Loading patent…
AssigneeAsahi Glass Company, Limited
InventorsKyoko Yamamoto, Takashi Shibuya, Tatsuya Miyajima
Estimating the term…
An organo polysiloxane to improve the abrasion and weather resistance of a hard coating layer obtained from a silicone-type hard coating composition. The hard coating composition contains a first organo polysiloxane having silicone-containing bond units selected from the group consisting of R—Si(—OX)2(—O*—), R—Si(—OX)(—O*—)2 and R—Si(—O*—)3) and a second organo polysiloxane having the same, where the second organo polysiloxane has a weight average molecular weight of 1/10 to 1/1.5 times that of the first organo polysiloxane. Further, a resin substrate having a hard coating layer made of a cured product of the hard coating composition that has improved abrasion and weather resistance. For resin substrates used in a bent state, the hard coating layer also improves the cracking resistance associated with mechanical stress.
An organo polysiloxane which contains silicon-containing bond units represented by the following formulae T1 to T3 in a ratio of T1:T2:T3=0-5:15-40:55-85 and in a ratio of T3/T2=1.5-4.0, in number of such units, wherein the ratio of the number (B) of hydroxy groups bonded to silicon atoms to the number (A) of alkoxy groups bonded to silicon atoms in the molecule i.e. (B)/(A) is at least 12.0 on molecular average, and which has a weight average molecular weight of from 800 to 8,000:
Dependencies are inferred from the claim text.