Process to produce polyvinyl-ester compositions with low residual monomer and the use thereof
US10800867B2 · kind B2 · utility
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Key dates
| Filing date | Dec 3, 2013 |
| Grant date | Oct 13, 2020 |
| Priority date | — |
| Expiry date | Dec 3, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/68
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for reducing the amount of residual monomer in aqueous polymerization emulsion by using a sequential polymerization steps, The first step consists in adding an emulsion, of vinyl ester of alkyl of C1 to C18 carboxylic acids, to water containing a radical initiator, the second step consists in adding further an emulsion of alkyl acrylate and/or methacrylate, and the third step consists in c) adding to polymeric emulsion, resulting of the steps a) and b), pure liquid acrylate or methacrylate with alkyl chain of C1 to C12.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.