| 摘要 |
There are provided ultraviolet light absorbing agents of the following general formula <IMAGE> wherein: X is <IMAGE> Y is H or OH, Z is H, OH, OQ or OW, where at least one Z is OH if Y is H; Q is -CH2(CH2)nSi(R2)x(OR1)y; and W is -CmH2m+1; where x=0, 1 or 2, y=1, 2 or 3, x+y=3, R1=alkyl or alkanoyl having 1 to 6 carbon atoms, R2=alkyl having 1 to 6 carbon atoms, n=0, 1 or 2, and m=1 to 18. Also provided are organopolysiloxane protective coating compositions containing said ultraviolet light absorbing agents having unique utility for protecting transparent plastic articles.
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