Patent GB-1048993-A (GB)
Title: Coating compositions
Inventor: LIPPOLDT RICHARD FREMONT
IPC: C09D5/20
Filed: 1963-08-01
Abstract: Compositions comprise a homogeneous mixture of 80 to 30 parts by weight of paraffin wax and 20 to 70 parts by weight of an ethylenevinyl acetate copolymer having a vinyl acetate content of 10 to 40% by weight, said mixture further comprising a release agent comprising a partial ester of a polyhydric alcohol and a fatty acid containing 6 to 22 carbon atoms or an acetylated derivative of such an ester.  The wax may be refined paraffin wax, scale wax, mixtures of refined with scale or slack wax or microcrystalline wax, and may be used with waxes of animal or vegetable origin.  Esters listed are glyceryl monolaurate, glyceryl dilaurate, glyceryl monostearate, glyceryl monopalmitate, trimethylolethane monostearate, trimethylolethane dioleate, trimethylolpropane monopalmitate, trimethylolpropane dicaproate glyceryl monocaproate, pentaerythritol dioleate, pentaerythritol dilaurate, glyceryl monolaurate diacetate and glyceryl dilaurate monoacetate.  Examples describe compositions comprising paraffin wax, ethylene-vinyl acetate copolymer and (I) glyceryl monolaurate and (II) an acetylated monoglyceride.  The compositions may be used for melt coating metal surfaces to give temporary, strippable, protective coatings.ALSO:Compositions comprise a homogeneous mixture of 80 to 30 parts by weight of paraffin wax and 20 to 70 parts by weight of an ethylenevinyl acetate copolymer having a vinyl acetate content of 10 to 40% by weight, said mixture further comprising a release agent comprising a partial ester of a polyhydric alcohol and a fatty acid containing 6 to 22 carbon atoms or an acetylated derivative of such an ester.  The wax may be refined paraffin wax, scale wax, or mixtures of refined with scale or slack wax, and may also comprise waxes of animal or vegetable origin. Micro-crystalline waxes may be used.  Many suitable polyhydric alcohols and acids from which the partial esters may be derived are specified, and esters listed are glyceryl monolaurate, glyceryl dilaurate, glyceryl monostearate, glyceryl monopalmitate, trimethylolethane monostearate, trimethylolethane dioleate, trimethylolpropane monopalmitate, trimethylolpropane dicaproate, glyceryl monocaproate, pentaerythritol dioleate, pentaerythritol dilaurate, glyceryl monolaurate diacetate and glyceryl dilaurate monoacetate. Examples describe compositions comprising paraffin wax, ethylene-vinyl acetate copolymers and (I) glyceryl monolaurate and (II) an acetylated monoglyceride.  The compositions may be used to form temporary, strippable, protective coatings on metal surfaces, e.g. by melt dipping.ALSO:Temporary, strippable, protective coatings are applied to metal surfaces by dipping in molten compositions comprising 80 to 90 parts by weight of paraffin wax and 20 to 70 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 10 to 40 per cent by weight, said composition also containing a release agent comprising a partial ester of a polyhydric alcohol and a fatty acid containing 6 to 22 carbon atoms or an acetylated derivative of such an ester.  The wax may be refined paraffin wax, scale wax, mixtures of refined with scale or slack wax or uricrocrystalline wax, and may comprise waxes of animal or vegetable origin.  Esters listed are glyceryl monolaurate, glyceryl dilaurate, glyceryl monostearate, glyceryl manopalimitate, trimethylolethane monostearate, trimethylolethane dioleat, trimethylolpropane dicaproate, trimethylolpropane monopalmitate, glyceryl monocaproate, pentaerythritol dioleate, pentaerythritol dilaurate, glyceryl monolaurate diacetate and glyceryl dilaurate monoacetate.  Examples describe the melt coating of iron and aluminium with compositions comprising paraffin wax, ethylene-vinyl acetate copolymer and (I) glyceryl monolaurate and (II) an acetylate mono glyceride.