Methods for manufacturing films with a layer containing...

Details Methods for manufacturing films with a layer containing... Methods for manufacturing films with a layer containing...

B - Operations, Transporting

29

C

B29C 47/88 (2006.01)

Patent

CA 2356338

The invention relates to methods for producing films which in at least one layer contain fluoropolymers and poly(meth)acrylates. According to said methods first a mixture containing poly(meth)acrylate and fluoropolymers is prepared and said mixture is then processed into a film by extrusion of the mixture on a roll having a temperature <= 100 °C, preferably <=70 °C. The temperature of the mixture is kept below its gel temperature, during extrusion a filter is positioned upstream of the die inlet and the die temperature is maintained higher than the temperature of the mass entering the die but lower than the gel temperature of the mixture. Using the method provided for in the invention especially PVDF/PMMA films presenting high surface gloss and low clouding can be produced without the need for solvents or supporting films.

L'invention concerne des procédés de production de films contenant dans au moins une couche des fluoro-polymères et des poly(méth)acrylates. Ce procédé consiste à produire un mélange contenant un poly(méth)acrylate et un fluoro-polymère puis une feuille par extrusion de ce mélange sur un rouleau dont la température est </=100 DEG C, de préférence </=70 DEG C, sachant que l'on maintient la température du mélange en-deçà de la température de formation de gel du mélange; que lors de l'extrusion, on place un filtre face à l'entrée de la buse et que l'on maintient la buse à une température plus élevée que celle de la matière à l'entrée de la buse mais inférieure à la température de formation de gel du mélange. Le procédé selon l'invention permet de produire notamment des films PVDF/PMMA à grande brillance superficielle et à faible trouble, l'utilisation de solvants et de plaques supports étant devenue superflue.

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