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US 6,274,682 B1Granted
Epoxy resin system
OwnerLarry Steven Corley, Martin L. Ehrlichinventors
Life of this patent
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Abstract
An epoxy resin composition containing a) an epoxy resin and b) a liquid amine terminated polyamide curing agent prepared by condensing an aminoalkylpiperazine and a dicarboxylic acid. The epoxy resin composition typically requires less than 35% of solvent to produce a sprayable viscosity. The cured epoxy composition has good flexibility. A hydroxy-functional flexibilized resin is also produced by reacting (a) an epoxy resin, (b) a liquid aminoalkylpiperazine-based amine terminated polyamide and (c) a hydroxy-functional amine.
Claims6
A hydroxy-functional resin produced by reacting:
- (a) an epoxy resin(s) having at least 1.5 epoxy groups per molecule;
- (b) a liquid amine terminated polyamide prepared by reacting at least one C18-50 dicarboxylic acid, dicarboxylic acid ester or dicarboxylic acid chloride with an aminoalkylpiperazine in a ratio of moles of aminoalkylpiperazine to equivalents of carboxyl group in the acid of greater than 0.75:1;
- wherein the aminoalkylpiperazine is of the formula:
- wherein R1 is hydrogen and R2 is —R3—NH2, wherein R3 is a divalent aliphatic linkage with optional —CHR4— or —CR4R5— units, wherein R4 and R5 are independently alkyl groups, wherein the molar ratio of the epoxy resin to said liquid amine terminated polyamide is from about 3:1 to about 1:3;
- and
- (c) a hydroxy-functional amine, wherein the equivalents ratio of amine hydrogen to said epoxy groups is within the range of from about 1:2 to about 2:1.
3 more elements
Dependencies are inferred from the claim text.