METHOD FOR PRODUCING AQUEOUS EMULSION OF ETHYLENE-VINYL ACETATE-BASED COPOLYMER

• Main Authors: ISE KATSUTOSHI, SHIRAHASE TORU
• Format: Patent
• Language: English
• Published: 12.08.2004
• Edition: 7
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

PROBLEM TO BE SOLVED: To provide a method for producing an aqueous emulsion of ethylene-vinyl acetate-based copolymer, containing or producing no formalin which is a harmful substance, and controlled as having a small particle diameter. SOLUTION: This method for producing the aqueous emulsion of the ethylene-vinyl acetate-based copolymer is provided by using a transition metal salt, erythorbic acids and/or ascorbic acids as reducing agents in a redox system catalyst, initiating the polymerization at 15-35°C temperature, elevating temperature to a prescribed polymerization temperature of 50-80°C by 0-60 min after the starting of the polymerization by using only the heat of the polymerization as a heat source and continuing the polymerization at 50-80°C afterwards. COPYRIGHT: (C)2004,JPO&NCIPI