Gradient copolymers for use in automatic dishwashing systems
US11292992B2 · kind B2 · utility
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Key dates
| Filing date | Oct 9, 2018 |
| Grant date | Apr 5, 2022 |
| Priority date | — |
| Expiry date | Dec 26, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D2111/14
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A polymer comprising a first fraction and a second fraction, wherein the first fraction comprises from 90 to 100 wt % polymerized C3-C6 carboxylic acid monomer units; and the second fraction comprises from 30 to 80 wt % polymerized C3-C6 carboxylic acid monomer units and from 20 to 70 wt % polymerized sulfonic acid monomer units; wherein the first fraction is from 10 to 40 wt % of the polymer and the second fraction is from 60 to 90 wt % of the polymer; the polymer has Mw from 3,000 to 30,000; and monomers are randomly distributed within each fraction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.