Hard-coating, heat-absorbing composition and heat-shielding substance

A heat-shielding substance consisting essentially of a substrate and a transparent heat-absorbing, hard-coating layer which is formed on the substrate by applying and curing with heat a composition comprising:

• polysiloxane polysiloxane condensation product represented by the following formula
• (R.sub.a SiO).sub.n
• wherein R is a substituted or unsubstituted monovalent hydrocarbon group, .sub.a is a number from 1.90 to 2.05 and n has a value such that the polysiloxane is a hard-coating material,
• a derivative of thiourea represented by the following formula (1),
• R.sub.1 --NH--CS--NH--R.sub.2 ( 1)
• wherein R.sub.1 and R.sub.2 independently represent hydrogen, an alkyl group, aryl group, aralkyl group, alkenyl group, or a 5- or 6-membered cyclic residual group, having 1-22 carbon atoms, wherein each group may have one or more substitute groups selected from alkyl, aryl, aralkyl, and alkenyl groups having 1-10 carbon atoms, nitro group, halogen, hydroxyl group, and amino group, and, said derivative of thiourea and copper salt being present in an amount of from 5-50 parts by weight, based on 100 parts by weight of solid polysiloxane, and wherein the mole ratio of copper salt derivative of thiourea is from about 1:3 to 1:5.

A heat-shielding substance consisting essentially of a substrate, a metal layer formed by vacuum evaporation of a metal on the surface of said substrate, and a transparent heat-absorbing, hard-coating layer formed on the top of said metal layer by applying and curing with heat a composition comprising:

• polymerizable polysiloxane condensation product represented by the following formula
• (R.sub.a Sio).sub.n
• wherein R is a substituted or unsubstituted monovalent hydrocarbon group, .sub.a is a number from 1.90 to 2.05 and n has a value such that the polysiloxane is a hard-coating material,
• a derivative of thiourea represented by the following formula (1),
• R.sub.1 --NH--CS--NH--R.sub.2 ( 1)
• wherein R.sub.1 and R.sub.2 independently represent hydrogen, an alkyl group, aryl group, aralkyl group, alkenyl group, or 5- or 6-membered cyclic residual group, having 1-22 carbon atoms, wherein each group may have one or more substitute groups selected from alkyl, aryl, aralkyl, and alkenyl groups having 1-10 carbon atoms, nitro group, halogen, hydroxyl group, and amino group, and
• a copper salt of an organic acid, said derivative of thiourea and copper salt being present in an amount of from 5 to 50 parts by weight, based on 100 parts by weight of solid polysiloxane, and wherein the mole ratio of copper salt derivative of thiourea is from about 1:3 to 1:5.

A composition which upon curing provides a hard-coating heat-absorbing composition consisting essentially of:

• a solution in which a polymerizable polysiloxane condensation product represented by the following formula
• R.sub.a SiO).sub.n
• wherein R is a substitute or unsubstituted monovalent hydrocarbon group, .sub.a is a number from 1.90 to 2.05 and n has a value such that the polysiloxane is a hard-coating material, and a derivative of thiourea represented by the following formula (1),
• R.sub.1 --NH--CS--NH--R.sub.2 ( 1)
• wherein R.sub.1 and R.sub.2 independently represent hydrogen, an alkyl group, aryl group, aralkyl group, alkenyl group, or a 5- or 6-membered cyclic residual group, having 1-22 carbon atoms, wherein each group may have one or more substitute groups selected from alkyl, aryl, aralkyl, and alkenyl groups having 1-10 carbon atoms, nitro group, halogen, hydroxyl group, and amino group, are homogeneously dissolved, and
• a solution in which polysiloxane and a copper salt of an organic acid are homogeneously dissolved, said derivative of thiourea and copper salt being present in an amount of from 5 to 50 parts by weight, based on 100 parts by weight of solid polysiloxane, and wherein the mole ratio of copper salt derivative of thiourea is from about 1:3 to 1:5.