Calcium hydroxide, resin composition containing the same, and molded article containing the composition

摘要

There are provided calcium hydroxide having a large specific surface area, a resin composition comprising the calcium hydroxide and having excellent thermal stability, and a molded article and a stabilizer for synthetic resins which comprise the calcium hydroxide.;There are provided a calcium hydroxide compound represented by the following formula (1):
Ca(OH)2-nx(An−)x  (1)
(wherein n represents an integer of 1 to 4, x represents a number of 0.001 to 0.2, and An− represents an anion derived from at least one compound selected from the group consisting of a silicon-based compound, a phosphorus-based compound, an aluminum-based compound, an inorganic acid and an organic acid.),

and a synthetic resin, a molded article and a stabilizer for synthetic resins which comprise the compound.

主权项

1. A resin composition comprising:
(i) 100 parts by weight of synthetic resin, (ii) 0.1 to 10 parts by weight of calcium hydroxide produced by reacting an aqueous solution of a water-soluble calcium salt with an aqueous solution of an alkali metal hydroxide in the presence of an organosilicon-based compound, wherein the water-soluble calcium salt is calcium chloride or calcium nitrate, and wherein the alkali metal hydroxide is sodium hydroxide or potassium hydroxide,
wherein the calcium hydroxide:(a) is represented by the following formula (1):
Ca(OH)2-nx(An−)x  (1)wherein n is 4, x represents a number of 0.001 to 0.2, and An− is SiO44−,(b) has an average secondary particle diameter, measured by a laser diffraction scattering method, of 0.1 to 7 μm, and(c) has a BET method specific surface area of 5 to 40 m2/g, and (iii) 0.1 to 10 parts by weight of hydrotalcite represented by the following formula (2):
{(Mg)y(Zn)z}1-x(Al)x(OH)2(An−)x/n.mH2O  (2)wherein An− represents ClO4−, SO42−, CO32− or a mixture thereof, n is 1 or 2, and x, y, z and m satisfy y+z=1, 0.1