Fuel impervious polymeric article
AssigneeHuels Aktiengesellschaft
InventorsErnst Gerdes, Friedhelm Mutzberg, Franz Pellengahr
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Abstract
The permeability of polymeric articles, particularly fuel tanks and fuel canisters is substantially reduced by thin varnish coatings comprising an epoxy resin, an amine containing curing agent and a flexibilizer.
Claims21
A coated polymeric article having reduced permeability to fuels, comprising a polymer substrate coated with a cured varnish agent comprising:
- (a) an effective amount of an epoxy resin based on a monomer having at least two epoxy groups and having an epoxy equivalent weight of about 150-280;
- and
- (b) an effective amount of a curing agent comprising an amine
- H.sub.2 N--CH.sub.2 --R.sub.1 --NH.sub.2, or (I)
- H.sub.2 N--R.sub.2 --CH.sub.2 --R.sub.3 --NH.sub.2 ;
- (II)
- wherein R.sub.1, R.sub.2 and R.sub.3 are each, independently, substituted alkylene or cycloalkylene of 5-10 carbons, the amine having a molecular weight of about 100 to 200.
A method for production of a coated polymeric article without application of a primer or an adhesion promoter, comprising
- (A) subjecting the surface of said article to be coated to flame treatment sufficient to raise the temperature of said surface to at least 60.degree. C.;
- and
- (B) applying to the article a varnish agent comprising:
- (a) an effective amount of an epoxy resin based on a monomer having at least two epoxy groups and having an epoxy equivalent weight of about 150-280;
- and
- (b) an effective amount of a curing agent comprising an amine
- H.sub.2 N--CH.sub.2 --R.sub.1 --NH.sub.2, or (I)
- H.sub.2 N--R.sub.2 --CH.sub.2 --R.sub.3 --NH.sub.2 ;
- (II)
- wherein R.sub.1, R.sub.2 and R.sub.3 are each;
- independently, substituted alkylene or cycloalkylene of 5-10 carbons, the amine having a molecular weight of about 100 to 200 without use of a primer or an adhesive promotor.
A method of increasing the resistance of a polymer to permeation by gasoline-type fluids comprising coating the polymer with a coating agent comprising:
- (a) a epoxy resin based on a monomer having at least two epoxy groups and having an epoxy equivalent weight of about 150-280;
- (b) an effective amount of a curing agent containing at least one of (I) or (II)
- H.sub.2 N--CH.sub.2 --R.sub.1 --NH.sub.2, (I)
- H.sub.2 N--R.sub.2 --CH.sub.2 --R.sub.3 --NH.sub.2 ;
- (II)
- wherein R.sub.1, R.sub.2 and R.sub.3 each independently is substituted alkylene or cycloalkylene of 5-10 carbons having a molecular weight of about 100 to 200, and
- (c) an effective amount of flexibilizer based on an isocyanate prepolymer,
- and curing the coated article.
Dependencies are inferred from the claim text.