08-08-2013 дата публикации
Номер: US20130200426A1
Принадлежит:
A silicon-based curable composition providing improved transparency, mechanical strength and resistance against heat and photo-degradation comprises at least one organopolysiloxane represented by the composition formula (1): 1. A curable composition comprising {'br': None, 'sup': 1', '1', '1', '2', '1', '2', '1', '2, 'sub': 3', '1/2', 'a', '2', '2/2', 'b', '2/2', 'c', '3/2', 'd', '3/2', 'e', '2', '1/2', 'f, '(RSiO)(RSiO)(RRSiO)(RSiO)(RSiO)(RRSiO)\u2003\u2003(1),'}, '(A) at least one organopolysiloxane represented by the composition formula (1){'sup': 1', '2', '1', '2, 'wherein each Rindependently represents a monovalent organic group having 1 to 20 carbon atoms or an OH group with the proviso that at each silicon-atom bearing no Rat least one Rrepresents a monovalent organic group having 1 to 20 carbon atoms, each Rindependently represents a methacryloxyalkyl group having 5 to 20 carbon atoms and a, b, c, d, e, f each represent the fraction of the number of the respective units based on the number of all units of the organopolysiloxane and satisfy a≧0, b≧0, c≧0, d≧0, e≧0, f≧0 and also satisfy c+e>0 and a+b+c+d+e+f=1; and'}(B) at least one curing catalyst.3. The curable composition according to claim 2 , wherein the composition further comprises at least one organopolysiloxane which is of branched structure represented by the composition formula (4):{'br': None, 'sup': 1′', '1′', '1′', '2', '1′', '2, 'sub': 3', '1/2', 'a', '2', '2/2', 'b', '2/2', 'c', '3/2', 'd', '3/2', 'e, '(RSiO)(RSiO)(RRSiO)(RSiO)(RSiO)\u2003\u2003(4),'}{'sup': 1′', '2, 'wherein each R independently represents an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms, each Rindependently represents a methacryloxyalkyl group having 5 to 20 carbon atoms and a, b, c, d, e each represent the fraction of the number of the respective units based on the number of all units of the organopolysiloxane and satisfy a>0, b≧0, c≧0, d≧0, e>0 and a+b+c+d+e=1.'}4. The curable ...
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