Core-shell composite polymers having high amounts of...

Details Core-shell composite polymers having high amounts of... Core-shell composite polymers having high amounts of...

C - Chemistry, Metallurgy

08

F

117/47

C08F 291/00 (2006.01) C08F 285/00 (2006.01)

Patent

CA 1157992

DN-1164 CORE-SHELL COMPOSITE POLYMERS HAVING HIGH AMOUNTS OF CARBOXYLIC-ACID-UNITS-IN-THE-SHELL ABSTRACT OF THE DISCLOSURE Aqueous dispersions of soft polymers, and particularly butadiene-styrene copolymers, containing high amounts of carboxylic acid units are prepared by a core-shell polymeri- zation technique in which there is first polymerized around the soft polymer an inner shell layer of methylmethacrylate, thereby completely encasing the soft polymer particles. Then an outer layer of methlmethacrylate and methacrylic acid monomers is polymerized around the encased particles. The product contains up to about 40 mole percent of methacrylic acid units in the shell.

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