Patents
The PVC compositions described herein comprise PVC resin, a coprecipitated rare earth additive, and an inorganic flame retardant. These PVC compositions demonstrate improved fire resistance and are UL94 rated at a sample thickness of approximately 0.8 mm of V-2 or greater. The coprecipitated rare earth additive contains a rare earth and one or more of zinc, aluminum, and magnesium, where the coprecipitated rare earth additive contains approximately 5 to 95% by weight of rare earths measured on an oxide basis. The inorganic flame retardant may be ATO, MDH, ATH, or mixtures thereof. The coprecipitated rare earth additive provides improved properties over an identical PVC composition containing the components of the coprecipitated additive, but added to the PVC composition as a mixture of these components rather than as a coprecipitant.
A polymer composition comprises a first ethylene-based polymer having a crystallinity at 110°C of 25% by weight or greater, as measured by the crystallinity test; a second ethylene-based polymer having a crystallinity at 23°C of 40% by weight or less, as measured by the crystallinity test; and 40% by weight or greater of a halogen-free flame retardant filler.
The PVC compositions described herein comprise PVC resin, a rare earth compound and an inorganic flame retardant. These PVC compositions demonstrate improved fire resistance and are UL94 rated with a sample thickness of approximately 0.8 mm of V-2 or greater. The rare earth compounds may be rare earth hydroxides, rare earth oxide hydrates and mixtures thereof. The inorganic flame retardant may be antimony trioxide (ATO), magnesium dihydroxide (MDH), aluminum trihydrate (ATH) and mixtures thereof. The combination of the rare earth compound and the inorganic flame retardant forms a synergistic partnership.