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:
Sep. 01, 2020
Filed:
Jan. 26, 2017
Zeon Corporation, Tokyo, JP;
Hidetake Ishii, Tokyo, JP;
Junji Kodemura, Tokyo, JP;
ZEON CORPORATION, Tokyo, JP;
Abstract
A polymer latex, including a polymerization step of polymerizing a monomer in organic solvent to thereby obtain polymer solution of synthetic polyisoprene and/or styrene-isoprene-styrene block copolymer, antioxidant addition step of adding antioxidant to the polymer solution of synthetic polyisoprene and/or styrene-isoprene-styrene block copolymer at proportion of 0.01-1.00 parts by weight per 100 parts by weight of the synthetic polyisoprene and/or styrene-isoprene-styrene block copolymer, and emulsification step of emulsifying the polymer solution which the antioxidant is added, in water in the presence of a surfactant, to thereby obtain polymer latex, wherein the emulsification performs in the emulsification step so the ratio D75/D25 of the volume particle size D75 at a cumulative frequency of 75% to the volume particle size D25 at a cumulative frequency of 25% of a particle of the synthetic polyisoprene and/or styrene-isoprene-styrene block copolymer included in the polymer latex is 1.90 or more and 2.30 or less.