Method for producing powdery and granular polymers

Details Method for producing powdery and granular polymers Method for producing powdery and granular polymers

1994-02-16

1996-05-07

Michl, Paul R.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528486, 523352, 524156, 524161, C08L 3312, C08F 622

Patent

active

055147720

ABSTRACT:
A method for producing a powdery and granular polymer by two coagulation steps comprising coagulating a latex of the polymer, the latex containing a sulfuric acid ester series and/or sulfonic acid series anionic surface active agents, with an acid to an amount of the polymer of 40 to 80 wt. % at a first coagulation step, and then bringing coagulation to completion with an acid or salt at a second coagulation step. According to the present invention, a powdery and granular polymer having a sharp particle size distribution and a high bulk specific gravity can be obtained.

REFERENCES:
patent: 2467054 (1949-04-01), Rumbold
patent: 2482048 (1949-09-01), Williams
patent: 3079360 (1963-02-01), Sutherland, Jr. et al.
patent: 3607983 (1971-09-01), Rushton et al.
patent: 4374941 (1983-02-01), Sandstrom
patent: 4897462 (1990-01-01), Yusa et al.
Database WPI, Derwent Publications Ltd., vol. 8, No. 199 (C-242), AN-82-200 359, JP-A-59 091 103, May 25, 1984.
Database WPI, Derwent Publications Ltd., AN 94-012303 02!, JP-A-5 320 221, Dec. 3, 1993.

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