Core-shell composite polymers having high amounts of carboxylic

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

1980-07-25

1982-02-09

Hamrock, William F.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525902, C08F26506, C08F26304

Patent

active

043150853

ABSTRACT:
Aqueous dispersions of soft polymers, and particularly butadiene-styrene copolymers, containing high amounts of carboxylic acid units are prepared by a core-shell polymerization 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 methylmethacrylate 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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patent: 3644584 (1972-02-01), Fryd
patent: 3646164 (1972-02-01), Deichert et al.
patent: 3652721 (1972-03-01), Dalton et al.
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patent: 3700754 (1972-10-01), Schmitt et al.
patent: 4002801 (1977-01-01), Knechtges et al.
patent: 4264678 (1981-04-01), Nelsen et al.

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