Patent ID: 7393880

Claim:
A radically polymerizable composition comprising: a first component A comprising at least an oligomer having at least two radically polymerizable functions, which, when polymerized, form a homopolymer of which has a glass transition temperature (Tg) lower than 50° C., such a component being able to result through polymerization in a (co)polymer having a glass transition temperature (Tg) equal to or lower than 50° C., said oligomer accounting for more than 15%, of the total weight of the polymerizable monomers present in the composition; and a second component B comprising at least a (meth)acrylic monomer having at least one H link promoting group, such a (meth)acrylic monomer accounting for at least 15% of the total weight of the polymerizable monomers and oligomers present in the composition when such a monomer is a methacrylic monomer and at least 35% of the total weight of such polymerizable monomers and oligomers present in the composition when such a monomer is an acrylic monomer and represented by the formula: wherein R represents H or CH3; Z represents a single covalent link or a divalent spacer group; and Z′ is the H link promoting group selected from: —COOH, —CONHR′, —NHCONHR″, —NHCOOR″′, —NHCOSR iv and—NHR v wherein R, R″, R″′, R iv and R v represent, independently from each other, H or a C 1 -C 10 alkyl group or a C 6 -C 10 aryl group.