Opaque non-pigmented microporous film and process and composition for preparing the same
Abstract
Abstract THIS INVENTION RELATES TO FILMS WHICH ARE OPAQUE AND MICROPOROUS, BUT WHICH DO NOT CONTAIN PIGMENTS TO ENHANCE THEIR WHITENESS. THE CONTINUOUS, OPAQUE FILMS ARE PREPARED BY MIXING A HOMOGENEOUS SOLUTION OF THERMOSETTING POLYMERIC MATERIAL WITH A SOLVENT MIXTURE FOR SAID POLYMERIC MATERIAL COMPRISING AT LEAST TWO MISCIBLE LIQUIDS, AT LEAST ONE OF SAID LIQUIDS BEING A NON-SOLVENT FOR SAID POLYMERIC MATERIAL AND HAVING A LOWER VOLATILITY THAN THAT OF THE OTHER LIQUIDS IN SAID MIXTURE. UPON CURING OF THE RESIN MATERIAL, THE NON-SOLVENT WHICH IS PRECIPITATED IN THE RESIN MATRIX IS EVAPORATED TO FORM A FILM CONTAINING DISCRETE CLOSED CELLS. THE FILMS ARE USEFUL IN PRODUCING HEAT AND MAR RESISTANT PAINTS AND COATINGS WITHOUT THE ADDITON OF COSTLY PIGMENTS.
Inventors
- 👤 Jerome A Seiner
Bibliographic Details
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