Iodine transfer polymerization method and compositions therefrom

US11390703B2 · kind B2 · utility

Assignees

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

Inventors

• Jing Ren · Hockessin, US
• Craig J. Hawker · Los Gatos, US
• Johannes Hermann WILLENBACHER · Ludwigshafen am Rhein, DE
• Alaina McGrath · Lompoc, US
• Benjaporn Narupai · Goleta, US
• David S. Laitar · Midland, US
• Antony K. Van Dyk · Blue Bell, US

Key dates

• Filing date: Feb 7, 2020
• Grant date: Jul 19, 2022
• Expiry date: Feb 7, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2438/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Iodine transfer radical polymerization of an ethylenically unsaturated monomer comprising (meth)acrylic acid, salt thereof, or combination thereof, in the presence of a radical polymerization initiator, an organoiodide, and a solvent, is a useful method for making (meth)acrylic acid polymers. The amounts of components utilized can be 2 to 100 equivalents of acrylic acid and 2 to 100 equivalents of sodium acrylate, both dissolved in water to form a 15 to 50 weight percent solution, based on the total weight of the acrylic acid, sodium acrylate, and water; 0.05 to 1 equivalent of an azo polymerization initiator, 1 equivalent of an organoiodide; and 0 to 3 equivalents of an iodide salt. (Meth)acrylic acid polymer solutions are made by these methods. The (meth)acrylic polymers are useful as dispersants.