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US 12,157,691 B2Granted
Acid grafted EO-PO copolymers as silica scale inhibitors
AssigneesDow Global Technologies LLC, Rohm and Haas Company
InventorsPuspendu Deo, Graham P. Abramo, Kaylie L. Young, Somil Chandrakant Mehta
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Abstract
A method for inhibiting silica scale formation which treats aqueous systems with a polymerizable-acid graft copolymer that includes an unsaturated grafting acid and having a percent acid graft of between about 3 wt. % and about 35 wt. %, as well as an alkylene oxide polymer backbone.
Claims3
A method of inhibiting silica scale formation, said method comprising the steps of:
- treating an aqueous system comprising silica with an effective amount of a polymerizable-acid graft polymer consisting of an unsaturated grafting acid and an alkylene oxide polymer backbone, said alkylene oxide polymer backbone having the following formula:
- wherein each R′ is independently selected from the group consisting of a hydrogen radical, and acyl radicals;
- wherein R″ is independently selected from the group consisting of a hydrogen radical, amine-containing radicals, and acyl radicals;
- wherein each “n” has, independently, a value of from 2 to 4;
- wherein each “Z” has, independently, a value of from 4 to about 1800;
- and
- wherein “a” has a value of from 1 to 4;
- wherein said grafting acid is present in an amount of 10 wt.
5 more elements
Dependencies are inferred from the claim text.