| abstract |
FLAME RETARDANT COMPOSITIONS ARE PROVIDED AND METHODS FOR THEIR PREPARATION FOR IMPARTING FLAME RETARDANCY TO VARIOUS RESIN COMPOSITIONS INCLUDING HALOGENATED POLYOLEFINS, POLYOLEFINS IN COMBINATION WITH A HALOGEN SOURCE SUCH AS POLYETHYLENE AND POLYPROPYLENE, POLYESTERS, SYNTHETIC FIBERS, POLYVINCYL CHLORIDE AND COPOLYMERS THEREOF, OTHER POLYMERS AND HALOGENATED POLYMERS, WITH THE FLAME RETARDANCY OF SAID RESINS BEING ACHIEVED IN CONJUNCTION WITH A MUCH HIGHER DEGREE OF TRANSPARENCY TO THE VINYL RESIN COMPOSITIONS WHEN TRANSPARENT RESIN COMPOSITIONS ARE DESIRED, AND A MUCH HIGHER DEGREE OF TRUE COLOR BY REDUCING INTERFERENCE BETWEEN LIGHT AND PIGMENT WHEN COLORED RESIN COMPOSITIONS ARE DESIRED. THE ABOVE IS ACHIEVED BY LOWERING THE REFRACTIVE INDEX OF AN ANTIMONY TRIOXIDE FLAME RETARDANT TO MORE NEARLY COINCIDE WITH A RESIN COMPOSITION INTO WHICH IT MAY BE INTRODUCED BY FORMING AN ADMIXTURE OF ANTIMONY TRIOXIDE WITH AN INORGANIC SALT IN THE RATIO OF 10:90 TO 99:1, HEATING THE ADMIXTURE TO A TEMPERATURE OF BETWEEN ABOUT 650*C. AND 1100*C. FOR A PERIOD OF TIME SUFFICIENT TO MELT, RAPIDLY COOLING THE MELT TO FORM GLASS, REDUCING THE FORMED GLASS TO A PARTICLE SIZE WITHIN THE RANGE OF 60 MICRONS OR LESS, AND INTRODUCING THE GROUND GLAS COMPOSITION INTO THE RESIN COMPOSITION TO IMPART THERETO FLAME RETARDANCY WHILE MAINTAINING LOW OPACITY. FURTHER, RESIN COMPOSITIONS CONTAINING THE FLAME RETARDANT COMPOSITIONS ARE PROVIDED AND THEIR METHOD OF PREPARATION. |