Title:
PRODUCTION OF VINYL POLYMER GRANULES AND EXPANDABLE VINYL POLYMER GRANULES
Document Type and Number:
Japanese Patent JPH04279602
Kind Code:
A
Abstract:
PURPOSE:To provide the title granules free from problems of effluent treatment and quality, narrow in size distribution with reduced fine particles. CONSTITUTION:In suspension polymerization of a vinyl monomer in an aqueous medium in the presence of a poorly soluble phosphate and anionic surfactant, an aliphatic diamide compound is added to said vinyl monomer, and also within the period when its polymer conversion rate falls between 0 and 30wt.%, the pH value of the aqueous medium is set at 10-13 using a basic metal hydroxide.
Inventors:
KOBAYASHI YUJI
OKAMOTO TADASHI
SAKATA TOICHI
YOSHIKAWA TORU
KUNITAKE KAZUHIKO
HIBINO SHINGO
OKAMOTO TADASHI
SAKATA TOICHI
YOSHIKAWA TORU
KUNITAKE KAZUHIKO
HIBINO SHINGO
Application Number:
JP10905491A
Publication Date:
October 05, 1992
Filing Date:
May 14, 1991
Export Citation:
Assignee:
HITACHI CHEMICAL CO LTD
International Classes:
C08F2/18; C08F2/44; C08F12/00; C08F12/08; C08J3/16; C08J9/16; C08J9/18; (IPC1-7): C08F2/18; C08F2/44; C08F12/08; C08J3/16; C08J9/18
Attorney, Agent or Firm:
Kunihiko Wakabayashi