Flame activated primer for polyolefinic coatings
First Claim
1. A coating system comprisinga. a primer composition, and b. a thermoplastic coating deposited on the primer composition forming a top coat, wherein the primer composition comprises an epoxy resin cured by a combination of at least one fast acting reactive amine curing agent which has entered into cross-linking reactions with the epoxy resin to provide the partial cure of the epoxy resin, and at least one amine curing agent which has been flame or heat activated to remove a blocking of the amine functionality and which has further caused a complete cure of the epoxy resin, by either stoichiometric reaction or catalysis.
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Accused Products
Abstract
A primer for flame sprayed polyolefin comprises an epoxy resin, preferably of low molecular weight and/or low viscosity; and an amine hardener, part of which becomes highly reactive on exposure to open flame, providing near instant cure of the composition under flame spray conditions. The invention is unique that it provides strong adhesion to steel, even where the surface preparation is less than ideal, as well as to concrete and other substrates. The primer eliminates the need to preheat the substrate. The primer has strong adhesion to the topcoat polyolefinic material, especially to a functionalized topcoat. The composition withstands open flame and does not char under polyolefin flame spray conditions, nor does it run or sag, and it is not prone to failure as it cools after the application of the polyolefin.
25 Citations
39 Claims
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1. A coating system comprising
a. a primer composition, and b. a thermoplastic coating deposited on the primer composition forming a top coat, wherein the primer composition comprises an epoxy resin cured by a combination of at least one fast acting reactive amine curing agent which has entered into cross-linking reactions with the epoxy resin to provide the partial cure of the epoxy resin, and at least one amine curing agent which has been flame or heat activated to remove a blocking of the amine functionality and which has further caused a complete cure of the epoxy resin, by either stoichiometric reaction or catalysis.
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8. A primer composition capable of being flame activated comprising
a. an epoxy resin having terminal epoxy groups, b. a fast acting amine curing agent for reacting with terminal epoxy groups of the epoxy resin and partially curing the composition; - and
c. an amine curing agent capable of being flame activated and having blocked amine functionality for stoichiometric or catalytic reaction of the remaining portion of the terminal epoxy groups upon being activated and providing a complete cure of the curable primer compositions, wherein a sufficient amount of the fast acting amine is present to react with in the range of from about 10% to about 90% of the terminal epoxy groups of the epoxy resin. - View Dependent Claims (9, 10, 11, 12)
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13. An amine curing agent comprising
a. at least one fast acting amine curing agent for reactively crosslinking terminal functional groups of an epoxy resin, and b. at least one amine curing agent capable of being flame activated and having blocked amine functionality for reacting with or catalyzing reaction of terminal epoxy groups of an epoxy resin after activation by flame.
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19. A primed substrate comprising
a. a substrate, and b. a partly cured curable primer composition on the substrate, wherein said primer composition comprises i. an epoxy resin having both reactive terminal epoxy groups and reacted terminal epoxy groups, wherein the reacted terminal epoxy groups have been reacted with a fast acting amine curing agent to provide the partial cure of the partly cured primer composition, and ii. an amine curing agent capable of being flame activated and having blocked amine functionality for reacting with or catalyzing reaction of the reactive terminal epoxy groups of the epoxy resin upon being activated by flame so as to provide a complete and near instantaneous cure of the curable primer composition.
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24. A method for coating a substrate, said method comprising
a) providing a substrate surface which is substantially free of loose, unsound, poorly adhered, contaminated and/or detrimental matter including oils and grease; -
b) applying a layer of primer to said substrate surface, said primer comprising i. an epoxy resin having terminal epoxy groups, ii. a fast acting amine curing agent for reacting with a first portion of the terminal epoxy groups of the epoxy resin and partially curing the curable composition; and
iii. an amine curing agent capable of being flame activated and having blocked amine functionality for reacting with or catalyzing reaction of a second portion of the terminal epoxy groups upon being activated and providing a complete cure of the curable primer composition; and
c) flame spraying a layer of molten thermoplastic resin onto the layer of primer under conditions to activate the amine curing agent capable of being flame activated and provide a complete cure of the primer. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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33. A coated substrate comprising
a. a substrate, b. a primer composition deposited on the substrate, and c. a thermoplastic coating deposited on the primer composition, wherein the primer composition comprises an epoxy resin cured by a combination of at least one fast acting reactive amine curing agent which has entered into cross-linking reactions with the epoxy resin to provide the partial cure of the epoxy resin, and at least one amine curing agent which has been flame activated to remove a physical or electronic blocking of the amine functionality and which has further caused a complete cure of the epoxy resin, by either stoichiometric reaction or catalysis.
Specification