Patent ID: 9580557
Date: 2017-02-28
CPC Classifications: C08G,C09D,Y10T

Claim:
1. A hard coating composition comprising an organo polysiloxane component consisting of an organo polysiloxane (a) having silicon-containing bond units represented by the following formulae T1 to T3 and an organo polysiloxane (b) having silicon-containing bond units represented by formulae T1 to T3, wherein the organo polysiloxane (a) contains silicon-containing bond units represented by 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 a number of such units, wherein a 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 organo polysiloxane (a), (B)/(A), is from 12 to 58.7, and which has a weight average molecular weight of from 800 to 8,000, and wherein the organo polysiloxane (b) is an organo polysiloxane having a weight average molecular weight between 1/10 and 1/1.5 of the weight average molecular weight of the organo polysiloxane (a): wherein R is a hydrogen atom or a C the ratio of the content of the organo polysiloxane (b) to the organo polysiloxane (a) is from 1.5 to 30 by mass ratio; wherein a proportion of the number of T units in said organo polysiloxane (a) is 95 to 100% based on the total number of units T, M, D and Q, wherein M is of formula R wherein the total number of units D in the organo polysiloxane (b) is 0.