TERMOPLASTISKA AKRYLELASTOMERER

An improvement to two phase thermoplastic elastomer polymers comprising a final thermoplastic phase is disclosed. The polymers are useful in coatings, mastics, caulks, adhesives and articles, and comprises (a) a linear, or lightly crosslinked, polymeric phase, formed from at least one alpha , beta -ethylenically unsaturated monomer of which no more than two percent by weight is multi-ethylenically unsaturated monomer, and (b) a further polymeric phase in the form of discrete domains of from 2 to 50 nanometers in diameter dispersed within phase, (a), said further phase comprising polymer comprising units of at least one ethylenically unsaturated monomer which itself comprises at least 5, preferably at least 50 and more preferably 100 percent by weight of monomer having at least two sites of ethylenic unsaturation, the weight ratio of solids in said further phase to total solids in both phases being from 1:100 to 1:2; characterised in that (c) the composition also contains subsequent polymeric phase which is thermoplastic and has a glass transition temperature higher than that of phase (a) and at least a portion of which subsequent phase is intimately attached to at least one of phases (a) and (b). t