MONOMERIC UNITS USEFUL FOR REDUCING THE MODULUS OF LOW WATER POLYMERIC SILICONE COMPOSITIONS

摘要

Monomeric units useful in reducing the modulus of low water polymeric silico ne compositions are disclosed. Low water compositions including the subject monomeric units are especially useful in the formation of biomedical article s such as low water silicone contact lenses. In formula (I), A is an activated unsaturated group; R and D independently are alkyl, alkylene or haloalkyl groups having 1 to 10 carbon atoms wherein said carbon atoms may include eth er linkages therebetween; M is hydrogen, fluorine, or an alkyl group; R1, R2, R 3 and R4 are independently selected from: alkyl or haloalkyl groups wherein ether linkages may be included between carbon atoms; siloxane groups; and carbocyclic ring groups having from 6 to 18 carbon atoms; m is an integer fr om 1 to 500; n is an integer from 1 to 20; x and y are 0 or 1; z is 1 or 2; and x + y + z = 3; so long as at least one of R1 or R2 is an alkyl group having fr om 1 to 10 carbon atoms.