dates
| Filing date | Dec 22, 1975 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Dec 22, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2/38
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyoxymethylene is prepared by feeding anhydrous formaldehyde into a reaction medium containing a liquid organic diluent non-solvent for the polyoxymethylene and non-reactive towards the other constituents of the reaction medium, and containing in a dispersed form a polymer A carrying a terminal ionic couple on its macromolecular chain, said polymer A being a polylactamic block of recurring units ##STR1## wherein PM is a linear polymethylene chain having from 3 to 13 carbon atoms, and being present in a proportion of from 0.001 to 0.1% by weight with respect to the polyoxymethylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.