High solids polycarboxylate synthesis for cement superplasticizers
US10899666B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 2016 |
| Grant date | Jan 26, 2021 |
| Priority date | — |
| Expiry date | Nov 20, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/32
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides efficient methods to form a high solids content polymeric polyacid or a comb polymer useful as a superplasticizer or dispersant which comprise heating to from 80 to 100 C. for a first time period, and then, sequentially, heating to a second temperature of from 150 to 250° C. for a second time period a wet reaction mixture having a solids content of from 80 to 99 wt. % and comprising from 15 to 60 wt. % of one or more ethylenically unsaturated acid or a salt thereof, from 37 to 76.99 wt. % of one or more polyether polyols, alkyl polyether polyols, polyether amines or alkyl polyether amines in the presence of (i) from 0.01 to 1 wt. %, of one or more water soluble radical initiators or redox pairs and (ii) from 2 to 22 wt. % of one or more phosphorus oxide containing compounds, all weights based on the total weight of the wet reaction mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.