Title:
【発明の名称】改質されたポリビニルアルコール及びフリーラジカルグラフト化によるポリビニルアルコールの固相改質法
Document Type and Number:
Japanese Patent JP2720892
Kind Code:
B2
Abstract:
Modifying polyvinyl alcohol comprises (a) spraying a PVA powder with an amt. of solvent contg. a free radical polymerisable monomer such that the solvent swells the PVA powder but does not form a slurry with the PVA powder and does not dissolve the powder; (b) allowing the sprayed powder to swell; (c) spraying a free radical source onto the swollen powder; (d) raising the temp. of the swollen powder to initiate a reaction between the PVA and the polymerisable monomer. Pref., the PVA powder is maintained under constant agitation. The PVA has a particle size of less than about 5mm. The polymerisable monomer is selected from vinyl sulphonic acid, allyl sulphonic acid, methallyl sulphonic acid, salts of these acids, acrylamide, N-methylol acrylamide, 2-acrylamido methyl-propane sulphonic acid, acrylonitrile, acrylic acid, methacrylic acid and mixts. thereof; pref., allyl sulphonic acid or a salt thereof. The PVA is 87-89 mole.% hydrolysed. The solvent is water. Glycerol monooleate is added to facilitate mixing. The polymerisable monomer and the free radical source are added in stages.
Inventors:
AMIIA FUAMIRI
ROORI ANDAASON BURAATSUANOSU
FUIN RENNAATO MAATEN
ROORI ANDAASON BURAATSUANOSU
FUIN RENNAATO MAATEN
Application Number:
JP15405994A
Publication Date:
March 04, 1998
Filing Date:
July 06, 1994
Export Citation:
Assignee:
EA PURODAKUTSU ANDO CHEM INC
International Classes:
C08F16/06; C08F261/04; C08F8/00; (IPC1-7): C08F8/00; C08F16/06
Attorney, Agent or Firm:
Chika Takagi (2 outside)