Equilibrated organo-polysiloxane mixtures with terminal sulfuric acid groups and process for their preparation

Abstract

Abstract A LINEAR EQUILIBRATED ORGAN-POLYSILOXANE MIXTURE HAVING TERMINAL SULFURIC ACID GROUPS OF THE GENERAL FORMULA HO3S-O-(SI(-R)2-O)N-SO3H WHEREIN N=2 TO 20 AND R IS HYDROCARBON WHICH MAY BE SUBSTITUTED BY A GROUP INERT IN RESPECT TO SULFURIC ACID. A PORTION OF THE HYDROCARBON GROUPS R MAY BE REPLACED BY THE GROUP -O-(SI(-R)2-O)N-SO3H THE APPLICATION ALSO DISCLOSES A PROCESS FOR THE PREPARATION OF SUCH EQUILIBRATED ORGANO-POLYSILOXANE MIXTURES WHICH ARE IN EQUILIBRIUM WITH SULFURIC ACID AND CYCLIC COMPOUNDS OF THE GENERAL FORMULA ((SI(-R)2-O)N-SO3)M WHEREIN R AND N HAVE THE ABOVE MEANING, M BEING 1-10. IF A PORTION OF THE R GROUPS OF FORMULA I IS REPLACED BY GROUPS OF FORMULA V, THEN TWO OF THE FORMULA V GROUPS MAY FORM THE GROUP -O-(SI(-R)2-O)N-SO3-(SI(-R)2-O)N- ON THAT SIDE OF THE EQUILIBRIUM WHICH CONTAINS THE FORMULA II COMPOUNDS AND THE FREE SULFURIC ACID. THE NOVEL MIXTURES ARE USEFUL AS EQUILIBRATION CATALYSTS FOR ORGANOPOLYSILOXANES. THEY MAY ALSO SUCCESSFULLY BE EMPLOYED AS IMPREGNATION AGENTS FOR IMPARTING VARIOUS MATERIALS SUCH AS GLASS, TEXTILES, AND THE LIKE WITH WATER REPELLENT CHARACTERISTICS.

Inventors

• 👤 Gerd Rossmy

Bibliographic Details