Title:
ADDITIVE FOR IMPROVING POLYVINYL CHLORIDE CRACK RESISTANCE
Document Type and Number:
Japanese Patent JPS57123240
Kind Code:
A
Abstract:
1. Additive to improve the fracture resistance of PVC, in the form of particles in which there is a gradient of molecular weight increasing from 40 000 to 80 000 at the surface, to values of 60 000 to 300 000 inside of the particle and a degree of cristallinity increasing from 5 to 10% at the surface to values of 10 to 35% inside of the particle, said particles being obtained by the polymerization of vinyl chloride in aqueous emulsion, in two or more steps, at least one of these steps being carried out between 0 and 42 degrees C, while the last process step is carried out between 46 degrees and 60 degrees C.
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| JPS5314788 | PREPARATION OF POLYVINYL CHLORIDE |
Inventors:
JIYANNMARI RIEJIYUWA
Application Number:
JP19944381A
Publication Date:
July 31, 1982
Filing Date:
December 09, 1981
Export Citation:
Assignee:
JIYANNMARI RIEJIYUWA
International Classes:
C08F2/00; C08F2/22; C08F14/06; C08F259/04; C08F14/00; C08L1/00; C08L27/00; C08L27/06; C08L29/00; (IPC1-7): C08F2/22; C08F14/06; C08L27/06