Patent ID: 6767934
Filing Date: 2004-07-27
Classification: C08F,C08G,G02B,Y10S

Abstract:
Macromolecular photocrosslinker having the general formula (A)n(B)m(C)p wherein(i) units A, B and C are siloxane monomer units of the general formula â€”RaRbSiOâ€” wherein Ra and Rb in units A and B are lower substituted or unsubstituted alkyl groups, aryl groups or arylalkyl groups; (ii) C carries a photoactive acyl or aroyl phosphine oxide group; and (iii) n=0-98 mole %, m=0-98 mole %, n+m=50-98 mole % and p=0.5-50 mole %; wherein said photoactive groups, when exposed to light of wavelength above 305 nm, are adapted to generate radicals which are retained on the macromolecular photocrosslinker and react to form a crosslinked network structure.