Process for producing diorganopolysiloxane polymers

Abstract

Abstract A PROCESS FOR PRODUCING DIORGANOPOLYSILOXANE POLYMERS HAVING A VISCOSITY OF 1000 TO 200,000,000 CENTIPOISES AT 25*C. AND AN AROMATIC CONTENT OF 1 TO 50 MOLE PERCENT COMPRISING MIXING A FIRST CYCLIC POLYSILOXANE WITH A SECOND CYCLIC POLYSILOXANE IN THE PRESENCE OF 1 TO 90 PARTS BASED ON 100 PARTS OF SAID FIRST CYCLIC POLYSILOXANE OF A LINEAR DIORGANOPOLYSILOXANE ADDITIVE HAVING A VISCOSITY OF 10,000 TO 200,000,000 CENTIPOISES AT 25*C., WHERE THE ORGANO GROUPS IN THE LINAR DIORGANOPOLYSILOXANE ARE SELECTED FROM THE CLASS CONSISTING OF ALKYL, CYCLOALKYL, MONONUCLEAR ARYL, MONONUCLEAR ALARYL, MONONUCLEAR ARALKYL, ALKENYL, BINUCLEAR ARYL AND MIXTURES THEEROF WHEREIN LESS THAN 50 MOLE PERCENT OF THE ORGANO RADICALS MAY BE AROMATIC AND NO MORE THAN 50 MOLE PERCENT OF THE ORGANO RADICALS MAY BE SELECTED FROM ALKENYL; HEATING THE MIXTURE TO TEMPERATURES IN THE RANGE OF 110-175*C. TO DRIVE OFF MOISTURE; ADDING UP TO 50 PARTS PER MILLION OF AN ALKALI METAL HYDROXIDE TO THE MIXTURE; AND EQUILBRATING THE RESULTING MIXTURE AT A TEMPERATURE IN THE RANGE OF 140 TO 200*C. UNTIL THE DESIRED REACTION PRODUCT IS OBTAINED.

Inventors

• 👤 J Razzano

Bibliographic Details