Abstract Shaped articles such as fibers and films having durable, highly flame-retardant property comprising a halogen-containing polymer and polyvinyl alcohol including its acetal, as principal constituents, and tin substantially in the form of stannic acid. Said shaped articles are produced by a method (A) comprising subjecting shaped articles such as polymer blend fibers containing a halogen-containing polymer and polyvinyl alcohol, as principal constituents, to acetalization in an acetalizing bath containing a tin salt of a strong acid, and converting it to stannic acid substantially afterwards by increase of pH in the articles; alternatively by a method (B) comprising blending an aqueous solution of polyvinyl alcohol, an emulsion of a halogencontaining polymer and an aqueous dispersion of stannic acid or stannic acid anhydride, and subjecting the resulting solution of the polymer blend to emulsion spinning technique; or by a method (C) comprising treating shaped articles such as polymer blend fibers containing, as principal constituents, a halogencontaining polymer and partially acetalized polyvinyl alcohol, with an aqueous solution of a tin salt of a strong acid and converting it to stannic acid substantially afterward by increase of pH in the shaped articles.
A METHOD FOR PRODUCING SHAPED ARTICLES HAVING DURABLE, HIGHLY FLAME-RETARDANT PROPERTIES WHICH COMPRISES A CHLORINECONTAINING POLYMER AND PARTIALLY ACETALIZED POLYVINYL ALCOHOL, AS PRINCIPAL CONSTITUENTS, IN A WEIGHT RATIO OF 2:8 TO 8:2 AND 0.1 TO 15% OF TIN SUBSTANTIALLY IN THE FORM OF STANNIC ACID BASED UPON THE TOTAL WEIGHT OF THE ABOVE-MENTION PRINCIPAL CTONSTITUENTS, WHICH METHOD COMPRISES MIXING AN AQUEOUS EMULSION OF A CHLORINE POLIMER, AN AQUEOUS SOLUTION OF POLYVINYL ALCOHOL AND AN AQUEOUS DISPERSION OF STANNIC ACID TO GIVE A DOPE HAVING A RATIO OF POLYVINYL ALCOHOL TO SAID CHLORINE CONTAINING POLYMER OF 2:8-8:2 AND A STANNIC CONTENT OF 0.15-5 PERCENT PER TOTAL WEIGHT OF POLYMERS AND EXTRUDING SAID DOPE INTO A COAGULATING BATH TO OBTAIN COAGULATED SHAPED ARTICLES, FOLLOWED BY CONVENTIONAL AFTER-PROCESSING INCLUDING INSOLUBILIZING OF POLYVINYL ALCOHOL BY ACETALIZATION SAID CHLORINE-CONTANING POLYMER BEING A MEMBER SELECTED FROM THE GROUP CONSISTING OF POLYMERS OF VINYL CHLORIDE, VINYLIDENE CHLORIDE, CHLOROPRENE, COPOLYMERS OF THE FOREGOING COMPOUNDS, COPOLYMERS OF ANY OF THESE COMPOUNDS WITH OTHER MONOMERS COPOLYMERIZABLE THEREWITH, CHLORINATED POLYVINYL CHLORIDE, CHLORINATED POLYETHYLENE, CHLORINATED POLY-PROPYLENE AND POLYMER-BLENDS OF THE FOREGOING POLYMERS.
Claim 2
Independent Claim
180 words
A METHOD FOR PRODUCING SHAPED ARTICLES HAVING DURABLE, HIGHLY FLAME-RETARDANT PROPERTIES WHICH COMPRISES A CHLORINECONTAINING POLYMER AND PARTIALLY ACETALIZED POLYVINYL ALCOHOL, AS PRINCIPAL CONSTITUENTS, IN A WEIGHT RATIO OF 2:8 TO 8:2 AND 0.1 TO 15% OF TIN SUBSTANTIALLY IN THE FORM OF STANNIC ACID BASED UPON THE TOTAL WEIGHT OF THE ABOVE-MENTION PRINCIPAL CTONSTITUENTS, WHICH METHOD COMPRISES MIXING AN AQUEOUS EMULSION OF A CHLORINE POLIMER, AN AQUEOUS SOLUTION OF POLYVINYL ALCOHOL AND AN AQUEOUS DISPERSION OF STANNIC ACID TO GIVE A DOPE HAVING A RATIO OF POLYVINYL ALCOHOL TO SAID CHLORINE CONTAINING POLYMER OF 2:8-8:2 AND A STANNIC CONTENT OF 0.15-5 PERCENT PER TOTAL WEIGHT OF POLYMERS AND EXTRUDING SAID DOPE INTO A COAGULATING BATH TO OBTAIN COAGULATED SHAPED ARTICLES, FOLLOWED BY CONVENTIONAL AFTER-PROCESSING INCLUDING INSOLUBILIZING OF POLYVINYL ALCOHOL BY ACETALIZATION SAID CHLORINE-CONTANING POLYMER BEING A MEMBER SELECTED FROM THE GROUP CONSISTING OF POLYMERS OF VINYL CHLORIDE, VINYLIDENE CHLORIDE, CHLOROPRENE, COPOLYMERS OF THE FOREGOING COMPOUNDS, COPOLYMERS OF ANY OF THESE COMPOUNDS WITH OTHER MONOMERS COPOLYMERIZABLE THEREWITH, CHLORINATED POLYVINYL CHLORIDE, CHLORINATED POLYETHYLENE, CHLORINATED POLY-PROPYLENE AND POLYMER-BLENDS OF THE FOREGOING POLYMERS.
Claim 3
Dependent Claim
72 words
A method according to claim 1 wherein said shaped articles are in the form of fibers, said aqueous emulsion of a chlorine-containing polymer is a 25 to 40 percent aqueous emulsion of a graft copolymer consisting of polyvinyl alcohol as a backbone and polyvinyl chloride as grafts, said aqueous solution of polyvinyl alcohol has 15-20 percent by weight concentration and said aqueous dispersison of stannic acid has 10-25 percent by weighT concentration.