Process for the preparation of an aqueous emulsifier-stabilized vinyl acetate-ethylene copolymer dispersion with fine particle size
US9156920B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 2012 |
| Grant date | Oct 13, 2015 |
| Priority date | — |
| Expiry date | Jul 29, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/585
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing an aqueous emulsifier-stabilized vinyl acetate-ethylene copolymer dispersion with weight average particle size in a range from 100 nm to 300 nm includes emulsion polymerization of a reaction mixture including:a) vinyl acetate and ethylene,b) 0.05 to 1% by weight, based on the total weight of monomers and comonomers, of at least one functional comonomer selected from the group consisting of ethylenically unsaturated monomers with at least one phosphate group or phosphonic acid group or their salts and ethylenically unsaturated sulphonic acids or their salts,c) 0.5 to 5% by weight, based on the total weight of monomers and comonomers, of at least one anionic emulsifier and optionally one or more nonionic emulsifiers, andd) optionally at most 0.5%, based on the total weight of monomers and comonomers, of a protective colloid.The process reactor uses an external heat exchange circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.