Process for producing powdery rubber

Details Process for producing powdery rubber Process for producing powdery rubber

1977-11-07

1980-03-25

Woodberry, Edwad M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 4R, 260 174BB, 260 174ST, 260 297WA, 260815, 260816G, 260821, 525194, 525197, 525199, 525203, 525212, 525215, 525217, 525221, 525222, 525227, 525230, 525232, 525233, 525235, C08L 128

Patent

active

041949994

ABSTRACT:
A powdery rubber is produced by mixing an anionic or nonionic rubber latex with an aqueous solution of an anionic water soluble macro-molecular compound which is dissociated in water to give negative charge; adjusting the pH to an acidic condition; adding to the aqueous solution either a cationic polymer which is water soluble in an acidic condition or a cationic surfactant which causes a coacervation with the anionic water soluble macromolecular compound in an acidic condition to separate the rubber particles from the rubber latex under coacervation and adding an emulsion of a synthetic resin having a glass transition temperature higher than 30.degree. C. to the rubber particles at a ratio of 1 to 50 wt.% (as a solid content) to the solid content of the rubber latex and dehydrating and drying the resulting powdery rubber.

REFERENCES:
patent: 3632507 (1972-01-01), Witt
patent: 3875104 (1975-04-01), Siegele
patent: 3915909 (1975-10-01), Schnoring
patent: 4031302 (1977-06-01), Shimizu et al.
patent: 4076661 (1978-02-01), Kassner
Chem. Absts., vol. 85: 109805x-"Chlorinated Rubber Particles," Nakazora et al.

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