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Title:
METHOD FOR PRODUCING AQUEOUS EMULSION
Document Type and Number:
Japanese Patent JP2004161951
Kind Code:
A
Abstract:

To provide a method for producing an aqueous ethylene-vinyl acetate copolymer emulsion whose non-volatile matter content is at least 70 wt% and the viscosity is not more than 5000 mPa×s and having excellent flowability even under a low temperature.

Method for producing an aqueous emulsion, which contains an ethylene-vinyl acetate copolymer having a glass transition temperature of +10 to -30°C and whose non-volatile matter content is at least 70 wt% and the viscosity is not more than 5,000 mPa×s, by controlling the rate of polymerization within a definite range in the initial stage of polymerization. Desirably, by using emulsifying dispersant of 2-6 pts.wt. against vinyl acetate of 100 pts.wt. The emulsifying dispersant contains polyvinyl alcohol, whose saponification degree is ≥80 mol% and average polymerization degree is 200-500, and a poly(oxyethylene) nonionic surfactant of 10-20HLB. The 10-50% of total amount of polyvinyl alcohol to be used is applied at the start of polymerization and the 50-90% is to be supplied during polymerization.


Inventors:
SHIRAHASE TORU
ISE KATSUTOSHI
Application Number:
JP2002331999A
Publication Date:
June 10, 2004
Filing Date:
November 15, 2002
Export Citation:
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Assignee:
SUMITOMO CHEMICAL CO
International Classes:
C08F2/22; C08F210/02; C08F218/08; (IPC1-7): C08F2/22; C08F210/02; C08F218/08
Attorney, Agent or Firm:
Takashi Kuboyama
Toru Nakayama
Masayuki Enomoto