초록 ▼

A method for bonding two substrates that includes applying an autodepositable adhesive to one of the substrates and then bonding the substrates together. This method is especially useful for bonding elastomers to metals. According to a first embodiment, the autodepositable adhesive is a one coat adh

A method for bonding two substrates that includes applying an autodepositable adhesive to one of the substrates and then bonding the substrates together. This method is especially useful for bonding elastomers to metals. According to a first embodiment, the autodepositable adhesive is a one coat adhesive having a low pH (approximately 1-3) and including (A) a flexibilizer or film-former, (B) optionally, an aqueous dispersion of a phenolic resin that includes water and a reaction product of a phenolic resin precursor, a modifying agent and, optionally, a multi-hydroxy phenolic compound wherein the modifying agent includes at least one functional moiety that enables the modifying agent to react with the phenolic resin precursor and at least one ionic moiety, and (C) an acid. According to a second embodiment, the autodepositable adhesive is a covercoat adhesive that includes a flexibilizer or film-former that is a latex that coagulates when exposed to metallic ions generated from the metallic substrate upon which the covercoat is applied. The covercoat preferably also includes a crosslinker as described above in connection with the one coat embodiment.

대표청구항 ▼

We claim: 1. An aqueous adhesive, comprising: a mixture of at least one flexibilizer ingredient that destabilizes in the presence of multivalent metal ions, and a crosslinker characterized by a nitroso or nitroso precursor compound containing at least two nitroso or nitroso precursor groups, wherei

