Patent ID: 9018278
Filing Date: 2015-04-28
Classification: C08K,C08L,F21V,G02B

Abstract:
1. A surface treated calcium carbonate filler for polyolefin resins having durability, weatherability and stability with time, which comprises calcium carbonate particles, the surface of which has been treated with at least one surface active agent (A) selected from the group consisting of the saturated fatty acids capric acid, lauric acid, myristic acid, palmitic acid and stearic acid, the unsaturated fatty acids oleic acid, linoleic acid and linolenic acid, and salts thereof and with at least one compound (B) having the ability to chelate alkaline earth metals, the compound (B) being selected from the group consisting of nitrilotrismethylene phosphonic acid, aminotrimethylene phosphonic acid, phosphonobutane tricarboxylic acid, phosphonomethylethylene diamine and salts thereof, said filler having an average particle diameter D50 of from 0.1 to 0.5 μm, a BET specific surface area Sw of from 3 to 30 m 2 /g and a surface treatment ratio As of from 0.05 to 0.3 m 2 /g, wherein: D50: average particle diameter (μm) of particles in 50% cumulative total by weight from the larger particle size in particle size distribution by laser diffraction spectrometry; Sw: BET specific surface area (m As: surface treatment ratio per unit specific surface area calculated according to the following formula: {heat loss per 1 g of surface treated calcium carbonate at a temperature in the range of from 200° C. to 500° C. (mg/g)}/Sw (g/m