Method for producing oxymethylene copolymer
US10954332B2 · kind B2 · utility
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Key dates
| Filing date | Jul 16, 2019 |
| Grant date | Mar 23, 2021 |
| Priority date | — |
| Expiry date | Jul 16, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L59/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for producing an oxymethylene copolymer which gives molded articles that are inhibited from emitting formaldehyde and can be reduced in yellowness is provided. In producing an oxymethylene copolymer, an effective polymerization initiator amount is regulated to a value within a given range, the amount being calculated from the amount of perchloric acid or a derivative thereof contained in the polymerization initiator and the amount of triethanolamine contained in all the monomers comprising trioxane and comonomers, which are starting materials for the copolymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.