Heat-resisting layer-constructions and method for preparing the same

Heat resisting layer-constructions consisting of

• (a) a heat resistant, base substrate and
• (b) a resinous layer coated and heat cured on said substrate,
• said resinous layer (b) comprising a polyaralkylsiloxane comprising structural units having the general formula (I) ##STR2## wherein R is a lower alkyl radical;
• Ar is an aryl radical;
• X is a polycondensable functional radical;
• x, y and z, each represents the molar proportion of the unit for which it is the subscript, respectively, and wherein the free bonds in each of the structural units shown in the general formula (I) are selected from the radicals as defined for R, Ar and X, or may combine with one another to form a bridging bond or may be a mono-functional radical, so long as the numerical molar fraction:
• ##EQU1## in said polyaralkylsiloxane having the general formula (I) is from 0.65 to 1.00,
• the functionality of the polycondensable functional groups in said polyaralkylsiloxane having the general formula (I) is from 2 to 3, and
• the ratio of the number of carbon atoms to the number of silicon atoms in said polyaralkylsiloxane having the general formula (I) is from 4.25 to 16.