Patent GB-1106211-A (GB)
Title: Article having iridescent surface and method of making same
IPC: B44F1/14
Filed: 1965-02-26
Abstract: Coating composition comprises (by weight) 10 parts methyl methacrylate resin, 3 parts polyvinyl chloride, 1 part cellulose acetate butyrate, 60 parts methylethyl ketone, 26 parts toluene, and 366 parts butyl acetate.ALSO:Iridescent plastics laminates are produced by rubbing a small amount of a pigment on a plastics base material, having a smooth, glassy surface, and superimposing a thin, transparent liquid film of varying thickness from point to point, the average thickness being 0.100 to 0.175 microns and may be tinted. Materials 50 square meters per gram.  Suitable pigments mentioned include carbon black, aluminium powder, bismuth oxychloride, phthalocyanine pigments.  The plastics base material may be any flexible plastics material that can be produced with a glossy surface and to which a transparent film may be adhered, e.g. vinyl resins containing carbon black.  Suitable materials mentioned are plasticized polyvinyl chloride compositions including copolymers of vinyl chloride and vinyl acetate, polyvinyl ethers, polyvinyl butyrate, polyethylene, polypropylene, polymers and copolymers of acrylates and methacrylates, ethyl cellulose and other cellulose derivatives.  Plasticizers, antidegradents, stabilizers, pigments and other additives may be used.  An example of a suitable composition is 100 parts polyvinyl chloride, 42 parts of dioctylphthalate, 2 parts of stabilizer, e.g. organic phosphate, barium cadmium soaps, and 3.5 parts of black pigment, e.g. carbon black.  The transparent coating may have an average thickness of 0.100 to 0.175 microns and may be tinted.  Materials mentioned are a polyvinyl butyral solution when used with carbon black, acrylic resins including polymethyl methacrylate, copolymers of methyl methacrylate and ethylacrylate, and terpolymers of methyl methacrylate, methylacrylate, and acrylic acid.  The solvent must not solubilize the base layer and may be butyl acetate.  The solution may contain 2.5 to 3.5% solids.  An example of a suitable composition when used with carbon black in the base material and as the pigment rubbed on the base material is 25 parts of a 10% solution of polyvinyl butyral in methyl alcohol, 1 part of trimethyl urea, 63 parts of methyl acohol and 11 parts of butyl alcohol.  The laminates may have a backing adhered to the plastics base material by an adhesive which also prevents impregnation into the backing by hot plastics matter.  The backing may be a woven or nonwoven fabric such as canvas, twill, sateen, or may be paper, or cotton, nylon, rayon, polyester or mixtures thereof. The adhesive may be a natural or synthetic rubber or plastic in a suitable solvent or any other suitable material.  The base layer may be applied by calendering and polished by contacting with a highly polished surface under pressure to provide a glossy surface, e.g. by passing between the nip of a pair of rolls, one highly polished and the other of rubber.  The pigment may be distributed on the glossy surface by hand or mechanically, and rubbed against the surface by polishing.  The laminate is then passed between rollers to receive the transparent top coat of non-uniform thickness, one of the rollers having a soft spongy surface so as to impose by a reverse image process a layer of varying thickness.  This roller may be of rubber or may be of rubber covered with a fabric having thickened portions to impose a suitable design.  The laminate may be passed between embossing rolls.  The drying may be in two stages, the first at 250 to 300 DEG F and the second at 400 to 500 DEG F.  A possible iridescent pattern is also illustrated.