Scale inhibition using star polymers

US11492538B2 · kind B2 · utility

Assignees

• DOW GLOBAL TECHNOLOGIES LLC · US
• Rohm and Haas Company · US
• The Regents of the University of California · US

Inventors

• Puspendu Deo · Pearland, US
• Antony K. Van Dyk · Blue Bell, US
• Paul Clark · Midland, US
• David Lunn · Abingdon, GB
• Craig J. Hawker · Los Gatos, US
• Maria Simon · Lake Jackson, US
• Sungbaek Seo · Songgye-ri, KR
• Alaina McGrath · Lompoc, US

Key dates

• Filing date: Jan 28, 2020
• Grant date: Nov 8, 2022
• Expiry date: Jan 28, 2040

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B37/06
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A method for inhibiting scale comprises adding to a fluid that causes scale formation a polycarboxylic acid or a salt thereof which has a star structure and at least 5 arms. A star polymer comprising a core based on 2,2′-[Oxybis(methylene)]bis[2-(hydroxymethyl)-1,3-propanediol] and 6 arms comprising linear polycarboxylic acids of degree of polymerization (DP) of the arm of at least 2 and in some embodiments up to 15 or more is useful in inhibiting scale formation.