US 7,488,780 B2
	Process for preparing vinyl chloride copolymer resin
Kisaburo Noguchi, Kobe (Japan); Toshihito Kawauchi, Kobe (Japan); Mitsuyoshi Kuwahata, Kobe (Japan); and Yukio Higashiyama, Otsu (Japan)
Assigned to Kaneka Corporation, Osaka (Japan)
Appl. No. 10/583,351 PCT Filed Dec. 14, 2004, PCT No. PCT/JP2004/018989 § 371(c)(1), (2), (4) Date Jun. 19, 2006, PCT Pub. No. WO2005/061569, PCT Pub. Date Jul. 07, 2005.
Claims priority of application No. 2003-425498 (JP), filed on Dec. 22, 2003; application No. 2003-432877 (JP), filed on Dec. 26, 2003; and application No. 2004-308548 (JP), filed on Oct. 22, 2004.
Prior Publication US 2007/0167595 A1, Jul. 19, 2007
Int. Cl. C08F 265/04 (2006.01)

U.S. Cl. 525—308  [525/309; 526/88; 526/329.4]

11 Claims

1. A process for preparing a vinyl chloride copolymer resin by copolymerizing a vinyl chloride type monomer and a macromonomer having a polymer comprising an ethylenically unsaturated monomer containing a double bond in a main chain, wherein the vinyl chloride type monomer and the macromonomer having a polymer comprising an ethylenically unsaturated monomer containing a double bond in a main chain are previously dispersed and mixed at a temperature from 20° C. to 60° C. for at least 1 minute so as to obtain a mixture solution, and copolymerization reaction of the mixture solution is carried out.