Process for preparing chloro-polysiloxanes
Abstract
Abstract PROCESS OF PREPARING COMPOUNDS OF THE THE GENERAL FORMULA R-SI(-CL)A-O((3-A)/2) WHEREIN A=0.5 TO 991 AND R IS HYDROGEN, CHLORINE, ALKYL OR ARYL, BY SUBJECTING SILANES OF THE GENERAL FORMULA RSIC13 TO HYDROLYSIS WITH TERTIARY ALCOHOLS AS HYDROLYZING AGENTS. THE TERTIARY ALCOHOL IS ADDED IN DROPWISE MANNER TO THE SILANES AT TEMPERATURES BETWEEN ABOUT 10*C.-150* C., PREFERABLY IN THE PRESENCE OF AN INERT SOLVENT. LESS THAN 0.9 MOLE OF TERITARY ALCOHOL PER MOLE OF SILANE ARE USED. UNREACTED SILANE AS WELL AS T-ALKYLCHLORIDE, WHICH IS FORMED AS BY-PRODUCT, AND THE SOLVENT ARE REMOVED BY DISTILLATION. THE COMPOUNDS ARE HYDROPHOBING AGENTS FOR A VARIETY OF PURPOSES AND STARTING MATERIALS FOR HARDENERS OF SILICONE RUBBERS. THE PROCESS RESULTS IN THE FORMATION OF NOVEL COMPOUNDS OF THE FORMULA R-SI(-CL)A-O((3-A)/2), AND (R-SI-O(1.5))G, (R-SI(-CL)2-O(0.5))G, (R-SI(-CL)-O(1.0))B HAVING AN AVERAGE MOLE WEIGHT OF 600-2000 WHEREIN A= 0.5-0.9, G IS GREATER THAN H, G AND H ARE GREATER THAN ZERO, AND R IS HYDROGEN, CHLORINE, ALKYL OR ARYL.
Inventors
- 👤 Gotz Koerner
- 👤 Gerd Rossmy
Bibliographic Details
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