| 摘要 |
<p>The tendency of polymers of a compound containing at least one CH2=C< group to accumulate electrostatic charges is reduced by incorporating in the polymeric material, e.g. as an aqueous paste, a sulphated long chain alcohol having from 10 to 32 carbon atoms per molecule, or a salt thereof, by fluxing in a suitable mixer or milling on malaxating rolls. Polymers mentioned are polyvinyl chloride, polyvinylidene chloride, polystyrene, polymethyl methacrylate, polyethylene, chlorinated polyethylene, copolymers of vinyl chloride with vinyl acetate, vinylidene chloride, methyl methacrylate, butyl methacrylate, ethyl acrylate, acrylonitrile, diethyl fumarate and diethyl maleate, copolymers of vinylidene chloride with acrylonitrile and methyl methacrylate and copolymers of ethylene with vinyl acetate. The sulphated alcohol may be oleyl, cetyl, lauryl, myristyl, stearyl, eicosyl, ceryl, myricyl, sperm oil alcohols and mixtures. The salt of the sulphated alcohol may be either a metal salt, e.g. an alkali metal salt or a salt of an organic base, e.g. triethanolamine. The compositions may include stabilizers such as lead stearate or calcium stearate, lubricants, e.g. stearic acid, pigments such as white lead paste and amorphous carbon and plasticizers such as dibutyl sebacate. The compositions may be made into gramophone records, films, sheets, and filaments or used in coating, moulding, casting or dipping processes.</p> |
