| 摘要 |
PCT No. PCT/FR97/00305 Sec. 371 Date Sep. 15, 1998 Sec. 102(e) Date Sep. 15, 1998 PCT Filed Feb. 19, 1997 PCT Pub. No. WO97/30837 PCT Pub. Date Aug. 28, 1997A method for making sheets and/or plates that are thermoformable as of a temperature of 80-90 DEG C. and heat-tackifiable as of 80-90 DEG 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 DEG C.) and are thermoformable as of 80-90 DEG 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 mu m, and preferably of 500-1000 mu m, 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 DEG 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 DEG C. to reduce the thickness thereof, then cooled to less than 30 DEG C. before the end of the lamination or calendering process. |
