Epoxy-acrylic hybrid adhesive
View Patent ↗The invention relates to a two-component adhesive based on hybrid urethane-acrylate epoxies comprising a core/shell rubber demonstrating good T-peel strength. The adhesives are suitable for use in industry, e.g., as adhesives for transportation industry applications.
1. A two-component adhesive composition comprising an A-side and a B-side:
A) the A-side comprising:
i) a) an acrylate-capped polyurethane having a Tg equal to or greater than 20° C.,
i) b) an acrylate-capped polyurethane having a Tg equal to or less than −20° C.,
ii) a core/shell graft copolymer,
iii) a phosphorous compound with mono-esters of phosphonic or mono- and diesters of phosphonic and phosphoric acids having one unit of vinyl or allylic unsaturation present,
iv) an olefinically-unsaturated carboxylic acid,
v) an olefinically-unsaturated carboxylic acid ester, and
vi) a reducing agent and
B) the B-side comprising:
i) an epoxy resin
ii) a oxidizing agent,
iii) a stabilizer, and
iv) a filler.
2. The adhesive composition of claim 1 further comprising vii) a rheology modifier in the A-side, in the B-side, or in both the A-side and B-side.
3. The adhesive composition of claim 1 wherein the acrylate-capped polyurethane A) i) is obtained by reacting a polyol with a multifunctional isocyanate to complete reaction of the isocyanate to obtain a pre-polymer, and capping the pre-polymer with acrylate groups.
4. The adhesive composition of claim 1 wherein the epoxy resin B) i) comprises a liquid epoxy resin.