Pigmented polysiloxane surface coating compositions for glossy coatings of increased thermal stability

Claim 1

SURFACE COATING COMPOSITIONS COMPRISING A RESINOUS ORGANO POLYSILOXANE AS BINDER AND A TITANIUM DIOXIDE PIGMENT WHEREIN SAID ORGANO POLYSILOXANE HAS THE FORMULA RNSIO4-N/2 IN WHICH N HAS A VALUE IN THE RANGE BETWEEN 1 AND 2 AND EACH SUBSTITUENT R IS SELECTED FROM THE GROUP CONSISTING OF METHYL, PHENYL, HYDROXYL, ALKOXYL, CO-CONDENSED RADICALS OF A POLYEPOXIDE AND CO-CONDENSED RADICALS OF A POLYESTER INCLUDING POLYCARBONATE, SAID ORGANO POLYSILOXANE BEING COMPOSED OF DIFUNCTIONAL SILOXANE UNITS AND TRIFUNCTIONAL SILOXANE UNITS IN A RATIO OF FROM 40:60 TO 64:36, THE SUM OF SIO2, SI BONDED METHYL AND SI BONDED PHENYL AMOUNTING TO AT LEAST 50 PERCENT BY WEIGHT OF SAID ORGANO POLYSILOXANE, THE RATIO OF PHENYL TO METHYL THEREIN BEING FROM 40:60 TO 57:43 AND THE RATIO OF ORGANIC RADICALS TO SILICON ATOMS AMOUNTING TO LESS THAN 1.90:1, WHICH SURFACE COATING COMPOSITION CONTAINS FOR EVERY 100 GRAMS OF THE SAID BINDER AT LEAST 250 GRAMS OF TITANIUM DIOXIDE PIGMENT OF RUTILE STRUCTURE AND AT MOST A TOTAL OF 350 GRAMS OF HEAT STABLE PIGMENT.