Articles Comprising Rubber, Thermoplastic Polyurethane and Engineering Polymer

Abstract

Item comprising thermoplastic polyurethane, which has, respectively, direct-contact adhesive bonding not only to rubber but also to engineering plastic.

1 . An item comprising thermoplastic polyurethane, which has, respectively, direct-contact adhesive bonding not only to rubber but also to engineering plastic. 
     
     
         2 . The item according to  claim 1 , wherein the rubber and the engineering plastic have, respectively, separate direct-contact bonding to the thermoplastic polyurethane. 
     
     
         3 . The item according to  claim 1 , wherein the thermoplastic polyurethane is present between the rubber and the engineering plastic. 
     
     
         4 . The item according to  claim 3 , wherein the thickness of the layer of the thermoplastic polyurethane is from 0.2 to 6 mm. 
     
     
         5 . The item according to  claim 1 , which is a two-component injection-molded item with rubber insert part. 
     
     
         6 . The item according to  claim 1 , wherein the Shore A hardness of the thermoplastic polyurethane is smaller than 95 and the thermoplastic polyurethane comprises no plasticizers. 
     
     
         7 . The item according to  claim 1 , wherein the Shore hardness of the thermoplastic polyurethane is from 45 A to 80 A, its tensile strength to DIN 53504 is greater than 15 MPa, its tear propagation resistance to DIN 53515 is greater than 30 N/mm, and its abrasion value to DIN 53516 is smaller than 250 mm 3 . 
     
     
         8 . The item according to  claim 1 , wherein, for the bond between rubber and thermoplastic polyurethane, and for the bond between engineering plastic and thermoplastic polyurethane, the peel resistance to DIN EN 1464 is in each case at least 1 N/mm. 
     
     
         9 . The item according to  claim 1 , wherein the item is a rubber bearing for the mounting of machinery or motors, or in motor vehicle chassis. 
     
     
         10 . A process for production of an item comprising thermoplastic polyurethane, which has, respectively, direct-contact adhesive bonding not only to rubber but also to engineering plastic, which comprises plasma-treating the surface of a rubber item, then bringing the thermoplastic polyurethane into contact with the plasma-treated surface, and then applying the engineering plastic to the thermoplastic polyurethane. 
     
     
         11 . The process according to  claim 10 , wherein the thermoplastic polyurethane is applied by means of injection molding to the plasma-treated surface of the rubber. 
     
     
         12 . The process according to  claim 10 , wherein the thermoplastic polyurethane is present between the rubber and the engineering plastic. 
     
     
         13 . The process according to  claim 12 , wherein the thermoplastic polyurethane forms a layer whose thickness is from 0.2 mm to 6 mm. 
     
     
         14 . The process according to  claim 10 , wherein the engineering plastic is applied by means of injection molding to the surface of the thermoplastic polyurethane. 
     
     
         15 . The process according to  claim 10 , wherein the surface of the rubber insert part is plasma-treated, the plasma-treated rubber insert part is inserted into a mold, thermoplastic polyurethane is then applied by means of injection molding to the plasma-treated surface, and then engineering plastic is molded by means of injection molding onto the thermoplastic polyurethane in the same mold. 
     
     
         16 . The process according to  claim 10 , wherein the method of plasma-treatment of the rubber is such that a plasma is generated by means of high-voltage discharge in a plasma source, this plasma is brought into contact with the surface of the rubber item by means of a plasma nozzle, and the plasma source is moved within a distance of from 2 to 25 mm with a velocity of from 0.1 m/min to 400 m/min relative to the surface of the rubber item. 
     
     
         17 . The process according to  claim 10 , wherein the plasma-treatment time is from 1 ms to 100 s. 
     
     
         18 . The process according to  claim 10 , wherein the Shore A hardness of the thermoplastic polyurethane is smaller than 95 and the thermoplastic polyurethane comprises no plasticizers. 
     
     
         19 . The process according to  claim 10 , wherein the Shore hardness of the thermoplastic polyurethane is from 45 A to 80 A, its tensile strength to DIN 53504 is greater than 15 MPa, its tear propagation resistance to DIN 53515 is greater than 30 N/mm, and its abrasion value to DIN 53516 is smaller than 250 mm 3 .