Title:
ポリピバル酸ビニルの調製方法
Document Type and Number:
Japanese Patent JP2004522835
Kind Code:
A
Abstract:
Poly(vinyl pivalate) exhibiting a high syndiotacticity and a high molecular weight is prepared through suspension polymerization of vinyl pivalate at low temperatures. Furthermore, poly(vinyl pivalate) microspheres with a high syndiotacticity is prepared for use as a precursor for PVA with a high molecular weight and a high syndiotacticity through suspension polymerization of vinyl pivalate at 20 to 70° C. with the use of azobisdimethylvaleronitrile as an initiator. In addition, poly(vinyl pivalate) is separated using a dispersing agent and a precipitating agent to thereby prepare poly(vinyl pivalate) microspheres with various sizes and a uniform size distribution. The poly(vinyl pivalate) microspheres are suspended in an aqueous alkali soloution such that only the surface thereof is saponified to PVA. In this way, embolic particles with a spherical shape are obtained to be useable as an embolic material for embolotherapy.
Inventors:
Gim, Han-Do
Yeum, Jeon-Hyun
Park, Chang-Sik
Yun, Won-Jae
No, Tae-One
Shin, Don-Yoon
Ryu, Won-Theoc
Yeum, Jeon-Hyun
Park, Chang-Sik
Yun, Won-Jae
No, Tae-One
Shin, Don-Yoon
Ryu, Won-Theoc
Application Number:
JP2002558397A
Publication Date:
July 29, 2004
Filing Date:
January 17, 2002
Export Citation:
Assignee:
Ace Digitech, Limited
Ryu, Won-Theoc
Ryu, Won-Theoc
International Classes:
A61L31/00; A61K31/765; A61P9/00; A61P31/06; A61P35/00; C08F2/20; C08F8/12; C08F18/08; C08F18/10; C08F118/10; D01F6/16; (IPC1-7): C08F2/20; A61K31/765; A61L31/00; A61P9/00; A61P31/06; A61P35/00; C08F8/12; C08F118/10
Attorney, Agent or Firm:
Hidekazu Miyoshi
Yasuo Miyoshi
Yasuo Miyoshi