Continuous esterification and/or amidification method, without organic solvent, of an acid homopolymer or copolymer
US10207446B2 · kind B2 · utility
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17Claims
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Key dates
| Filing date | Dec 7, 2015 |
| Grant date | Feb 19, 2019 |
| Priority date | — |
| Expiry date | Dec 23, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/05
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to a continuous process for preparing a comb polymer, without organic solvent, by esterification and/or amidification of an acidic homopolymer or copolymer, which consists in performing the esterification and/or amidification of said homopolymer/copolymer by reaction at elevated temperature in the mixing and transportation zone of a tubular reactor, optionally equipped with a water removal system, in the presence of at least one poly(alkylene glycol) in solid or molten form and of an antioxidant, said esterification and/or amidification taking place at a temperature greater than or equal to 170° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.