Methacrylate-based adhesive compositions

摘要

An adhesive composition, especially suitable for a two-part adhesive system curable via free radical polymerization comprises; (A) (meth)acrylate ester monomer; (B) chlorinated elastomeric polymer; (C) core-shell impact modifier; and (D) urethane (meth)acrylate oligomer. Example adhesive compositions include urethane (meth)acrylate oligomer (D) derived from (i) a di- or higher isocyanate having at least two isocyanate groups which differ in reactivity; (ii) a chain-extending reagent which has at least two groups selected from hydroxyl and/or amino groups, each capable of reaction with an isocyanate group of (i); (iii) a hydroxymethacrylate component or hydroxyacrylate component. Also urethane (meth)acrylate oligomers, suitable for use in adhesive compositions, and derived from: (i) a diisocyanate having two isocyanate groups which differ in reactivity; (ii) a chain-extending reagent which is a polyether polyol selected from ethoxylated and propoxylated derivatives of tri- and tetra-functional polyols; and (iii) a hydroxyl (meth)acrylate selected from polyethylene glycol (meth)acrylate and polypropylene glycol (meth)acrylate, are disclosed.

主权项

1. An adhesive composition, curable via free radical polymerisation, the composition comprising, based on the total weight of components (A), (B), (C) and (D):
(A) from 35% to 65% (meth)acrylate ester monomer(s), at least 70 wt % of which is methyl methacrylate; (B) from 3 to 32% chlorinated elastomeric polymer(s) selected from chlorinated polyethylenes and polychloroprenes; (C) from 10 to 35% core-shell impact modifier(s), provided that the combined amount of (B) and (C) is in the range of 30 to 45 wt %; and (D) from 1% to 20% urethane (meth)acrylate oligomer(s), wherein the urethane (meth)acrylate oligomer (D) is derived from: (i) a di- or higher isocyanate having at least two isocyanate groups; (ii) a branched chain-extending reagent which has at least three hydroxyl groups, each capable of reaction with an isocyanate group of (i), which is selected from a polyester polyol and a polyether polyol; and (iii) a hydroxymethacrylate component or hydroxyacrylate component.