Storage-stable compositions useful for the production of structural foams
First Claim
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1. A storage-stable foamable composition comprised of:
- (a) one or more epoxy resins selected from the group costing of liquid and semi-solid glycidyl ethers of polyhydric phenols having an average of about two epoxy groups per molecule. (b) one or more blowing agents, wherein at least one blowing agent is azodicarbonamide; and
(c) one or more curatives, wherein a least one curative is an amine-epoxy adduct;
wherein said composition is a pliable dough.
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Abstract
Foamable compositions based on epoxy resins which exhibit good shelf life are obtained through the use of specific blowing agent and curing accelerator systems. The blowing agent system contains azodicarbonamide, while the curative system contains an amine-epoxy adduct such as an imidazole-epoxy adduct. The compositions are capable of providing structural foams which are useful in the manufacture of reinforced structural members and the like.
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Citations
25 Claims
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1. A storage-stable foamable composition comprised of:
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(a) one or more epoxy resins selected from the group costing of liquid and semi-solid glycidyl ethers of polyhydric phenols having an average of about two epoxy groups per molecule. (b) one or more blowing agents, wherein at least one blowing agent is azodicarbonamide; and
(c) one or more curatives, wherein a least one curative is an amine-epoxy adduct;
wherein said composition is a pliable dough. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A storage-stable foamable dough comprised of:
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(a) from about 35 to about 85 weight % total of one or more epoxy resins, wherein at least one of said epoxy resins is a glycidyl ether of a polyhydric phenol which has an average of about two epoxy groups per molecule and which is liquid or semi-solid at room temperate;
(b) from about 0.1 to about 5 weight % total of one or more blowing agents, wherein at least one blowing agent is azodicarbonamide; and
(c) from about 0.1 to about 10 weight % total of one or more curatives, wherein at least one curative is an imidazole-epoxy adduct and at least one curative is a guanidine;
(d) from about 5 to 60 weight % total of one or more fillers, wherein hollow glass microspheres are utilized as at last one of said fillers; and
(e) optionally, one or more additional additives selected from the group consisting of adhesion promoters, flexibilizing/toughening agents, colorants, stabilizers, and blowing agent accelerators. - View Dependent Claims (16, 17, 18)
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19. A storable-stable foamable dough comprised of:
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(a) one or more epoxy resins, at last one of said epoxy resins being a liquid glycidyl ether of bisphenol A having an epoxide equivalent weight of from about 150 to 1000 and an average of about 2 epoxy groups per molecule;
(b) one or more blowing agents, wherein azodicarbonamide comprises at least about 80% by weight of said blowing agents;
(c) two or more curatives, wherein at least one curative is an imidazole-epoxy adduct and at least one curative is dicyandiamide;
(d) one or more fillers, wherein hollow glass microspheres are utilized as at least one of said fillers and comprise from about 5 to about 50 weight % of the foamable dough;
(e) one or more adhesion promoters;
(f) one or more flexibilizing/toughening agents; and
(g) one or more blowing agent accelerators. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification