Color indicating epoxy resins and methods thereof
Assignee3M Innovative Properties Company
InventorAdrian T. Jung
Life of this patent
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Abstract
Described herein is an epoxy composition comprising: a first component comprising an amine-based curing agent and a first dye, having a first color; and a second component comprising a curable epoxy resin and a second dye, having a second color. Also described herein is a shelf-life-indicating composition comprising: an amine-based curing agent; and a dye selected from (i) a cationic triarylmethane dye, wherein the cationic triarylmethane dye reversibly reacts with a primary amine; (ii) a halochromic dye having a color transition range between 7-12 when measured in an aqueous solution; or (iii) combinations thereof.
Claims36
An epoxy composition comprising:
- a first component comprising an amine-based curing agent and a first dye, wherein the first component has a first color;
- and a second component comprising a curable epoxy resin and a second dye, wherein the second component has a second color.
The composition according to any one of the proceeding claims, wherein the first component and the second component are mixed to form a mixture and wherein the mixture has a third color.
The composition according to any one of the previous claims wherein the first dye is at least one of a triarylmethane compound, an azo compound, and combinations thereof.
The composition according to any one of the previous claims wherein the second dye is at least one of a triarylmethane compound, an azo compound, and combinations thereof.
The composition according to any one of the previous claims wherein at least one of the first dye and the second dye is a cationic triarylmethane compound.
The composition according to any one of the previous claims, wherein the amine-based curing agent is selected from the formula:
- R1R2N—R3—NR4H (I)
- wherein R1, R2 and R4 represent, independently from each other, hydrogen, a linear or branched alkyl or a linear or branched polyoxyalkyl moiety.
The composition according to any one of the previous claims, wherein the curable epoxy resin comprises the reaction product of bisphenol A with epichlorohydrin.
A 2-component epoxy comprising:
- a first component comprising an amine-based curing agent and a first halochromic dye, wherein the first halochromic dye has a first color transition range and a second component comprising a curable epoxy resin comprising a second halochromic dye and having a second color transition range.
A shelf-life indicating composition comprising:
- an amine-based curing agent;
- and a dye selected from (i) a cationic triarylmethane dye, wherein the cationic triarylmethane dye reversibly reacts with a primary amine;
- (ii) a halochromic dye having a color transition range between 7-12 when measured in an aqueous solution;
- or (iii) combinations thereof.
A method of indicating mixing and curing of a 2-component epoxy composition comprising:
- mixing a first component comprising an amine-based curing agent and a first dye and having a first color with a second component comprising a curable epoxy resin and a second dye and having a second color to form a third color and allowing the mixture to cure to form a fourth color, wherein each of the first, second, third, and four colors are visually different in color.
Dependencies are inferred from the claim text.