Abstract: Dicalcium phosphate dihydrate compositions having improved monofluorophosphate compatibility are prepared by adding pyrophosphoric acid to the dicalcium phosphate reactor, terminating the reaction by which the dicalcium phosphate is formed at a pH ranging from 4.9 to 5.5 and blending the final product with a stabilizing agent.

Abstract: An internally plasticized copolymer of from about 50% to about 85%, by weight, vinyl chloride, from about 3% to about 47%, by weight, of a C.sub.6 -C.sub.10 alkyl acrylate, and from about 3% to about 47%, by weight, of a bis(hydrocarbyl)vinylphosphonate is disclosed. This copolymer can be formed by using conventional suspension, emulsion, solution or bulk polymerization procedures and can be utilized without any substantial amount of added external plasticizer in those applications in which externally plasticized vinyl chloride polymers are normally used. The use of such a resin overcomes the plasticizer migration problems associated with externally plasticized polyvinyl chloride systems.