Acrylic Resin Composition
A composition contains an acrylic resin and an impact modifier containing at least one dimer fatty acid and/or dimer fatty diol. The composition is suitable for use to form a sheet or as an adhesive, particularly as a pressure sensitive adhesive, anaerobic adhesive and a reactive hot-melt adhesive.
1 . A composition comprising an acrylic resin and an impact modifier comprising at least one dimer fatty acid and/or dimer fatty diol.
2 . A composition according to claim 1 wherein the acrylic resin comprises at least one acrylic monomer.
3 . A composition according to claim 2 wherein the acrylic monomer comprises acrylic acid and/or methacrylic acid, and/or esters thereof.
4 . A composition according to claim 1 wherein the impact modifier has a molecular weight in the range from 700 to 5,000.
5 . A composition according to claim 1 wherein the impact modifier comprises a polyester.
6 . A composition according to claim 5 wherein the polyester has a molecular weight in the range from 1,600 to 2,400.
7 . A composition according to claim 1 wherein the impact modifier comprises in the range from 10 to 70% by weight of residues of dimer fatty acid and/or dimer fatty diol.
8 . A composition according to claim 1 wherein the impact modifier is acrylate ended.
9 . A composition according to claim 1 wherein the impact modifier phase separates from the acrylic resin matrix on curing.
10 . An adhesive comprising an acrylic resin and an impact modifier comprising at least one dimer fatty acid and/or dimer fatty diol.
11 . The use of a composition comprising an acrylic resin and an impact modifier comprising at least one dimer fatty acid and/or dimer fatty diol as an adhesive.
12 . A sheet comprising an acrylic resin and an impact modifier comprising at least one dimer fatty acid and/or dimer fatty diol.
13 . A sheet according to claim 12 wherein the acrylic resin is polymethyl methacrylate.