Method for producing saponified ethylene-vinyl acetate copolymer
US6903159B2 · kind B2 · utility
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6Claims
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Key dates
| Filing date | Aug 22, 2001 |
| Grant date | Jun 7, 2005 |
| Priority date | — |
| Expiry date | Sep 19, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2810/50
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for producing a saponified ethylene-vinyl acetate copolymer which comprises saponifying an ethylene-vinyl acetate copolymer in an alcohol-based solvent with an alkali catalyst, wherein an amount between 100 ppm and 15,000 ppm of water with respect to the ethylene-vinyl acetate copolymer is supplied into the alcohol-based solvent. According to this method, discoloration, etc. of a saponified ethylene-vinyl acetate copolymer is inhibited, and visual characteristics of the saponified copolymer are improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.