Laminated resin formed body, method for producing laminated resin formed body, and multilayer article

Abstract

It is an object of the present invention to provide a laminated resin molding which comprises a layer of a thermoplastic polymer such as a thermoplastic elastomer and a layer of a thermoplastic resin such as a fluorine-containing ethylenic polymer, is excellent in liquid chemical impermeability, chemical resistance and bacteria resistance, among others, and can be molded by coextrusion without causing foaming or deterioration of the thermoplastic elastomer and, further, has good interlaminar adhesive strength. The invention provides a laminated resin molding comprising a thermoplastic polymer layer (A), a polyamide-based resin layer (B) and a thermoplastic resin layer (C), wherein said thermoplastic polymer layer (A), said polyamide-based resin layer (B) and said thermoplastic resin layer (C) are laminated in that order and firmly adhered to one another, said thermoplastic polymer is to adhere to the polyamide-based resin by thermal fusion bonding, said polyamide-based resin has an amine value of 10 to 60 (equivalents/10 6 g), said thermoplastic resin contains a functional group and is to thereby firmly adhere to said polyamide-based resin by thermal fusion bonding, said functional group contains carbonyl group.

1 - 15 . (canceled) 
   
   
       16 . A laminated resin molding comprising a thermoplastic polymer layer (A), a polyamide-based resin layer (B) and a thermoplastic resin layer (C), wherein said thermoplastic polymer layer (A), said polyamide-based resin layer (B) and said thermoplastic resin layer (C) are laminated in that order and firmly adhered to one another, said thermoplastic polymer is to adhere to the polyamide-based resin by thermal fusion bonding and comprises a fluorine-containing ethylenic polymer,
 said polyamide-based resin has an amine value of 10 to 60 (equivalents/10 g), said thermoplastic resin contains a functional group, is to thereby firmly adhere to said polyamide-based resin by thermal fusion bonding and comprises a fluorine-containing ethylenic polymer,   said functional group contains carbonyl group.   
   
   
       17 . The laminated resin molding according to  claim 16  wherein the fluorine-containing ethylenic polymer is (II) copolymers obtained by polymerizing at least tetrafluoroethylene and a compound represented by the general formula (ii):
   CF 2 ═CF—Rf 1   (ii)   wherein Rf 1  represents CF 3  or ORf 2  and Rf 2  represents a perfluoroalkyl group containing 1 to 5 carbon atoms or   (IV) copolymers derived from at least the following a, b and c:   a. 20 to 89 mole percent of tetrafluoroethylene,   b. 10 to 79 mole percent of ethylene, and   c. 1 to 70 mole percent of a compound represented by the general formula (ii):
   CF 2 ═CF—Rf 1   (ii) 
   
     wherein Rf 1  represents CF 3  or ORf 2  and Rf 2  represents a perfluoroalkyl group containing 1 to 5 carbon atoms. 
   
   
       18 . The laminated resin molding according to  claim 16 , wherein the polyamide-based resin has an acid value of not higher than 80 equivalents/10 6  g. 
   
   
       19 . A method for producing the laminated resin molding according to  claim 16 , which comprises laminating by the simultaneous multilayer coextrusion technique using a coextruding machine comprising a die and a plurality of extruders each for feeding a resin to said die,
 said die temperature being higher than 250° C. and not higher than 300° C.   
   
   
       20 . A multilayer molded article comprising the laminated resin molding according to  claim 16 . 
   
   
       21 . The multilayer molded article according to  claim 20  which is a hose or a tube. 
   
   
       22 . The multilayer molded article according to  claim 20  which is a tube to be buried underground in a gas station. 
   
   
       23 . The multilayer molded article according to  claim 20  which is an inner tube or an outer tube of a duplex tube.