Cyanoguaniddse as a vulcanization

Claim 1

A HEAT CURABLE COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF (1) HYDROXYLATED ORGANOSILICON POLYMERS SELECTED FROM THE GROUP CONSISTING OF (A) ORGANOPOLUSILOXANES POLYMERS SELECTED FROM GROUPS ARE SELECTED FROM THE GROUP CONSISTING OF MONOVALENT HYDROCARBON RADICALS AND HALOGENATED MONOVALENT HYDROCARBON RADICALS, AND (B) POLYMERS CONTAINING UNITS OF THE STRUCTURE -SI(-Y)2-X-SI(-Y)2-OWHEREIN X IS A DIVALENT RADICAL COMPOSED OF CARBON AND HYDROGEN ATOMS AND NO MORE THAN ONE OXYGEN ATOM, SAID OXYGEN ATOM BEING PRESENT IN A >C(-)-O-C(-)< GROUP AND Y IS A MONOVALENT HYDROCARBON RADICAL, SAID ORGANOSILICON POLYMERS HAVING A SILICON BONDED OH CONTENT OF AT LEAST 2 OH PER MOLECULE AND HAVING AN AVERAGE OF FRM 1.95 TO 2.05 MONOVALENT ORGANIC GROUPS ATTACHED TO SILICON PER SILICON ATOM AND HAVING AN AVERAGE OF AT LEAST 400 SILICON ATOMS PER MOLECULE, (2) AT LEAST 10 PERCENT BY WEIGHT BASED ON THE WEIGHT OF (1) OF A MODIFIED SILICA FILLER COMPRISING FINELY DIVIDED HYDROPHOBIC SOLID PARTICLES HAVING A SURFACE AREA OF AT LEAST 100 M.2/G., EACH OF SAID PARTICLES CONSISTING ESSENTIALLY OF A POLYMERIC SILICEOUS SBSTRATE CONSISTING ESSENTIALLY OF (A) FROM 50 TO 100 INCLUSIVE NOL PERCENT OF UNITS OF THE FORMULA SIO2, AND (B) FROM 0 TO 50 INCLUSIVE MOL PERCENT OF UNITS OF THE FORMULA RSIO1.5, WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF ALKYL RADICALS OF LESS THAN 6 CARBON ATOMS AND PHENYL, THERE BEING (C) ORGANOSILYL UNITS SELECTED FROM THE GROUP CONSISTNG OF R''R"SI= AND R''R"SI-, WHEREIN R'' IS SELECTED FROM THE GROUP CONSISTING OF ALKYL RADICALS OF LESS THAN 6 CARBON ATOMS AND PHENYL, AND R" IS SELECTED FROM THE GROUP CONSISTING OF ALKYL RADICALS OF LESS THAN 6 CARBON ATOMS, 3,3,3TRIFFLUOROPROPYL AND PHENYL RADICALS, IN AN AMOUNT SUCH THAT THE MOLAR RATIO OF (C) UNITS TO TOTAL (A) AND (B) UNITS IS NOT IN EXCESS OF 0.6, SAID ORGANOSILYL UNITS BEING ATTACHED TO SILICON ATOMS IN THE SURFACE OF SAID SUBSTRATE THROUGH SISOI LINKAGES, AND (3) AT LAST 0.1 PERCENT BY WEIGHT BASED ON THE WEIGHT OF (1) OF CYANOGUANIDINE.