Urethane acrylate hybrid structure adhesives

1. A polymerizable adhesive composition comprising an organoborane complex, a free polyol comprising at least one dimer fatty polyol, and a cardanol based polyester polyol or a poly-ε-caprolactone polyol; and a polyether polyol, at least one free radically polymerizable component, aaa isocyanate-terminated urethane pre-polymer, a free isocyanate, and a low molecular weight chain extending compound, wherein the composition bonds dissimilar material substrates and is free of plasticizers and toughening agents.

2. The polymerizable adhesive composition of claim 1 , wherein the dimer fatty polyol is derived from a dimer fatty acid with a diol, or from a dimer fatty diol with a diacid.

3. The polymerizable adhesive composition of claim 2 , wherein the diol is selected from the group consisting of ethylene glycol, propane dial, butane diol, hexanediol, and combinations thereof.

4. The polymerizable adhesive composition of claim 2 , wherein the diacid is, selected from the group consisting of adipic acid, glutaric acid, succinic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, heptane dicarboxylic acid, octane dicarboxylic acid, nonane dicarboxylic acid, decane dicarboxylic acid, undecane dicarboxylic acid, dodecane dicarboxylic acid, and combinations thereof.

5. The polymerizable adhesive composition of claim 1 , wherein the polyether polyol is selected from the group consisting of substituted or unsubstituted polyalkylene ether glycols, polyhydroxy polyalkylene ethers, ethylene or propylene oxide adducts of polyols, mono-substituted esters of glycerol, and combinations thereof.

6. The polymerizable adhesive composition of claim 1 , wherein the at least one free radically polymerizable component is a monomer selected from the group consisting of an alkyl and cycloalkyl acrylate, an alkyl methacrylate, a hydroxyl alkyl acrylate and methacrylate, and combinations thereof.

7. The polymerizable adhesive composition of claim 1 , wherein the low molecular weight chain extending compound is selected from the group consisting of ethylene glycol, diethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, 1,4-butylene glycol, 1,6-hexylene glycol, neopentyl glycol, 3-methyl pentane glycol, 1,4-cyclohexane-dimethanol, and combinations thereof.

8. The polymerizable adhesive composition of claim 1 , wherein the organoborane complex comprises a trialkyl borane with a nitrogen-containing compound.

9. The polymerizable adhesive composition of claim 8 , wherein the nitrogen-containing compound is a unsubstituted or substituted amine selected from the group consisting of a primary and tertiary amine.

10. The polymerizable adhesive composition of claim 9 , wherein the organoborane complex is selected from the group consisting of triethylborane dimethylaminopropyl amine complex, tributylborane dimethylaminopropyl amine complex, triethylborane pyrrolidine complex, tri-t-butylborane pyrrolidine complex, triethylborane pyridine complex, tri-t-butyl pyridine complex, triethylborane methoxypropyl amine complex, and tributylborane methoxypropyl amine complex.

11. The polymerizable adhesive composition of claim 1 , wherein the isocyanate-terminated urethane prepolymer is prepared from polymerization of an excess isocyanate with a polyol.

12. The polymerizable adhesive composition of claim 11 , wherein the excess isocyanate is selected from the group consisting of an aromatic diisocyanate, and an aliphatic and cycloaliphatic diisocyanate.

13. The polymerizable adhesive composition of claim 1 , further comprising a filler selected from the group consisting of talc, mica, kaolin, bentone clay, aluminum oxides, titanium oxides, iron oxides, barium sulfate, hornblends, amphibiles, chrysotile, carbon black, carbon fibers, fumed silica, molecular sieves and combinations thereof.

14. The polymerizable adhesive composition of claim 1 , further comprising a catalyst selected from the group consisting of triethylamine, benzyldimethylamine, triethylenediamine, tetramethylbutanediamine, diazobicycloundecene, stannous acetate, stannous octoate, stannous laurate, stannous oleate, dialkyl tin salts of carboxylic acids such as dibutyltin diacetate, dibutyltin dilaurate, dibutyltin maleate, dibutyltin di-2-ethylhexoate, dilauryltin diacetate, dioctyltin diacetate, trialkyltin hydroxide, dialkyltin oxide, dibutyltin disulfide, dibutyl tin diisooctylmaleate, dibutyltin dilauryl mercaptide, dibutyltin di(isooctylmercaptoacetate), zinc neodecanate, iron acetylacetonate, and combinations thereof.

15. A composition of matter comprising at least two substrates each having at least one surface and the polymerizable adhesive composition of claim 1 .

16. The composition of matter of claim 15 , wherein the substrates comprise unsaturated polyester resin, vinyl ester resin, epoxy resin, metal, polypropylene, thermoplastic olefins, nylon, acrylonitrile-butadiene styrene and combinations thereof.

17. A method for bonding at least two substrates comprising steps of:

(a) providing a first substrate with at least one surface,

(b) providing a second substrate with at least one surface,

(c) providing the polymerizable adhesive composition of claim 1 ,

(d) applying the polymerizable adhesive composition to the at lease one surface of the first substrate, second substrate or both the first and second substrates,

(f) aligning the first substrate and second substrate so that the surface of one of the substrates having the polymerizable adhesive composition is juxtaposed and in contact with the surface of the other substrate and curing the polymerizable adhesive composition.

18. The method of claim 17 , wherein the polymerizable adhesive composition is applied with a static or a dynamic mixer.

19. The method of claim 17 , wherein the surfaces are treated prior to application of the polymerizable adhesive composition.