Method for the thermal adhesion of parts made of acrylic plastic and parts made of engineering plastics

A method for the production of a flat composite from at least two plastic parts, a first plastic part and a second plastic part, each having a first and a second surface, wherein said first surfaces are adhesion surfaces and wherein said first plastic part is formed of polymethylmethacrylate and said second plastic part is formed of a polymer selected from the group consisting of polycarbonate, polyester, polyether, polyamide and mixtures thereof, comprising the steps of:

• (a) preheating said adhesion surface of said polymethylmethacrylate and second plastic parts to a temperature of 10 to 100° K. above the Vicat softening point of said polymethylmethacrylate and said second plastic part, with the proviso that said plastic parts retain their original shape during said preheating step;
• (b) pressing said first and second plastic parts between a first and a second rolls without the positioning of an auxiliary adhesion or film material between the first and second plastic parts, said rolls having been provided with means for exerting a pressing force so that said preheating adhesion surface of said first plastic part contacts with said preheated adhesion surface of said second plastic part;
• and
• (c) advancing said first and second plastic parts between said rolls at an advance rate of 5 to 200 mm/sec while exerting a pressing force of 10 to 500 N.

A method for the production of a flat composite from at least two plastic parts, a first plastic part of polymer A and a second plastic part of polymer B, each having a first and a second surface, wherein said first surfaces are adhesion surfaces and wherein polymer A and polymer B are identical and are selected from the group consisting of polyalkylmethacrylate, polycarbonate, polyether, polyamide and mixtures thereof, comprising the steps of:

• (a) preheating said adhesion surfaces of said first and second plastic parts to a temperature of 10 to 100° K. above the Vicat softening point of said polymer A and polymer B, with the proviso that said plastic parts retain their original shape during said preheating step;
• (b) pressing said first and second plastic parts between first and second rolls without the positioning of an auxiliary material between the first and second plastic parts, said rolls having been provided with means for exerting a pressing force so that said preheated adhesion surface of said first plastic part contacts with said preheated surface of said second plastic part;
• and
• (c) advancing said first and second plastic parts between said rolls at an advance rate of 5 to 200 mm/sec while exerting a pressing force of 5 to 500 N.