| 摘要 |
<p>1,166,366. Coated additives for polymers. NATIONAL LEAD CO. 31 Oct., 1967 [4 Nov., 1966], No. 49521/67. Heading C3P. [Also in Division C1] A coated particulate solid additive for polymers comprises as the coating (a) a wax containing within its molecule a hydroxyl group, or (b) a wax and at least 5% by weight of a hydroxyl-containing material having from 8 to 28 carbon atoms per molecule. Examples of (a) include castor wax and ethylene diricinoleamide. The coating is preferably composed of a fatty alcohol and a wax. Fatty alcohols and other hydroxyl-containing material include normal octyl alcohol, 2-ethyl hexanol, stearyl alcohol, montanyl alcohol, oleyl alcohol, ricinoleic acid and methyl 12-hydroxy-stearate. The wax component may be either of the natural or synthetic type, e.g. paraffin wax, ester waxes such as spermaceti, mineral waxes such as montan wax, amide waxes such as ethylene distearamide and ethylene diricinoleamide, halogenated hydrocarbon waxes such as chlorinated paraffin waxes and chlorinated naphthalenes and ketone waxes such as stearone. The wax should preferably have a melting point of from 50‹ to 150‹ C., and the coating preferably comprises from 5 to 50% by weight of the hydroxyl-containing material. The solid additive substrate may include fillers such as BaSO 4 , clays, CaC0 3 , silicates, MgO, pigments, such as TiO 2 , ZnO, lead chromate, cadmium sulphides, cadmium selenide, zinc sulphide, basic carbonate of white lead, stabilizers such as tribasic lead sulphate, basic lead chlorosilicate, dibutyl tin oxide, flame retardants such as antimony oxide, slip agents, anti-block agents, vulcanizing materials and accelerators. The weight of the coating is preferably from 5 to 50% of that of the solid substrate additive. In the examples tribasic lead sulphate coated with paraffin wax and stearyl alcohol is used to stabilize polyvinyl chloride dry blend compositions prepared in high-speed mixers. Tribasic lead sulphate coated with spermaceti wax and stearyl alcohol is used to stabilize vinyl plastics compositions comprising a P.V.C. resin, an acrylic processing aid and calcium stearate lubricant. TiO 2 coated with paraffin wax and stearyl alcohol colour stabilizes a P.V.C. composition of a P.V.C. resin, an organothio tin stabilizer and calcium stearate lubricant. TiO 2 coated with paraffin wax and stearyl alcohol is used to stabilize chloro-sulphonated polyethylene rubber. Antimony silico oxide coated with paraffin wax and stearyl alcohol is used to stabilize a high density polyethylene resin modified with a 70% chlorinated paraffin.</p> |
