The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 30, 1990
Filed:
Jun. 09, 1989
Kureha Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
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.