C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 18/20 (2006.01) C08F 2/04 (2006.01) C08F 8/12 (2006.01) C08F 18/04 (2006.01)
Patent
CA 2174859
A method for the production of poly(vinyl trifluoroacetate) and copolymers thereof with vinyl esters is described. Poly(vinyl trifluoroacetate) (PVTFA) is obtained in essentially quantitative yield under mild conditions by using non-chlorofluorocarbon solvents comprising siloxanes or perfluorinated fluids. Hexamethyl disiloxane is a particularly useful example of such solvents. Synthesis of syndiotactic PVTFA on a commercial scale without the use of environmentally-harmful solvents is made possible by the invention, which provides a convenient commercial route to syndiotactic polyvinyl alcohol.
Procédé de production de poly(trifluoroacétate vinylique) et de copolymères de ce dernier avec des esters vinyliques. On obtient du poly(trifluoroacétate vinylique) (PVTFA) avec des rendements essentiellement quantitatifs dans des conditions modérées en utilisant des solvants sans chlorofluorocarbone à base de siloxanes ou de fluides perfluorés. L'hexaméthyle disiloxane représente un exemple particulièrement utile de ces solvants. Cette invention permet d'effectuer la synthèse de PVTFA syndiotactique à l'échelle commerciale sans utiliser de solvants dangereux pour l'environnement, ceci constituant une voie commerciale pratique pour l'alcool polyvinylique syndiotactique.
Eian Gilbert L.
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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