Low Organic Vapor Permeation Resin Composition

Abstract

The invention relates to a novel composition comprising at least one polyphthalamide reactively extruded with at least one other polyamide, a polyester, and a modifier. The composition can be further modified with fillers to add increased strength. Other additives such as colorants, flame retardants, and UV degradation inhibitors are also contemplated. This composition exhibits superior barrier to organic vapors, impact strength and heat distortion temperatures. Also disclosed are articles using this novel composition such as fuel tanks for gasoline engines used to power lawn mowers and garden machinery.

1 . A container for organic liquids having a contained volume wherein said container is a fuel tank comprised of at least one wall, an inlet, an outlet, wherein the wall is comprised of a thermoplastic composition which includes an aromatic polyester selected from the group consisting of polybutylene terephthalate, polyethylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate and copolymers thereof, a first polyamide which is a polyphthalamide, a compatibilizer having at least one functional group selected from the group consisting of hydroxyl groups, carboxylic acid groups, glycidyl groups, maleic anhydride groups, amino groups, siloxane groups or isocyanato groups and a second polyamide selected from the group consisting of aliphatic polyamides and partially aromatic polyamides; wherein the aromatic polyester is present at a level within the range of 3 weight percent to 30 weight percent on the basis of the polyphthalamide, the second polyamide, the polyester and the compatibilizer; wherein the second polyamide is present at a level within the range of 40 to 75 weight percent on the basis of the polyphthalamide, the second polyamide, the polyester and the compatibilizer and wherein the polyphthalamide is present at level of at least 3 weight percent on the basis of the polyphthalamide, the second polyamide, the polyester and the compatibilizer. 
     
     
         2 . The container of  claim 1 , wherein the wall of the container is of a monolayer construction. 
     
     
         3 . The container of  claim 1 , wherein the inlet is capable of receiving a cap. 
     
     
         4 . The container of  claim 2 , wherein the inlet is capable of receiving a cap. 
     
     
         5 . The container of  claim 1 , wherein the container is manufactured by blow molding. 
     
     
         6 . The container of  claim 1 , wherein the container is manufactured by rotational molding. 
     
     
         7 . The container of  claim 1 , wherein the container is manufactured by injection molding. 
     
     
         8 . The container of  claim 1 , wherein the container has a weld seam. 
     
     
         9 . The container of  claim 1 , wherein the container has a seam where the two halves of the mold used to make the container have come together. 
     
     
         10 . The container of  claim 2 , wherein the container is manufactured by blow molding. 
     
     
         11 . The container of  claim 2 , wherein the container is manufactured by rotational molding. 
     
     
         12 . The container of  claim 2 , wherein the container is manufactured by injection molding. 
     
     
         13 . The container of  claim 2 , wherein the container has a weld seam. 
     
     
         14 . The container of  claim 2 , wherein the container has a seam where the two halves of the mold used to make the container have come together. 
     
     
         15 . The container of  claim 4 , wherein the container is manufactured by blow molding. 
     
     
         16 . The container of  claim 4 , wherein the container is manufactured by rotational molding. 
     
     
         17 . The container of  claim 4 , wherein the container is manufactured by injection molding. 
     
     
         18 . The container of  claim 4 , wherein the container has a weld seam. 
     
     
         19 . The container of  claim 4 , wherein the container has a seam where the two halves of the mold used to make the container have come together.