Process for recovering thermoplastic polymers from dispersion

Details Process for recovering thermoplastic polymers from dispersion Process for recovering thermoplastic polymers from dispersion

1989-05-30

1990-10-02

Schofer, Joseph L.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528487, 525242, 525243, C08F 616, C08F 624

Patent

active

049608649

ABSTRACT:
Recovery of thermoplastic polymer solids from dispersions thereof by coagulation and subsequent washing of the solids is improved by contacting the polymer in the coagulation stage or the washing stage or in both stages with at least one tricarboxylic acid of the formula ##STR1## wherein X is a single covalent bond, --CH.sub.2 -- or --C.sub.2 H.sub.4 -- and R is H, --OH or ##STR2##

REFERENCES:
patent: 2444801 (1948-07-01), Arundale
patent: 2953554 (1960-09-01), Miller et al.
patent: 2961290 (1960-11-01), Kolb
patent: 3780138 (1973-12-01), Hassell et al.
patent: 4267278 (1981-05-01), Lindner et al.

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