Disclosed herein are thermoplastic polymer matrix compositions for a continuous fiber reinforced thermoplastic composite article, comprising at least one of poly(vinyl chloride) and/or chlorinated poly(vinyl chloride). Also disclosed herein are methods for formulating thermoplastic polymer matrix compositions suitable for impregnating continuous fibers for continuous fiber-reinforced thermoplastic composite articles, wherein the thermoplastic polymer matrix compositions have sufficient viscosity and thermal stability to impregnate continuous fibers and withstand thermal treatment at high temperatures and long residence times without decomposing.

To provide a method for producing a fluororesin composition with less coloring and excellent in mechanical strength, even by using a fluororesin powder with a heat history of being heated to the melting point or higher, and such a fluororesin composition. A method for producing a fluororesin composition, which comprises mixing a mixture of a fluororesin powder with a heat history of being heated to the melting point or higher and a water-soluble organic solvent, with a fluororesin dispersion produced by emulsion polymerization, containing no nonionic surfactant.

The present invention provides a resin sheet containing a chlorinated polyvinyl chloride and a dimethyltin-based compound, in which the chlorine content of the chlorinated polyvinyl chloride is 60% by mass or more, and the deflection temperature under load of the resin sheet measured in accordance with a JIS K 7191-1 A method is 80 C. or higher.

A transparent flame-retardant sheet having a high chlorine content is provided. The transparent flame-retardant sheet is made of a polyvinyl chloride composition that includes 100 parts by weight of a polyvinyl chloride raw material component, 0.1 to 1 parts by weight of at least one carbon forming agent, and 2 to 5 parts by weight of at least one heat stabilizer. The polyvinyl chloride raw material component includes a polyvinyl chloride raw material and a chlorinated polyvinyl chloride raw material in a content ratio of 1:1.22 to 1:4. Therefore, the transparent flame-retardant sheet has a fire propagation index (FPI) of less than 6 and a smoke damage index (SDI) of less than 0.4 according to the FM4910 standard under the condition of having a thickness of 5 mm.