Patent GB-782576-A (GB)
Title: Improvements in or relating to paints or like coating materials
IPC: C09D101/08
Filed: 1954-09-04
Abstract: A paint, lacquer, varnish or like coating material of the type in which the paint or like film is formed by evaporation of a solvent, is produced in solid form by mixing together a soluble film-forming base for the said coating material and colouring matter, together with other known paint constituents, if desired, in the presence of sufficient volatile solvent for the base to produce a semi-solid or gel-like composition, moulding this to a desired shape and removing the solvent.  The film-forming base may be, e.g., a cellulose derivative such as nitrocellulose or ethyl cellulose, or a synthetic resin, e.g. acrylic, vinyl, styrene, allyl, alkyd and phenolic resins.  Natural, e.g. dammar, shellac, mastic, sandarac, and ester gum, may be incorporated.  The colouring matter may be inorganic or organic pigments and dyes, e.g. carbon black, ultramarine, phthalocyanine blue, toluidine red, chrome yellow, vat dyes of the anthraquinone, indigo and sulphur types, and inorganic chrome and cobalt pigments.  The solvent may be a straight solvent or a mixture and may be selected from esters, alcohols, ketones, hydrocarbons, or substituted hydrocarbons, e.g. nitrobenzene, chlorotoluene or nitroethane. Plasticisers, fluorescing agents, surface-active agents or stabilizers, e.g. phenylbeta-naphthylamine, dibutyl tin, barium ricinoleate and cadmium 2-ethyl hexoate may also be incorporated. The finely ground solid ingredients may be mixed with the solvent in a paddle mixer or ball mill.  The mix is transferred to moulds and the solvent is allowed to evaporate or is driven off.  The paint may be applied to the surface to be coated by means of a brush dipped in a solvent, e.g. acetone or a mixture of acetone and alcohol.ALSO:A paint, lacquer, varnish or like coating material is produced in solid form by mixing together a soluble film-forming base, which may be a cellulose derivative such as ethyl cellulose or nitrocellulose or a mixture thereof with synthetic resins, and colouring matter, together with other known paint constituents if desired, in the presence of sufficient volatile solvent for the base to produce a semi-solid or gel-like composition, moulding this to a desired shape, and removing the solvent.  The synthetic resins may be acrylic, vinyl, styrene, allyl, alkyd or phenolic resins, and natural resins, e.g. dammar, shellac, mastic, sandarac or ester gum, may also be added.  The colouring matter may be inorganic or organic pigments or dyes, e.g. carbon black, ultramarine, phthalocyanine blue, toluidine red, vat dyes of the anthraquinone, indigo and sulphur colour types, or chrome or cobalt pigments.  The solvent may be a straight solvent or a mixture and may be selected from esters, alcohols, ketones, hydrocarbons or substituted hydrocarbons, e.g. nitrobenzene, chlorotoluene or nitroethane.  Plasticizers, fluorescing agents, surface-active agents or stabilizers, e.g. phenyl-beta-naphthylamine, dibutyl tin, barium ricinoleate or cadmium 2-ethylhexoate, may also be incorporated.  The finely ground solid ingredients may be mixed with the solvent in a paddle mixer or ball mill, the mix being transferred to moulds and the solvent allowed to evaporate or being driven off.