Fine particulate synthetic chalcoalumite compounds, process for their production, and heat insulator and agricultural film containing the fine particulate synthetic chalcoalumite compounds

A resin composition comprising:

• 100 parts by weight of a thermoplastic resin;
• and
• 1-30 parts by weight of a synthetic chalcoalumite compound represented by formula (1) below
• (M12+)a−x(M22+)xAl3+4(OH)b(An−)c. mH2O (1)
• in which M12+ stands for Zn2+ or Cu2+,
• M22+ is at least one divalent metal ion selected from Ni2+, Co2+, Cu2+, Zn2+ and Mg2+,
• a is 0.3<a<2.0, with the proviso that M1 and M2 are not the same,
• x is 0≦x≦1.0, x<a,
• b is 10<b<14,
• An− is at least one ion selected from SO42−, HPO42−, CO32−, SO32−, HPO32−, NO3−, H2PO4−, Cl−, OH− and silicate ion,
• c is 0.4<c<2.0 and
• m is 0-4,
• which has an average secondary particle diameter of not more than about 3 μm and a BET specific surface area of not more than about 30 m2/g.

A resin composition comprising:

• 100 parts by weight of a thermoplastic resin;
• and
• 1-30 parts by weight of a heat insulating agent which is a synthetic chalcoalumite compound represented by formula (1) below
• (M12+)a−x(M22+)xAl3+4(OH)b(An−)c. mH2O (1)
• in which M12+ stands for Zn2+ or Cu2+,
• M22+ is at least one divalent metal ion selected from Ni2+, Co2+, Cu2+, Zn2+ and Mg2+,
• a is 0.3<a<2.0, with the proviso that M1 and M2 are not the same,
• x is 0 ≦x<1.0, x<a,
• b is 10<b<14,
• An− is at least one ion selected from SO42−, HPO42−, CO32−, SO32−, HPO32−, NO32−, H2PO4−, Cl−, OH− and silicate ion,
• c is 0.4<c<2.0 and
• m is 0-4,
• which has an average secondary particle diameter of not more than about 3 μm and a BET specific surface area of not more than about 30 m2/g, and which has been surface-treated with at least one member selected from the group consisting of higher fatty acids, anionic surfactants, phosphoric acid esters, silane-containing coupling agents, titanate-containing coupling agents, aluminum-containing coupling agents and fatty acid esters of polyhydric alcohols.

An agricultural film comprising a resin composition containing

• 100 parts by weight of a thermoplastic resin;
• and
• 1-30 parts by weight of a synthetic chalcoalumite compound represented by formula (1) below
• (M12+)a−X(M22+)xAl3+4(OH)b(An−)c. mH2O (1)
• in which M12+ stands for Zn2+ or Cu2+,
• M22+ is at least one divalent metal ion selected from Ni2+, Co2+, Cu2+, Zn2+ and Mg2+,
• a is 0.3<a<2.0, with the proviso that M1 and M2 are not the same,
• x is 0≦x≦1.0, x<a,
• b is 10<b<14,
• An− is at least one ion selected from SO42−, HPO42−,
• CO32−, SO32−, HPO32−, NO3−, H2PO4−, Cl−, OH− and silicate ion,
• c is 0.4<c<2.0 and
• m is 0-4,
• which has an average secondary particle diameter of not more than about 3 μm and a BET specific surface area of not more than about 30 m2/g;
• said resin composition having been formed into a film structure.

An agricultural film comprising a resin composition containing

• 100 parts by weight of a thermoplastic resin;
• and
• 1-30 parts by weight of a heat insulating agent which is a synthetic chalcoalumite compound represented by formula (1) below
• (M12+)a−X(M2 2+)xAl3+4(OH)b(An−)c. mH2O (1)
• in which M12+ stands for Zn2+ or Cu2+,
• M22+ is at least one divalent metal ion selected from Ni2+, Co2+, Cu2+, Zn2+ and Mg2+,
• a is 0.3<a<2.0, with the proviso that M1 and M2 are not the same,
• x is 0≦x≦1.0, x<a,
• b is 10<b<14,
• An− is at least one ion selected from SO42−, HPO42−, CO32−, SO32−, HPO32−, NO3−, H2PO4−, Cl−, OH− and silicate ion,
• c is 0.4<c<2.0 and
• m is 0-4,
• which has an average secondary particle diameter of not more than about 3 μm and a BET specific surface area of not more than about 30 m2/g, and which has been surface-treated with at least one member selected from the group consisting of higher fatty acids, anionic surfactants, phosphoric acid esters, silane-containing coupling agents, titanate-containing coupling agents, aluminum-containing coupling agents and fatty acid esters of polyhydric alcohols;
• said resin composition having been formed into a film structure.