Patent ID: 7838599

Claim:
Polyacrylate having an at least bimodal molecular weight distribution, characterized by at least two maxima in the molar mass distribution curve, at points M 1 and M 2 , with M 1 >M 2 , in which there are at least two polymers, P 1 and P 2 , each having their own molecular weight distribution, the polymer P 1 having a weight-average molecular weight in the range of from about 800,000 g/mol to 2,000,000 g/mol, and a polydispersity of between 4 to 15 and possessing a most frequent molar mass M max (P 1 ) and the polymer P 2 having a weight-average molecular weight in the range of from about 50,000 g/mol to 250,000 g/mol, and a polydispersity of between 1.3 to 10 and possessing a most frequent molar mass M max (P 2 ), where M max (P 1 )>M max (P 2 ), at least the polymer P 1 being based on a monomer mixture comprising (a) at least one monomer type selected from the group of the acrylic esters and of the methacrylic esters of the general formula H 2 C═CR 1 —COOR 2 where R 1 ═H or CH 3 and where R 2 represents an aliphatic hydrocarbon chain having 4 to 15 carbon atoms; (b) at least one olefinically unsaturated monomer type containing functional group able to react for a thermal crosslinking reaction, said functional groups selected from the group consisting of hydroxyl, epoxy, amide and isocyanate, and at least the polymer P 1 has copolymerized monomers of the olefinically unsaturated monomer type containing groups that are reactive for a thermal crosslinking reaction, and is capable under the influence of thermal energy of entering into a crosslinking reaction.