Melt-processed blends containing poly(vinyl alcohol)

Details Melt-processed blends containing poly(vinyl alcohol) Melt-processed blends containing poly(vinyl alcohol)

C - Chemistry, Metallurgy

08

L

C08L 29/04 (2006.01) C08L 25/12 (2006.01) C08L 55/02 (2006.01)

Patent

CA 2198840

Polymers containing a high percentage of vinyl alcohol units are difficult to process into sheet, film, injection-molded objects, or fibers. Such melt-processing is greatly enhanced by admixing certain core/shell copolymers having a rubbery, preferably crosslinked core mainly of units derived from butadiene, and an outershell mainly of a copolymer of styrene and acrylonitrile. Such copolymers do notrequire the presence of functional groups capable of reaction with the hydroxyl groups of the poly(vinyl alcohol).

Il est difficile de transformer certains polymères renfermant un pourcentage élevé d'unités d'alcool vinylique en feuilles, pellicules, articles moulés par injection ou en fibres. Cette transformation à chaud est grandement améliorée par addition de certains copolymères à noyau caoutchouteux, constitué de préférence d'unités réticulées de dérivé du butadiène, et d'une enveloppe renfermant principalement un copolymère de styrène et d'acrylonitrile. Ces copolymères ne nécessitent pas la présence de groupes fonctionnels pouvant réagir avec les groupes hydroxyles du poly(alcool vinylique).

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