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Machine translation
1. (WO1981001005) SUSPENSION POLYMERIZATION PROCESS FOR MAKING VINYL RESINS FOR USE IN PLASTISOLS
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/001005    International Application No.:    PCT/US1980/001266
Publication Date: 16.04.1981 International Filing Date: 22.09.1980
IPC:
C08F 14/06 (2006.01), C08F 2/20 (2006.01)
Applicants:
Inventors:
Priority Data:
84479 15.10.1979 US
Title (EN) SUSPENSION POLYMERIZATION PROCESS FOR MAKING VINYL RESINS FOR USE IN PLASTISOLS
(FR) PROCEDE DE POLYMERISATION EN SUSPENSION POUR LA PRODUCTION DE RESINES VINYLIQUES A UTILISER DANS DES PLASTISOLS
Abstract: front page image
(EN)This invention relates to the suspension polymerization of vinyl monomer (s) in an aqueous medium to form vinyl resins which are designed for use in making plastisols. The process is conducted in an aqueous medium using a free-radical yielding catalyst, and in the presence of a hydrolyzed polyvinyl acetate (polyvinyl alcohol) having a degree of hydrolysis in the range of about 65% to about 85% and a compound having a hydrophile-lipophile balance (HLB) less than about 3.5. The important aspect of the present new process is the use of agitation ramping, that is, changing the degree of agitation during the course of the reaction, and adding the catalyst to the reaction medium after the same has reached the reaction temperature whereby these are produced polymer particles which are dense spherical glassy beads having an average diameter in the range of about 10 to about 100 microns. The suspension resins so produced are easily and uniformly mixed with a plasticizer to form low viscosity plastisols which are stable, containing particules of uniform and proper size, and capable of producing films, and like products, of good clarity.
(FR)Polymerisation en suspension de monomeres vinyliques dans un milieu aqueux pour former des resines vinyliques destinees a etre utilisees dans la production de plastisols. Le procede est effectue dans un milieu aqueux utilisant un catalyseur a radicaux libres, en presence d'un acetate de polyvinyle hydrolyse (alcool polyvinylique) possedant un degre d'hydrolyse compris dans la plage entre environ 65% en environ 85% et un compose possedant un equilibre hydrophile-lipophile (HLB) inferieur a environ 3,5. L'aspect important du nouveau procede consiste en l'utilisation d'une rampe d'agitation, c'est-a-dire dans le changement du degre d'agitation en cours de reaction, et l'adjonction du catalyseur au milieu de reaction apres que celui-ci ait atteint la temperature de reaction a laquelle sont produites des particules de polymeres correspondant a des billes vitreuses denses et spheriques presentant un diametre moyen compris dans la plage comprise entre 10 et 100 microns environ. Les resines en suspension ainsi produites se melangent facilement et uniformement avec un plastifiant pour former des plastisols de faible viscosite qui sont stables, contiennent des particules de taille uniforme et convenable, et peuvent produire des films, ou des produits similaires, possedant une bonne clarte.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)