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US 5,178,958 AGranted
Undercoat composition
AssigneeSekisui Kagaku Kogyo Kabushiki Kaisha
InventorsToshimi Inai, Naofumi Imahigashi, Koichi Karukaya, Koji Motoi
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Abstract
An undercoat composition for a powder coating of a heat-resistant resin on a metal substrate at a high coating temperature wherein the composition includes a specific imide prepolymer.
Claims12
A coated metal substrate, comprising:
- a metal substrate;
- an upper layer of resin material formed by powder-coating the resin material on the metal substrate;
- and
- an undercoating layer formed by an undercoating composition between the metal substrate and the upper layer;
- wherein the undercoating composition comprises:
- an undercoating resin material comprised of the resin material of the upper layer;
- the undercoating resin material being selected from the group consisting of tetrafluoroethylenehexafluoroprophylene copolymer (FEP), perfluoroalkoxy resin (PFA), polyphenylene-sulfide (PPS), ethylenetetrafluoroethylene copolymer (ETFE), polyetheretherketone (PEEK), polyetherketone (PEK), nylon (NY), polyethersulfone (PES), polysulfone (PSF), polyarylate (PAR) and polyetherimede (PEI);
- and
- an imide prepolymer obtained by the reaction of tetracarboxylic acid, aromatic diamine, and unsaturated acid anhydride wherein the imide prepolymer has the following general structure formula:
- ##STR6## wherein R.sub.1 is an aromatic tetracarboxylic acid residue;
- R.sub.2 is an aromatic diamine residue;
- R.sub.3 is an unsaturated acid anhydride residue which does not include an acetyl group;
- and
- l is an integer and the mean value of l is within the range of 0 to 5 and
- wherein the ratio of the imide prepolymer to the undercoating resin material is from 10:90 to 90:10 by weight.
12 more elements
Dependencies are inferred from the claim text.