KR900000395A - Process for preparing interpolymers of ethylene, vinyl acetate, and reactive halogen-containing monomers - Google Patents

Abstract

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Description

Process for preparing interpolymers of ethylene, vinyl acetate and reactive halogen-containing monomers

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Claims (11)

A process for interpolymerizing ethylene, vinyl acetate and halogen-containing cured site monomers in an aqueous emulsion containing a nonionic surfactant, an anionic surfactant and a free radical polymerization catalyst, wherein the polymerization is carried out at a temperature of 5 to 80 ° C. and a temperature of 400 to 80 ° C. Characterized in that it is carried out at ethylene pressure of 4000 psig and the halogen-containing monomer is added continuously or intermittently for at least 1/20 of the total polymerization time after initiation of the polymerization. The method of claim 1. Wherein the curing site monomer is a halogen-containing vinyl monomer selected from vinyl chloroacetate, vinyl bromoacetate, vinyl 2-chloropropionate, vinyl 2-chlorobutyrate, vinyl 2-chloroisobutyrate or 2-chloroethyl vinyl ether. The process according to claim 1 or 2, wherein all vinyl acetate monomers are present at the start of the polymerization. The process according to claim 1 or 2, wherein most of the vinyl acetate monomer is present at the start of the polymerization and the remaining minor monomers are subsequently introduced. The process of claim 4 wherein a small amount of vinyl acetate monomer is mixed with a halogen-containing vinyl monomer to introduce continuously or intermittently during the polymerization. The process according to claim 1, wherein the polymerization is carried out at a temperature of 20 to 50 ° C. and the halogen-containing vinyl monomer is vinyl chloroacetate. 7. The process of claim 6 wherein the elastomer contains 55 to 65 weight percent vinyl acetate and 0.5 to 1 weight percent chlorine. 8. The process of claim 7, wherein the free radical catalyst is hydrogen peroxide, sodium perchlorate, sodium perborate, sodium persulfate, potassium persulfate or ammonium persulfate and is present in an amount of 0.5 to 3 percent by weight based on vinyl acetate monomer. The method according to claim 8, which is used as a reducing agent cocatalyst selected from sodium hydrogen sulfite, sodium bisulfite, sodium sulfite or sodium formaldehyde sulfoxylate. The method of claim 1, wherein the ethylene pressure is increased from 400 to 900 psig at the start of the polymerization during the polymerization and from 2000 to 4000 psig at the end of the polymerization. The method of claim 10 wherein the ethylene pressure is increased to about 1200 psig within the polymerization time of the first hour to two hours. ※ Note: The disclosure is based on the initial application.