Fuel tank accessory and method for producing a fuel tank accessory

Abstract

The invention relates to a fuel tank accessory, consisting of a mixture of a first plastics material (A) and a second plastics material (B), wherein the first and the second plastics material are immiscible, wherein the mixture contains a compatibiliser for rendering the first and second plastics materials miscible, wherein the first plastics material is a fuel resistant plastics material and wherein the second plastics material is a non-fuel resistant plastics material. The fuel tank accessory is a spout, in particular a filler spout, or a valve, in particular a tank venting valve, or a cover element, wherein the fuel tank accessory is integrally moulded from the mixture.

What is claimed is: 
     
         1 . A fuel tank accessory composed of a mixture of a first plastic and a second plastic, whereby the first plastic and the second plastic are immiscible, whereby the mixture contains a compatibilizer for making the first and second plastics miscible, whereby the first plastic is a fuel-resistant plastic, and whereby the second plastic is a non-fuel-resistant plastic, whereby the fuel tank accessory is selected from one or more of the following: a spout, a valve, and a cover element, whereby the fuel tank accessory is molded in one piece from the mixture. 
     
     
         2 . The fuel tank accessory according to  claim 1 , whereby the compatibilizer is a copolymer of the first and second plastics. 
     
     
         3 . The fuel tank accessory according to  claim 2 , whereby the proportion of the copolymer in the mixture is at most 30 wt. %. 
     
     
         4 . The fuel tank accessory according to  claim 2 , whereby the copolymer is a grafted copolymer. 
     
     
         5 . The fuel tank accessory according to  claim 2 , whereby the copolymer features an additional compatibilizer. 
     
     
         6 . The fuel tank accessory according to  claim 1 , whereby the first plastic is a polyamide. 
     
     
         7 . The fuel tank accessory according to  claim 1 , whereby the second plastic is a polyethylene or polypropylene. 
     
     
         8 . The fuel tank accessory according to  claim 1 , whereby the proportion of the first plastic in the mixture is smaller than the proportion of the second plastic. 
     
     
         9 . The fuel tank accessory according to  claim 8 , whereby the proportion of the first plastic is a maximum of 40 wt. %. 
     
     
         10 . The fuel tank accessory according to  claim 1 , whereby the fuel tank accessory is developed in a first region for an integral bond with a second region, whereby the second region is located on an outer wall of a fuel tank. 
     
     
         11 . The fuel tank accessory according to  claim 10 , whereby the second region features the second plastic. 
     
     
         12 .- 23 . (canceled) 
     
     
         24 . A fuel tank, with at least one fuel tank accessory according to  claim 1 , whereby the fuel tank accessory is integrally connected to an outer wall of the fuel tank. 
     
     
         25 . A method for producing a fuel tank system, comprising:
 Producing an accessory from a mixture of a first plastic with a second plastic, whereby the mixture contains a compatibilizer to make the first and second plastics miscible, whereby the second plastic is not fuel-resistant;   Integral bonding of the accessory with a wall of a fuel tank.   
     
     
         26 . The method according to  claim 25 , whereby the compatibilizer is a copolymer of the first and second plastics. 
     
     
         27 .- 29 . (canceled) 
     
     
         30 . The method according to  claim 25 , whereby a joining surface of the accessory undergoes a pre-treatment prior to integral bonding, said pre-treatment comprising one or more of the following measures:
 plasma treatment,   plasma coating,   flame treatment,   chemical etching,   mechanical pre-treatment.   
     
     
         31 . The method according to  claim 25 , whereby the integral bonding is created by welding. 
     
     
         32 . The method according to  claim 25 , whereby the fuel tank accessory is produced using a plastic injection molding method. 
     
     
         33 . The method according to  claim 26 , whereby an additional compatibilizer is used to produce the copolymer, which is added to a mixture of the first and second plastics in solid or liquid form, and which is at least partially used up during copolymerization. 
     
     
         34 . The method according to  claim 33 , whereby the additional compatibilizer contains one or more of the following: reactive isocyanate groups, oligomers with epoxy groups and (maleic acid) anhydride groups or oxazoline groups. 
     
     
         35 . The fuel tank accessory according to  claim 1 , whereby the first plastic is selected from one or more of the following: polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide T, polyoxymethylene, polyester, polyacetate, polyolefin, fluorothermoplastic, fluoropolymer, and polyphenylene sulfide.