Blocked polyurethane tougheners for epoxy adhesives
AssigneeDdp Specialty Electronic Materials US, LLC
InventorsAndreas Lutz, Daniel Schneider, Bindu Krishnan, Tyler Auvil
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Abstract
The invention is directed to a toughener for epoxy adhesives, the toughener being a reaction product of a bisphenolic blocked PU toughener with a diglycidyl ether-bisphenol product such as liquid DGEBA. The invention includes adhesives comprising the inventive tougheners, methods of using the tougheners and adhesives comprising them, as well as cured inventive adhesives and products comprising them.
Claims17
A toughener for an epoxy adhesive composition comprising a reaction product of:
- a) a first reaction product of an prepolymer with isocyanate terminal groups, comprising the reaction product of a polyether diol and/or a polybutadiene diol-based polymer and an isocyanate, and a capping compound selected from the group consisting of resorcinol, catechol, hydroquinone, biphenyl-4,4 diol, bisphenol A, bisphenol B, Bisphenol C, Bisphenol E, bisphenol AP (1,1-bis(4-hydroxylphenyl)-1-phenyl ethane), bisphenol F, bisphenol K, bisphenol M, tetramethylbiphenol and o,o′-diallyl-bisphenol A, wherein the first reaction product is terminated with the capping compound, wherein the resorcinol, catechol, hydroquinone, biphenyl-4,4 diol, bisphenol A, bisphenol B, Bisphenol C, Bisphenol E, bisphenol AP (1,1-bis(4-hydroxylphenyl)-1-phenyl ethane), bisphenol F, bisphenol K, bisphenol M, tetramethylbiphenol and/or o,o′-diallyl-bisphenol A are the only capping compound(s) on the first reaction product;
- b) a diglycidyl bisphenol epoxy resin;
- and
- c) a catalyst quenching agent;
- wherein the ratio of the capping compound equivalents to the prepolymer equivalents is about 1-2.5:1;
- and
- wherein the first reaction product consists essentially of all-capped isocyanate terminal groups of the prepolymer.
A toughener for an epoxy adhesive composition comprising a reaction product of:
- a) an isocyanate terminated prepolymer comprising the reaction product of a polyether diol and/or a polybutadiene diol-based polymer and an isocyanate;
- b) a capping compound selected from the group consisting of resorcinol, catechol, hydroquinone, biphenyl-4,4 diol, bisphenol A, bisphenol B, Bisphenol C, Bisphenol E, bisphenol AP (1,1-bis(4-hydroxylphenyl)-1-phenyl ethane), bisphenol F, bisphenol K, bisphenol M, tetramethylbiphenol and o,o′-diallyl-bisphenol A,
- wherein the resorcinol, catechol, hydroquinone, biphenyl-4,4 diol, bisphenol A, bisphenol B, Bisphenol C, Bisphenol E, bisphenol AP (1,1-bis(4-hydroxylphenyl)-1-phenyl ethane), bisphenol F, bisphenol K, bisphenol M, tetramethylbiphenol and/or o,o′-diallyl-bisphenol A are the only capping compound(s) on the first reaction product;
- wherein the ratio of the capping compound equivalents to the prepolymer equivalents is about 1-2.5:1;
- c) a diglycidyl bisphenol epoxy resin;
- and
- d) a catalyst quenching agent.
A composition suitable for use as a toughener in an epoxy adhesive composition, the composition comprising an epoxy terminated polyurethane coupled via resorcinol, catechol, hydroquinone, biphenyl-4,4 diol, bisphenol A, bisphenol B, Bisphenol C, Bisphenol E, bisphenol AP (1,1-bis(4-hydroxylphenyl)-1-phenyl ethane), bisphenol F, bisphenol K, bisphenol M, tetramethylbiphenol or o,o′-diallyl-bisphenol A and a catalyst quenching agent, wherein the resorcinol, catechol, hydroquinone, biphenyl-4,4 diol, bisphenol A, bisphenol B, Bisphenol C, Bisphenol E, bisphenol AP (1,1-bis(4-hydroxylphenyl)-1-phenyl ethane), bisphenol F, bisphenol K, bisphenol M, tetramethylbiphenol and/or o,o′-diallyl-bisphenol A are the only capping compound(s) coupled to the epoxy terminated polyurethane.
Dependencies are inferred from the claim text.