Method of producing polymeric aquagels and films,...

Details Method of producing polymeric aquagels and films,... Method of producing polymeric aquagels and films,...

C - Chemistry, Metallurgy

08

J

18/1184

C08J 7/06 (2006.01) C08J 3/18 (2006.01)

Patent

CA 1193412

A METHOD OF PRODUCING POLYMERIC AQUAGELS AND FILMS, PARTICULARLY OF POLYACRYLONITRILE, AND FILMS PRODUCED BY SUCH METHODS Abstract: A polymer film consists essentially of a biaxially-oriented high nitrile addition polymer containing at least 80% acrylonitrile repeating units and an impregnant in the form of a low molecular weight non-volatile polyalkylene glycol, preferably triethylene glycol, dispersed in the polymer in a sufficient amount to plasticize the polymer and increase film toughness. In producing the film, a continuous strip of a polymeric aqualgel having a substantially constant water content is passed through an aqueous bath containing the impregnant so that the impregnant is absorbed into the aquagel. The impregnant is added to the bath at a rate to maintain a substantially constant concentration of impregnant in the bath and allow concentration of water components in the aquagel and bath to reach equilibrium.

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