Process for polymerizing formaldehyde
US4332930A · kind A · utility
1Cited by
3References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1980 |
| Grant date | Jun 1, 1982 |
| Priority date | — |
| Expiry date | Aug 22, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Undesirable deposition of polyoxymethylene onto the inner wall of a polymerization vessel and onto a stirrer, which deposition is observed in the slurry polymerization of formaldehyde carried out in an inert organic liquid medium in the presence of a polymerization catalyst, can be minimized by carrying out the slurry polymerization in the presence of at least one polyvalent metal salt selected from polyvalent metal salts of alkylsalicylic acids and polyvalent metal salts of dialkyl esters of sulfosuccinic acid. Optionally, a polyethylene glycol monoether may be used in addition to the polyvalent metal salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.