Patent ID: 6613429
Filing Date: 2003-09-02
Classification: D06N,Y10T

Abstract:
A sheet or plate for use as a thermoadhesive reinforcing material, said sheet or plate being thermoformable from a temperature of 80Â° C.-90Â° C. and thermoadhesive from a temperature of 80Â° C.-90Â° C., and having been produced bymixing a) a first component comprising 30% to 70% by weight of granules of one of a first polymer or a first mixture of polymers having a low melting point ranging from 50Â° C. to 90Â° C., which are thermoformable from a temperature of 80Â° C.-90Â° C., with b) a second component comprising 70% to 30% by weight of one of a second polymer or a second mixture of polymers having a higher melting or softening point, in granules or powder having a grain size of more than about 500 &mgr;m, the two components being thermoplastic and completely or partially compatible, and optionally with c) additives selected from the group consisting of inorganic fillers, plasticizers and colorants to obtain a third mixture; extruding the third mixture under low shear conditions at a low temperature ranging from 100Â° C. to 140Â° C. to produce a product having a rough and loosely bonded surface, said product having a pasty consistency which is insufficient to form a homogeneous mixture of molten polymers, thereby preventing complete inter-penetration of polymer networks on melting; and following extrusion and optional addition of a textile backing to the extruded product, rolling or calendering the product at high pressure at a temperature of about 100Â° C. to reduce the thickness, with cooling to a temperature of less than 30Â° C. before rolling or calendering is completed.