Adhesive compositions for bonding passive substrates
AssigneeHenkel Corporation
InventorsJohn Woods, Susanne Morrill, Rick Danheiser
Life of this patent
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Abstract
Adhesive compositions are disclosed which cure rapidly and completely on confinement between passive substrates, such as magnesium alloys, that are deficient in transition metals and transition metal ions. The compositions include one or more acrylate resins, one or more peroxy free radical initiators, one or more onium salts, and an accelerator such as acetylphenyl hydrazine desirably in an amount of about 1.0% or less by weight of the composition. These compositions provide exceptional bonding to such substrates without the need for a transition metal primer. Methods of making and using such compositions are also disclosed.
Claims39
An adhesive composition capable of bonding passive substrates, comprising:
- (a) at least one monomer;
- (b) at least one peroxy free radical initiator;
- (c) at least one onium salt;
- and
- (d) at least one organic hydrazine present in an amount less than 1.0% by weight of said composition, wherein said monomer is selected from the group consisting of styrene, thiol-enes, acrylamides, maleate esters, fumarates, methylene maleates, and epoxides.
A one-part anaerobic adhesive composition having improved adhesion to passive substrates, comprising:
- (a) at least one acrylate monomer;
- (b) at least one peroxy free radical initiator;
- (c) at least one phosphonium salt represented by the structure:
- wherein R1, R2, R3 and R4, which may be the same or different are optionally substituted hydrocarbyl, hydrocarbylaryl, or aryl;
- and X is Cl, Br or F or a soft anion;
- and
- (d) acetylphenyl hydrazine in an amount from 0.25% to less than 1.0% by weight of said composition.
A method for providing enhanced adhesion to passive substrates, comprising the steps of:
- a) providing a composition comprising
- (i) at least one monomer selected from the group consisting of styrene, thiol-enes, acrylamides, maleate esters, fumarates, methylene maleates, and epoxides;
- (ii) at least one peroxy free radical initiator;
- (iii) at least one onium salt;
- and
- (iv) at least one organic hydrazine present in an amount less than 1.0% by weight of said composition;
- b) disposing said composition between two substrates;
- and
- c) effecting cure of said composition to effectuate enhanced adhesion thereof.
A method of making an anaerobic adhesive composition having improved adhesion to passive substrates, comprising the steps of:
- a) providing at least one monomer selected from the group consisting of styrene, thiol-enes, acrylamides, maleate esters, fumarates, methylene maleates, and epoxides, at least one peroxy free radical initiator, at least one onium salt;
- and at least one organic hydrazine present in an amount less than 1.0% by weight of said composition;
- and
- b) combining each of said components to form a mixture.
A one-part adhesive composition capable of bonding passive substrates, comprising:
- (a) at least one monomer;
- (b) at least one peroxy free radical initiator;
- (c) at least one onium salt;
- and
- (d) at least one organic hydrazine in an amount from 0.25% to less than 1.0 % by weight of said composition, wherein said onium salt is selected from the group consisting of phosphonium salts represented by the structure:
- wherein R1, R2, R3 and R4, which may be the same or different are optionally substituted hydrocarbyl, hydrocarbylaryl, or aryl;
- and X is Cl, Br or F or a soft anion, ammomum salts.
A method for providing enhanced adhesion to passive substrates, comprising the steps of:
- a) providing a one-part composition comprising
- (i) at least one monomer;
- (ii) at least one peroxy free radical initiator;
- (iii) at least one onium salt selected from the group consisting of phosphonium salts represented by the structure:
- wherein R1, R2, R3 and R4, which may be the same or different are optionally substituted hydrocarbyl, hydrocarbylaryl, or aryl;
- and X is Cl, Br or F or a soft anion;
- and
- (iv) at least one organic hydrazine in an amount from 0.25% to less than 1.0% by weight of said composition;
- b) disposing said composition between two substrates;
- and
- c) effecting cure of said composition to effectuate enhanced adhesion thereof.
A method of making a one-part anaerobic adhesive composition having improved adhesion to passive substrates, comprising the steps of:
- a) providing at least one monomer, at least one peroxy free radical initiator, at least one onium salt selected from the group consisting of phosphomum salts represented by the structure:
- wherein R1, R2, R3 and R4, which may be the same or different are optionally substituted hydrocarbyl, hydrocarbylaryl, or aryl;
- and X is Cl, Br or F or a soft anion;
- and at least one organic hydrazine in an amount from 0.25% to less than 1.0% by weight of said composition;
- and
- b) combining each of said components to form a mixture.
A one-part adhesive composition comprising:
- (a) at least one monomer;
- (b) at least one peroxy free radical initiator;
- (c) at least one onium salt;
- and
- (d) at least one organic hydrazine,
- wherein the composition cures faster in the presence of the onium salt as compared to the same composition without added onium salt.
Dependencies are inferred from the claim text.