Patent ID: 6613853
Filing Date: 2003-09-02
Classification: C08F

Abstract:
A method of producing a vinyl resin, which comprises(i) preparey polyvinyl alcohol resin (A) by hydrolysis in the presence of a solvent with a dielectric constant of 6-29 c.g.s.e.s.u., wherein the polyvinyl alcohol resin (A) has a degree of hydrolysis of not less than 65 mol % and a polymerization degree of not less than 700 and satisfying the following formula (1) 0.0300&lE;(3âˆ’Y)/X&lE;0.0330â€ƒâ€ƒ(1) â€ƒwherein X is a degree of hydrolysis (mol %) and Y is a degree of iodine absorption; (ii) subjecting a vinyl compound to suspension polymerization in a polymerization tank equipped with a reflux condenser in the presence of a dispersion stabilizer; and (iii) adding the polyvinyl alcohol resin (A) to the polymerization tank at a point where polymerization conversion of the vinyl compound is not less than 30%.