We claim: 1. An aqueous adhesive, comprising: a mixture of at least one flexibilizer ingredient that destabilizes in the presence of multivalent metal ions, and a crosslinker characterized by a nitroso or nitroso precursor compound containing at least two nitroso or nitroso precursor groups, wherein the adhesive autodeposits on a metal substrate, and wherein the adhesive further comprises an acid providing a pH of 1 to 3 in the adhesive. 2. The adhesive according to claim 1, wherein the flexibilizer comprises a lattice, emulsion or dispersion of a halogenated polyolefin, an acrylonitrile-butadiene rubber or a styrene-acrylic polymer, styrene-butadiene rubber, neoprene, acrylic polymer, urethane polymer, ethylene-propylene copolymer, ethylene-propylene-diene terpolymer, polyamide, or poly(vinyl acetate). 3. The adhesive according to claim 1, wherein the adhesive is a one coat adhesive and further comprises at least one of hydrofluoric acid, phosphoric acid, sulfuric acid, hydrochloric acid or nitric acid. 4. The adhesive according to claim 3, wherein the acid comprises phosphoric acid. 5. The adhesive according to claim 1, further comprising an aqueous phenolic resin dispersion ingredient. 6. The adhesive according to claim 1, wherein the adhesive is a covercoat adhesive. 7. The adhesive according to claim 3, wherein the adhesive further comprises at least one compound agent that is a nitro compound, a nitroso compound, an oxime compound or a nitrate compound. 8. The adhesive according to claim 3, wherein the flexibilizer is (poly)butadiene, neoprene, styrene-butadiene rubber, acrylonitrile-butadiene rubber, halogenated polyolefin, acrylic polymer, urethane polymer, ethylene-propylene copolymer rubber, ethylene-propylene-diene terpolymer rubber, styrene-acrylic copolymer, polyamide or poly(vinyl acetate). 9. The adhesive according to claim 6, wherein the flexibilizer is a halogenated polyolefin, an acrylonitrile-butadiene rubber or a styrene-acrylic polymer. 10. The adhesive according to claim 6, further comprising an aqueous phenolic resin dispersion ingredient. 11. The adhesive according to claim 4, further comprising an aqueous phenolic resin dispersion ingredient. 12. The adhesive according to claim 7, further comprising an aqueous phenolic resin dispersion ingredient. 13. The adhesive according to claim 1, wherein said crosslinker is quinine dioxime, dibenzoquinone dioxime, 1,2,4,5-tetrachlorobenzoquinone, 2-methyl-1,4-benzoquinone dioxime, 1,4-naphthoquinone dioxime, 1,2-naphthoquinone dioxime or 2,6-naphthoquinone dioxime. 14. The adhesive according to claim 1, wherein the flexibilizer is a butadiene polymer comprising repeating monomer units of 2,3-dichloro-1,3-butadiene; 1,3-butadiene; 2,3-dibromo-1,3-butadiene isoprene; isoprene; 2,3-dimethylbutadiene; chloroprene; bromoprene; 2,3-dibromo-1,3-butadiene; 1,1,2-trichlorobutadiene; cyanoprene; or hexachlorobutadiene, or combinations thereof. 15. The adhesive according to claim 14, wherein said butadiene polymer further comprises repeating units of a comonomer of α,β-unsaturated carboxylic acid; alkyl-2-haloacrylates; vinylidene chloride; vinyl toluene; vinylnaphthalene; vinyl ether, vinyl ester, vinyl ketone; ester of acrylic or methacrylic acid, amide of acrylic or methacrylic acid or nitrile of acrylic or methacrylic acid, or combinations thereof. 16. The adhesive according to claim 1, wherein said flexibilizer is polydichlorobutadiene, said crosslinker is dinitrosobenzene, and further comprising silica and polymaleimide. 17. The adhesive according to claim 1, wherein said crosslinker has the structure: description="In-line Formulae" end="lead"(R) m--Ar--(NO)2description="In-line Formulae" end="tail" wherein Ar phenylene or naphthalene; R is a monovalent organic radial of an alkyl, cycloalkyl, aryl, aralkyl, alkaryl, arylamine or alkoxy radicals having from 1 to 20 carbon atoms, amino, or halogen, and m is 0, 1, 2, 3, or 4. 18. The adhesive according to claim 17, wherein said crosslinker is m-dinitrosobenzene, p-dinitrosobenzene, m-dinitrosonaphthalene, p-dinitrosonaphthalene, 2,5-dinitroso-p-cymene, 2-methyl-1,4-dinitrosobenzene, 2-methyl-5-chloro-1,4-dinitrosobenzene, 2-fluoro-1,4-dinitrosobenzene, 2-methoxy-1-3-dinitrosobenzene, 5-chloro-1,3-dinitroso-benzene, 2-benzyl-1,4-dinitrosobenzene, 2-cyclohexyl-1,4-dinitrosobenzene or combinations thereof. 19. The adhesive according to claim 5, wherein said phenolic resin dispersion is a chain extended resole dispersion. 20. The adhesive according to claim 5, wherein said phenolic resin is a novolak. 21. The adhesive according to claim 19, wherein said resole is modified by a modifying agent that contains a sulfur-containing ionic group. 22. The adhesive according to claim 8, wherein said control agent is present at from 2 to 5 weight % based on the total amount of non-volatile ingredients in the adhesive, and is nitroguanidine, an aromatic nitrosulfonate, a salt of the aromatic nitrosulfonate, or trinitrophenol. 23. An aqueous adhesive, comprising: a mixture of at least one flexibilizer ingredient that destabilizes in the presence of multivalent metal ions, a crosslinker characterized by a nitroso or nitroso precursor compound containing at least two nitroso or nitroso precursor groups, wherein the adhesive autodeposits on a metal substrate, and wherein the adhesive further includes an acid which comprises at least one of hydrofluoric acid, phosphoric acid, sulfuric acid, hydrochloric acid, or nitric acid. 24. The adhesive according to claim 23, wherein the flexibilizer comprises a lattice, emulsion or dispersion of a halogenated polyolefin, poly(butadiene), an acrylonitrile-butadiene rubber or a styrene-acrylic polymer, styrene-butadiene rubber, neoprene, acrylic polymer, urethane polymer, ethylene-propylene copolymer, ethylene-propylene-diene terpolymer, polyamide, or poly(vinyl acetate), wherein the adhesive further includes an aqueous phenolic resin dispersion ingredient, and wherein the crosslinker is quinine dioxime, dibenzoquinone dioxime, 1,2,4,5-tetrachlorobenzoquinone, 2-methyl-1,4-benzoquinone dioxime, 1,4-naphtho-quinone dioxime, 1,2-naphthoquinone dioxime, 2,6-naphthoquinone dioxime, m-dinitrosobenzene, p-dinitrosobenzene, m-dinitrosonaphthalene, p-dinitroso-naphthalene, 2,5-dinitroso-p-cymene, 2-methyl-1,4-dinitrosobenzene, 2-methyl-5-chloro-1,4-dinitrosobenzene, 2-fluoro-1,4-dinitrosobenzene, 2-methoxy-1-3-dinitroso-benzene, 5-chloro-1,3-dinitrosobenzene, 2-benzyl-1,4-dinitrosobenzene, 2-cyclo-hexyl-1,4-dinitrosobenzene or combinations thereof. 25. The adhesive according to claim 24, wherein said phenolic resin is a chain extended resole dispersion or a novalak, wherein the flexibilizer is a butadiene polymer or copolymer comprising repeating monomer units of 2,3-dichloro-1,3-butadiene; 1,3-butadiene; 2,3-dibromo-1, 3-butadiene isoprene; isoprene; 2,3-dimethylbutadiene; chloroprene; bromoprene; 2,3-dibromo1,3-butadiene; 1,1,2-trichiorobutadiene; cyanoprene; or hexachlorobutadiene, or combinations thereof.