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US 9,181,463 B2Granted
Structural epoxy resin adhesives containing chain-extended elastomeric tougheners capped with phenol, polyphenol or aminophenol compounds
AssigneeDow Global Technologies LLC
InventorsAndreas Lutz, Daniel Schneider, Christof Braendli, Irene Maeder
Life of this patent
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Abstract
Structural adhesives are prepared from a chain extended elastomeric toughener that contains urethane and/or urea groups, and have terminal isocyanate groups that are capped with a phenol, a polyphenol or an aminophenol compound. The adhesives have very good storage stability and cure to form cured adhesives that have good lap shear and impact peel strengths.
Claims14
A one-part structural adhesive comprising:
- A) at least one epoxy resin;
- B) a reactive elastomeric toughener containing capped isocyanate groups;
- and
- C) one or more epoxy curing agents;
- wherein all reactive elastomeric tougheners containing capped isocyanate groups present in the one-part structural adhesive are formed by
- a) reacting an excess of a polyisocyanate with a 300-3000 equivalent weight polyol or with a mixture of a 300-3000 equivalent weight polyol and a branching agent, to form an isocyanate-terminated prepolymer;
- b) reacting the isocyanate-terminated prepolymer with a chain extender to produce a chain extended, isocyanate-terminated prepolymer, and
- c) capping 100% of the terminal isocyanate groups of the chain extended, isocyanate-terminated prepolymer with a capping agent selected from a monophenol, a polyphenol and an aminophenol.
5 more elements
A one-part structural adhesive comprising:
- A) at least one epoxy resin;
- B) a reactive elastomeric toughener containing capped isocyanate groups;
- and
- C) one or more epoxy curing agents;
- wherein all reactive elastomeric tougheners containing capped isocyanate groups present in the one-part structural adhesive are formed by
- a) reacting an excess of 1,6-hexamethylene diisocyanate with a 300-3000 equivalent weight polytetrahydrofuran, to form an isocyanate-terminated prepolymer;
- b) reacting the isocyanate-terminated prepolymer with o,o′-diallylbisphenol A to produce a chain extended, isocyanate-terminated prepolymer, and
- c) capping 100% of the terminal isocyanate groups of the chain extended, isocyanate-terminated prepolymer with a capping agent selected from o,o′-diallylbisphenol A and allylphenol.
5 more elements
Dependencies are inferred from the claim text.