Patent ID: 6329482
Filing Date: 2001-12-11
Classification: C08F,G02B

Abstract:
Radically polymerizable composition comprising a mixture of:(a) one or more difunctional monomers of type (a) selected from the group consisting of monomers represented by:Formula (A): ##STR15##in which:R.sub.1, R'.sub.1, R and R', identical or different, independently are a hydrogen or a methyl group;m and n are, independently, integers between 0 and 4 inclusive;X and X', identical or different, are a halogen;p and q are, independently, integers between 0 and 4 inclusive; andFormula (A'): ##STR16##in which:R.sub.1 and R'.sub.1, identical or different, independently are a hydrogen or a methyl group;R is a linear or branched alkyl radical having from 2 to 8 carbon atoms, a cycloalkyl radical having from 3 to 6 carbon atoms, an ether radical of formula (R'--O--R"") in which R' and R"", identical or different, independently are a linear or branched alkyl radical having from 2 to 4 carbon atoms;(b) one or more difunctional monomers of type (b) selected from the group consisting of long chain alkenic difunctional oligomers represented by:Formula (B): ##STR17##in which:R.sub.1, R'.sub.1, R.sub.2 and R'.sub.2, identical or different, independently are hydrogen or a linear or branched alkyl radical;R.sub.3 and R.sub.4, different, are independently one hydrogen and the other an alkenyl radical having from 2 to 6 carbon atoms;R'.sub.3 and R'.sub.4, different, are independently one hydrogen and the other an alkenyl radical having from 2 to 6 carbon atoms;Z represents a carbamate function (--NH--CO--O--), a thiocarbamate function (--NH--CO--S--) or a urea function (--NH--CO--NH--);Z', independent from Z, represents a carbamate function (--O--CO--NH--), a thiocarbamate function (--S--CO--NH--) or a urea function (--NH--CO--NH--);R' represents a linear or branched alkyl radical having from 2 to 4 carbon atoms;R, identical or different when n.gtoreq.2, is a linear or branched alkyl radical having from 2 to 4 carbon atoms;Y, identical or different when n.gtoreq.2, is oxygen or sulfur;n is an integer defined in such a way that the total number of carbon atoms contained in the long chain situated between the two motifs Z and Z' is at least equal to 18;Formula (B'): ##STR18##in which:R.sub.1, R.sub.2, R.sub.3, R.sub.4, R'.sub.1, R'.sub.2, R'.sub.3, R'.sub.4, R and Y are such as defined above with reference to formula (B);n is an integer defined in such a way that the total number of carbon atoms contained in the long chain of the motif (R--Y).sub.n is at least equal to 22; andFormula (B""): ##STR19##in which:R.sub.1, R.sub.2, R.sub.3, R.sub.4, R'.sub.1, R'.sub.2, R'.sub.3, R'.sub.4, R, R' and Y are such as defined above with reference to formula (B);Z' is a carbamate function (--O--CO--NH--) or Z' is a thiocarbamate function (--S--CO--NH--);n is an integer defined in such a way that the total number of carbon atoms contained in the long chain of the motif (R--Y).sub.n --R' is at least equal to 22.