Process for producing rubber-based graft copolymers

Details Process for producing rubber-based graft copolymers Process for producing rubber-based graft copolymers

1989-06-09

1990-01-30

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, 528488, 528490, 528503, 523352, 525243, C08J 316

Patent

active

048974625

ABSTRACT:
In a process for producing a rubber-containing graft copolymer, which comprises bringing a latex of a graft copolymer comprising 60% to 90% by weight of a rubbery polymer and 40% to 10% by weight of a hard polymer, said graft copolymer latex being obtained by emulsion polymerizing a hard polymer-forming monomer in a latex of said rubbery polymer and having a minimum film-forming temperature of 75.degree. C. or less, into contact with an aqueous electrolyte solution under stirring, thereby to coagulate the latex, and recovering the precipitated graft copolymer, the improvement is disclosed such that the graft copolymer latex is subjected to slow coagulation so as to allow the graft copolymer to precipitate as substantially spherical particles, wherein the term "slow coagulation" refers to coagulation which proceeds at a milder rate than that of coagulation in which the aqueous electrolyte solution is hydrochloric acid and the pH of the latex during coagulation is 1.8 or less.

REFERENCES:
patent: 3160620 (1964-12-01), Petersen
patent: 3483174 (1969-12-01), Libergood et al.
patent: 3761455 (1973-09-01), Tanaka et al.
patent: 3896093 (1975-07-01), Valoti et al.
patent: 4401806 (1983-08-01), Hagiwara et al.
patent: 4491658 (1985-01-01), Sugimori et al.

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