Zinc-siloxane polymer and coating and method for making the same

Abstract

Abstract A ZINCPHENYLSLOXANE POLYMER MADE BY REACTING A ZINC SALT SUCH AS ANHYDROUS ZINC ACETATE WITH A DIFUNCTIONAL DIPHENYLSILOXANE MONOMER SUCH AS DIPHENYLIDALKOXYSLANE OR WITH A TRIFUNCTIONAL OR POLYFUNCTIONAL SILANE POLYMER, SUCH AS THE ANHYDROUS HYDROLYSIS AND ALCOHOLYSIS PRODUCT OF PHENYLTRICHLOROSILANE USING HEAT SUFFICIENT TO INSURE THE REACTION OCCURS (ABOUT 200*C.) WHICH CAN BE NOTED BY THE DISTILLATION OF ALKYL ACETATE, A BY-PRODUCT OF THE REACTION. THE FUNCTIONALITY OF THE SILANE MONOMER IN THE AOVE DIFUNCTIONAL POLYMER IS 2, IN THAT IT REACTS THROUGH ITS TWO ALCOHOLATE GROUPS TO FORM THE ORDERED-SEQUENCE COPOLYMER POLYZINCPHENYLSILOXANE HAVINT THE REPEATED BONDING: (-SI(-R1)2-C-ZN-O-)N WHERE R1 IS A PHENYL GROUP AND N IS GREATER THAN 2. THE ZINCPHENYLSILOXANE COPOLYMERS PREPARED FROM DIMERS, TIMERS, TETRAMERS, PENTAMERS, AND HEXAMERS OF THE A: HYDROUS HYDROLYSIS AND ALCOHOLYSIS PRODUCT OF PHENYLTRICHLOROSILANE ALSO HAVE ALL THE ZINC IONS IN BETWEEN (O-SI-O) GROUPS BUT NEED NOT BE STRICTLY IN ORDERED SEQUENCE IF THERE ARE ADDITIONAL INTERSPERSED (O-SI-O) GROUPS. THESE POLYMERIC REACTANTS ALL HAVE A FUNCTIONALITY GREATER THAN 2 WHEN REACTING WITH ANHYDROUS ZINC ACETATE. THE ZINCPHENYLSILOXANE POLYMER MAY THEREAFTER BE BLENDED WITH A NON-MIGRATING PLASTICIZER AND COREACTANT SILICONE MONOMER AND CURED.

Inventors

• 👤 B Marks
• 👤 P Chiesa

Bibliographic Details