Patent ID: 7078459

Claim:
A halogen-containing polymer composition comprising a halogen-containing polymer and a heat stabilizing amount of a liquid overbased Ca/Ba/Zn trimetal stabilizer composition comprising a mixture of a barium compound stabilizer and a zinc compound stabilizer, and a shelf stable haze free liquid of an overbased calcium salt of a fatty acid comprising, (a) a calcium salt of carbonate, (b) a calcium carboxylate of a fatty acid, (c) a liquid hydrocarbon, and (d) an aliphatic alcohol having at least 8 carbon atoms, said liquid being essentially free of a phenol or phenolic derivative wherein said shelf stable haze free liquid of an overbased calcium salt of a fatty acid is prepared by a process comprising, reacting a calcium base and a fatty acid with an equivalent ratio of calcium base to fatty acid being greater than 1:1 in the presence of liquid hydrocarbon, carbonating the mixture to produce amorphous calcium carbonate, adding during carbonation a dispersion of calcium base, a liquid hydrocarbon and an aliphatic alcohol having at least 8 carbon atoms in relative amounts at a controlled rate of calcium base to produce a stable haze free liquid reaction product, and removing water from the reaction product to obtain a shelf stable haze free liquid overbased product containing calcium carboxylate of a fatty acid and a calcium carbonate; said mixture of barium and zinc compound stabilizers and liquid overbased calcium carboxylate are in relative amounts to provide said liquid overbased Ca/Ba/Zn trimetal stabilizer for stabilizing the halogen-containing polymer.