Title:
METHOD FOR PRODUCING EMULSION COMPOSITION AND METHOD FOR PRODUCING HEAT-SEALING AGENT
Document Type and Number:
WIPO Patent Application WO/2023/085096
Kind Code:
A1
Abstract:
[Problem] The purpose of the present invention is to provide: a method for producing an emulsion composition that exhibits excellent heat-sealing ability; and a method for producing a heat-sealing agent that contains the emulsion composition. [Solution] This method for producing an emulsion composition is characterized by comprising adding, in separate portions, a mercaptan (A), when performing emulsion polymerization of a monomer mixture in the presence of the mercaptan (A) to obtain an emulsion composition containing a copolymer (B) that satisfies all conditions of (1)-(5). (1) Containing at least a (meth)acrylic acid ester (b1) in an amount of 90 mass% in a structural unit of the copolymer (B).
(2) Containing 35-55 mass% of a methyl methacrylate (b2) as a structural unit of the copolymer (B).
(3) Containing 15-55 mass% of a butyl acrylate (b3) as a structural unit of the copolymer (B).
(4) Having a glass transition temperature (Tg) of -20°C to 15℃ as calculated from the ratio of monomers forming the copolymer (B).
(5) The molecular weight distribution (weight average molecular weight Mw/number average molecular weight Mn) of the copolymer (B) being in a range of 9-15.
Inventors:
SATO KUMI (JP)
FUJIWARA YASUSHI (JP)
FUJIWARA YASUSHI (JP)
Application Number:
PCT/JP2022/039984
Publication Date:
May 19, 2023
Filing Date:
October 26, 2022
Export Citation:
Assignee:
SEIKO PMC CORP (JP)
International Classes:
C08F220/14; C09J133/12; D21H19/20
Foreign References:
| JP2016505698A | 2016-02-25 | |||
| JPH08325311A | 1996-12-10 | |||
| JP2015511976A | 2015-04-23 |
Attorney, Agent or Firm:
TSUTA Yasuhiro (JP)
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