Resinous tube

Abstract

A resinous tube which has a low permeability for alcohol-contained fuel in addition to usual gasoline and is sufficiently high in adhesiveness between a barrier layer (permeation-interrupting layer) and a protecting layer (layer covering the permeation-interrupting layer), is easy in reuse of marginal materials and the like, and is a low cost material arrangement is furnished. This resinous tube is formed by laminating pipe-shaped resin layers, in which a main component of at least one layer of layers constituting the tube is a resin such as PBT, PBN, PET, PEN or the like, and a main component of a layer other than the above-mentioned layer is PBT copolymer. The PBT copolymer contains an acid component and a glycol component.

1 . A resinous tube formed by laminating pipe-shaped resinous layers, 
 characterized in that a main component of at least one layer of layers constituting said tube is at least one resin selected from the group consisting of PBT, PBN, PET and PEN, and a main component of a layer other than said layer is PBT copolymer.    
     
     
         2 . A resinous tube as claimed in  claim 1 , characterized in said PBT copolymer further contains at least one of PBT and PBN.  
     
     
         3 . A resinous tube as claimed in  claim 1 , characterized in that said PBT copolymer is polyester-ether block copolymer elastomer having a hard segment formed of PBT and a soft segment formed of polyether.  
     
     
         4 . A resinous tube as claimed in  claim 3 , characterized in that said polyether is polytetramethylene glycol.  
     
     
         5 . A resinous tube as claimed in  claim 1 , characterized in that said PBT copolymer is polyester-ester block copolymer elastomer having a hard segment formed of PBT and a soft segment formed of polyester.  
     
     
         6 . A resinous tube as claimed in  claim 5 , characterized in that said polyester is polycaprolactone.  
     
     
         7 . A resinous tube as claimed in  claim 1 , characterized in that said PBT copolymer includes copolymerized polyester as a main constituting component, the copolymerized polyester containing one of terephthalic acid and ester-formable derivative of the terephthalic acid and one of hydrogenated dimer acid and ester-formable derivative of the hydrogenated dimer acid as an acid component, and 1, 4-butanediol as a glycol component.  
     
     
         8 . A resinous tube as claimed in  claim 7 , characterized in that said acid component contains a copolymer composition of said hydrogenated dimer acid in a rate ranging from 3 to 30 mole %.  
     
     
         9 . A resinous tube as claimed in  claim 1 , characterized in that a layer of said PBT copolymer has a thickness within a rate ranging from 40 to 90% of that of whole the layers.  
     
     
         10 . A resinous tube as claimed in  claim 2 , characterized in that said PBT copolymer is polyester-ether block copolymer elastomer having a hard segment formed of PBT and a soft segment formed of polyether.  
     
     
         11 . A resinous tube as claimed in  claim 10 , characterized in that said polyether is polytetramethylene glycol.  
     
     
         12 . A resinous tube as claimed in  claim 2 , characterized in that said PBT copolymer is polyester-ester block copolymer elastomer having a hard segment formed of PBT and a soft segment formed of polyester.  
     
     
         13 . A resinous tube as claimed in  claim 12 , characterized in that said polyester is polycaprolactone.  
     
     
         14 . A resinous tube as claimed in  claim 2 , characterized in that said PBT copolymer includes copolymerized polyester as a main constituting component, the copolymerized polyester containing one of terephthalic acid and ester-formable derivative of the terephthalic acid and one of hydrogenated dimer acid and ester-formable derivative of the hydrogenated dimer acid as an acid component, and 1, 4-butanediol as a glycol component.  
     
     
         15 . A resinous tube as claimed in  claim 14 , characterized in that said acid component contains a copolymer composition of said hydrogenated dimer acid in a rate ranging from 3 to 30 mole %.  
     
     
         16 . A resinous tube as claimed in  claim 2 , characterized in that a layer of said PBT copolymer has a thickness within a rate ranging from 40 to 90% of that of whole the layers.  
     
     
         17 . A resinous tube formed by laminating pipe-shaped resinous layers, said resinous tube comprising: 
 a covering layer formed of resin which contains as a main component at least one resin selected from the group consisting of PBT, PBN, PET and PEN; and    a permeation-interrupting layer covered with said covering layer and formed of resin which contains as a main component PBT copolymer.    
     
     
         18 . A resinous tube as claimed in  claim 17 , in which an outer surface of said permeation-interrupting layer is in tight contact with an inner surface of said covering layer so that no other layer exists between said permeation-interrupting layer and said covering layer.