Process for the preparation of synthetic paper

Abstract

Abstract 1. A PROCESS FOR THE PREPARATION OF SYNTHETIC PAPER HAVING A FINELY POROUS SURFACE FROM ABOUT 0.5 TO ABOUT 20 MICRONS THICK, WHICH COMPRISES: (A) HOMOGENEOUSLY MELTING AND MILLING A COMPOSITION CONSISTING ESSENTIALLY OF (1) 100 PARTS BY WEIGHT OF A STYRENE SYNTHETIC RESIN COMPONENT SELECTED FROM AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF STYRENE HOMOPOLYMERS, HIGH IMPACT POLYSTYRENES, ACRYLONITRILE-STYRENE COPOLYMERS, ACRYLONITRILE-BUTADIENE-STYRENE COPOLYMERS, METHYL METHACRYLATESTYRENE COPOLYMERS, A-METHYL-STYRENE HOMOPOLYMERS AND A-METHYL STYRENE COPOLYMERS, (2) 5 TO 50 PARTS BY WEIGHT OF AN ETHYLENE SYNTHETIC RESIN COMPONENT SELECTED FROM AT LEAST ONE MEMBER SOF THE GROUP CONSISTING OF HIGH, MEDIUM OR LOW DENSITY POLYETHYLENES, LOW POLYMERIZED POLYETHYLENES, CHLORINATED POLYETHYLENES, ETHYLENE-PROPYLENE COPOLYMERS, ETHYLENEVINYL ACETATE COPOLYMERS, ETHYLENE-VINYL CHLORIDE COPOLYMERS, ETHYLENE-ETHYL ACRYLATE COPOLYMERS, AND ETHYLENE-ACRYLIC ACID IONOMERS, AND (3) 1 TO 200 PARTS BY WEIGHT OF AN INORGANIC FILLER; (B) SHAPING THE MILLED COMPOSITION INTO A FILM; (C) CONTACTING FOR A PERIOD OF FROM ABOUT 0.1 TO ABOUT 1.5 SECONDS AT LEAST ONE SURFACE OF THE FILM WITH A FIRST LIQUID SYSTEM AT A TEMPERATURE OF FROM 5 TO 35*C., SAID FIRST LIQUID SYSTEM BEING CAPABLE OF DISSOLVING THE STYRENE SYNTHETIC RESIN COMPONENT AND COMPRISING (1) AT LEAST 10% BY VOLUME OF AT LEAST ONE LIQUID SELECTED FROM THE GROUP CONSISTING OF DIALKYLAMIDES, AND DIALKYLSULFOXIDES, AND (2) UP TO 90% BY VOLUME OF WATER-MISCIBLE CONVENTIONAL ORGANIC SOLVENTS OR CARRIERS; AND (D) THEREAFTER CONTACTING THE SAME SURFACE WITH A SECOND LIQUID SYSTEM AT A TEMPERATURE OF FROM 5 TO 50*C., SAID SECOND LIQUID SYSTEM BEING MISCIBLE WITH SAID FIRST LIQUID SYSTEM BUT INCAPABLE OF DISSOLVING THE STYRENE SYNTHETIC RESIN COMPONENT, AND COMPRISING (1) AT LEAST 50% BY VOLUME OF WATER, AND (2) NOT MORE THAN 50% BY VOLUME OF WATERMISCIBLE CONVENTIONAL ORGANIC SOLVENTS OR CARRIERS.

Inventors

• 👤 S Yamamoto
• 👤 S Honda
• 👤 H Shimizu
• 👤 K Oguma

Bibliographic Details