Two part hybrid adhesive
View Patent ↗Provided are two part hybrid adhesives that comprise an organoborane amine complex, a polyamine, a component polymerizable by free radical polymerization, and a polyisocyanate component. An isocyanate terminated prepolymer can advantageously be used in the practice of the invention. The adhesive is particularly well suited for low surface energy plastic bonding.
1. A polymerizable adhesive composition comprising an organoborane amine complex and a polyamine with a nitrogen to boron atomic ratio of less than 4, an isocyanate-terminated prepolymer made from an excess of isocyanate with polyol or polyamine, a free radically polymerizable component, and substantially no polyol, wherein the isocyanate-terminated prepolymer is present in an amount greater than 60 wt %.
2. A polymerizable adhesive composition comprising an organoborane amine complex, a polyamine component, a free radically polymerizable component, an isocyanate-terminated prepolymer made from an excess of isocyanate with polyol or polyamine, said composition comprising more than 50 wt % of urea, and substantially no polyol, wherein the isocyanate-terminated prepolymer is present in an amount greater than 60 wt %.
3. A polymerizable adhesive composition comprising an organoborane amine complex, a polyamine component, a free radically polymerizable component, and an isocyanate-terminated prepolymer made from an excess of isocyanate with polyol or polyamine, wherein the isocyanate-terminated prepolymer is present in an amount greater than 60 wt %.
4. The adhesive of claim 3 which is a two part adhesive comprising a part (A) and a part (B), wherein the ratio of part (A) to part (B) is from less than 4:1 to more than 1:4.
5. The adhesive of claim 4 , said composition comprising 60 to 100 wt % polyisocyanate in a second part (B).
6. A polymerizable adhesive composition comprising an organoborane amine complex and a polyamine with a nitrogen to boron atomic ratio of less than 4, a polyisocyanate component, a free radically polymerizable component, and substantially no polyol, wherein the polyisocyanate component is present in an amount greater than 60 wt %.
7. A polymerizable adhesive composition comprising an organoborane amine complex, a polyamine component, a free radically polymerizable component, and an isocyanate-terminated prepolymer made from an excess of isocyanate with polyol or polyamine, wherein the isocyanate-terminated prepolymer is present in an amount greater than 60 wt % and the adhesive is in a two part format, wherein the ratio of part (A) to part (B) is from less than 4:1 to more than 1:4.
8. A polymerizable adhesive composition comprising an organoborane amine complex, a polyamine component, a free radically polymerizable component, and a polyisocyanate, wherein the adhesive is a two part format, wherein the ratio of part (A) to part (B) is from less than 4:1 to more than 1:4 and part (B) comprises 60 to 100 wt % polyisocyanate.