Inhibtion of silica scale using hydrophobically-modified alkylene oxide urethane copolymer
US-10160682-B2 · Dec 25, 2018 · US
Acid grafted EO-PO copolymers as silica scale inhibitors
US12157691B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12157691-B2 |
| Application number | US-201915734075-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 17, 2019 |
| Priority date | Jun 1, 2018 |
| Publication date | Dec 3, 2024 |
| Grant date | Dec 3, 2024 |
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Abstract
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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.
First claim
Opening claim text (preview).
What is claimed is: 1. 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. 2. The method of claim 1 wherein the grafting acid is acrylic acid. 3. The method of claim 1 wherein said alkylene oxide polymer backbone is poly(oxyethylene-oxypropylene) having a weight ratio of oxyethylene (“EO”) to oxypropylene (“PO”) of about 50:50.
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Classifications
Treatment of water, waste water, or sewage (C02F3/00 - C02F9/00 take precedence) · CPC title
graft · CPC title
by addition of complex-forming compounds · CPC title
containing polyether sequences · CPC title
on to polyethers, polyoxymethylenes or polyacetals {(C08F283/004 takes precedence)} · CPC title
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- What does patent US12157691B2 cover?
- 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.
- Who is the assignee on this patent?
- Dow Global Technologies Llc, Rohm & Haas
- What technology area does this patent fall under?
- Primary CPC classification C02F5/12. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 03 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).