Title:
MANUFACTURE OF INSOLUBLE AND LOW SWELLABILITY POWDERY POLYMER
Document Type and Number:
Japanese Patent JPS6178808
Kind Code:
A
Abstract:
Insoluble polymer powders which are only slightly swellable and are based on N-vinylpyrrolidone are prepared by polymerization of N-vinylpyrrolidone or a mixture of this with copolymerizable monomers and from 0.1 to 10% by weight, based on the total amount of monomers, of a crosslinking agent in a powder bed in the presence of a heat-transfer medium, which is inert to the reactants, and in the absence of oxygen and polymerization initiators, at from 90 DEG to 220 DEG C., while maintaining the powder state, circulating the reaction mass and evaporating the heat-transfer medium from the polymerization zone. The resulting insoluble polymers which are only slightly swellable are used as adsorbents or formulation assistants for fertilizers and crop protection agents.
Inventors:
CHIYUN JII CHIYAN
KAARUHAINTSU MESUMAA
WARUTAA DENRUTSUINGAA
KAARUHAINTSU MESUMAA
WARUTAA DENRUTSUINGAA
Application Number:
JP20359785A
Publication Date:
April 22, 1986
Filing Date:
September 17, 1985
Export Citation:
Assignee:
BASF AG
International Classes:
C08F218/00; C08F2/12; C08F2/36; C08F2/44; C08F20/00; C08F20/52; C08F26/00; C08F26/10; C08F218/02; C08F220/00; C08F220/10; C08F220/56; C08F226/06; C08F226/10; (IPC1-7): C08F220/10; C08F220/56; C08F226/06; C08F226/10
Attorney, Agent or Firm:
Toshio Yano (2 outside)