Method for making thermoformable plastic sheets or plates...

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 5/18 (2006.01) D06N 3/00 (2006.01) D06N 3/12 (2006.01) D06N 3/14 (2006.01)

Patent

CA 2247069

A method for making sheets and/or plates that are thermoformable as of a temperature of 80-90 ~C and heat-tackifiable as of 80-90 ~C, and suitable for use as a heat-tackifiable reinforcing material. According to the method, 30-70 wt % of granules of one or more polymers that have a low melting point (50-90 ~C) and are thermoformable as of 80-90 ~C are mixed with 70-30 wt % of one or more polymers with a higher melting or softening point, in the form of granules or a powder having a particle size greater than around 500 µm, and preferably of 500-1000 µm, both kinds of polymers being thermoplastic and at least partially compatible, and optionally with the usual additives; the mixture is extruded under low-shear conditions at low temperatures of 100-140 ~C to give a mixture having a pasty consistency that is insufficient to form a uniform mixture of molten polymers; and, after extrusion, and optionally once a fabric base (9, 12) has been added to the extruded product, said product is laminated or calendered at a high pressure and at a temperature of around 100 ~C to reduce the thickness thereof, then cooled to less than 30 ~C before the end of the lamination or calendering process.

Procédé de fabrication de feuilles et/ou de plaques thermoformables dès la température de 80 ·C - 90 ·C et thermocollantes dès la température de 80 ·C - 90 ·C, utilisables comme matériau de renfort thermocollant, caractérisé en ce que: on mélange de 30 à 70 % en poids de granulés de polymère(s) de bas de point de fusion (50· à 90 ·C) thermoformables(s) dès la température de 80· - 90 ·C avec 70 à 30 % en poids de polymère(s) de plus haut point de fusion ou ramollissement en granulés ou en poudre de granulométrie supérieure à environ 500 µm, de préférence de 500 à 1000 µm, les deux types de polymères étant thermoplastiques et totalement ou partiellement compatibles, avec éventuellement des additifs usuels, on extrude le mélange dans de faibles conditions de cisaillement à des basses températures de 100· à 140 ·C donnant au mélange une consistance pâteuse insuffisante pour former un mélange homogène de polymères fondus, après cette extrusion et adjonction éventuelle d'un support textile (9, 12) au produit extrudé, on lamine ou on calandre le produit sous forte pression à une température de l'ordre de 100 ·C pour réduire l'épaisseur et on refroidit à température inférieure à 30 ·C avant la fin du laminage ou du calandrage.

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