Anaerobic compositions with enhanced toughness and crack resistance
AssigneeHenkel Loctite Corporation
InventorsShabbir Attarwala, Richard D. Rich, Natalie R. Li
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Abstract
An anaerobic adhesive composition having enhanced toughness and resistance to crack propagation, particularly subsequent to thermal exposure, comprising a combination of three monomers consisting of (a) at least one (meth) acrylate monomer, (b) at least one (meth)acrylate-terminated urethane modified acrylonitrile/butadiene prepolymer, and (c) at least one (meth)acrylate-terminated acrylic/polyisocyanate adduct.
Claims16
An anaerobic adhesive composition, the reaction products of which demonstrate enhanced toughness and resistance to crack propagation, comprising:
- (a) at least one (meth)acrylate monomer component;
- (b) at least one (meth)acrylate-terminated monomeric prepolymer component comprising polymer segments which are the reaction product of (i) an acrylonitrile/butadiene copolymer polyol or polyamine, with (ii) the molar excess of a reaction product of an aromatic or cycloaliphatic polyol with an aromatic or a cycloaliphatic polyisocyanate;
- and
- (c) at least one (meth)acrylate-terminated monomeric prepolymer component comprising the reaction product of (i) an organic polyisocyanate and (ii) a (meth)acrylate ester containing an active hydrogen.
A method of preparing an anaerobic adhesive composition comprising admixing
- (a) at least one (meth)acrylate monomer component;
- (b) at least one (meth)acrylate-terminated monomeric prepolymer component comprising polymer segments which are the reaction product of (i) an acrylonitrile/butadiene polyol or polyamine, with (ii) the molar excess of a reaction product of an aromatic or cycloaliphatic polyol with an aromatic or a cycloaliphatic polyisocyanate;
- and
- (c) at least one (meth)acrylate-terminated monomeric prepolymer component comprising the reaction product of (i) an organic polyisocyanate and (ii) a (meth)acrylate ester containing an active hydrogen.
A method of providing an adhesive bond having enhanced toughness and resistance to crack propagation comprising:
- (1) applying to a substrate an anaerobic adhesive composition comprising:
- (a) at least one (meth)acrylate monomer component;
- (b) at least one (meth)acrylate-terminated monomeric prepolymer component comprising polymer segments which are the reaction product of (i) an acrylonitrile/butadiene polyol or polyamine, with (ii) the molar excess of a reaction product of an aromatic or cycloaliphatic polyol with an aromatic or a cycloaliphatic polyisocyanate;
- (c) at least one (meth)acrylate-terminated monomeric prepolymer component comprising the reaction product of (i) an organic polyisocyanate and (ii) a (meth)acrylate ester containing an active hydrogen;
- and
- (d) at least one peroxide free radical initiator;
- (2) and allowing said composition to cure anaerobically.
Dependencies are inferred from the claim text.