Patent GB-880068-A (GB)
Title: Coating compositions
Inventor: SHEARING HERBERT JACKSON
IPC: C08G18/18
Filed: 1958-08-15
Abstract: An improved non-foamed polyurethane coating composition comprises an organic polyisocyanate, a material containing at least 2 hydroxyl groups per molecule, such as a polyester, polyesteramide or polyether, and a tertiary amine containing at least one group which is reactive towards isocyanates, the tertiary amine being present in a proportion of between 0,05% and 10% of the weight of the hydroxyl group-containing material. The compositions may be applied to wood, metals, concrete, asbestos, paper, plastics, rubbers, glass and fabrics by brushing, spraying or dipping.  Reactive groups in the amine include hydroxy, primary and secondary amino, ureido, amido and monosubstituted amido groups.  Tertiary amines specified are triethanolamine and bis-(hydroxypropyl)-methylpiperazine, 2-diethylamino-ethanol, N-(2-diethylaminoethyl) benzamide, N-(2-diethylaminoethyl)-acetamide, N-(3-diethylaminopropyl)-acetamide and b -diethylaminopropionamide.  Polyesters and polyesteramide-forming reactants, polyethers and polyisocyanates are listed.  The components of the coating compositions may be mixed optionally with pigments, flowing-out agents such as ethyl cellulose and cellulose acetobutyrate and solvents such as cyclohexanone, methyl isobutyl ketone, butyl acetate, ethyl acetate or their mixtures.  The polyisocyanates and hydroxy group-containing material may be first partially interacted and the product then dissolved, possibly with addition of further quantities of polyisocyanate or hydroxyl group-containing material.  Examples describe compositions of (1) a polyester from hexanetriol, adipic acid and phthalic anhydride, nitrocellulose and ethyl cellulose, cyclohexanone, methyl isobutyl ketone, trimerised 2:4- and 2:6- tolylene diisocyanates in ethyl acetate and triethanolamine; (2) a similar composition in which the polyester is obtained from glycerol, ethylene glycol and adipic acid; (3) and (4) ingredients as in (1) and (2), but with the substitution of b -diethyl-aminoethanol for the triethanolamine; (5) the ingredients of (1) but replacing triethanolamine by N:N1-bis-(hydroxypropyl)-2-methyl-piperazine; (6) the polyester of (1), a xylene-butanol solution of urea-formaldehyde resin, cyclohexanone, methyl isobutyl ketone, trimerised 2:4- and 2:6-tolylene diisocyanates and triethanolamine; (7) polypropylene glycol, butylated urea-formaldehyde lacquer vehicle, cyclohexanone, methyl isobutyl ketone, a reaction product, still containing free isocyanate groups, of glycerol, diethylene glycol and 2:4-tolylene diisocyanate, and triethanolamine; (8) a diglycerol-propylene oxide reaction product, butylated urea-formaldehyde lacquer, cyclohexanone, methyl isobutyl ketone, an isocyanate as used in (7) and b -diethylaminoethanol.ALSO:An improved non-foamed polyurethane coating composition comprises an organic polyisocyanate, a material containing at least two hydroxyl groups per molecule, such as a polyester, polyesteramide or polyether, and a tertiary amine containing at least one group which is reactive towards isocyanates, the tertiary amine being present in a proportion of between 0,05% and 10% of the weight of the hydroxyl group-containing material. Reactive groups referred to are hydroxyl, primary and secondary amino, ureido, amido and mono-substituted amido groups.  Tertiary amines specified are triethanolamine and bis- (hydroxypropyl)-methylpiperazine (which are preferred),2-diethylamino-ethylamine, 2-diethylamino-ethanol, N-(2-diethylaminoethyl) benzamide, N-(2-diethylaminoethyl)-acetamide, N-(3-diethylaminopropyl)-acetamide and b -diethylaminopropionamide. Polyesters and polyesteramide-forming reactants, polyethers and polyisocyanates are listed.  The components of the coating compositions may be mixed optionally, pigments, flowing-out agents such as ethyl cellulose and cellulose acetobutyrate and solvents such as cyclobexanone, methyl isobutyl ketone, butyl acetate, ethyl acetate or their mixtures.  The polyisocyanate and hydroxyl group-containing material may be first partially interacted and the product then dissolved, possibly with addition of further quantities of polyisocyanate or hydroxyl group-containing material.  Examples describe compositions of (1) a polyester from hexanetriol, adipic acid and phthalic anhydride, nitrocellulose and ethyl cellulose, cyclohexanone, methyl isobutyl ketone, trimerized 2:4- and 2:6- tolylene diisocyanates in ethyl acetate and triethanolamine; (2) a similar composition in which the polyester is obtained from glycerol, ethylene glycol and adipic acid; (3) and (4) ingredients as in (1) and (2), but with the substitution of b -diethylaminoethanol for the triethanolamine; (5) the ingredients of (1), but replacing triethanolamine by N:N1-bis-(hydroxypropyl)-2-methyl-piperazine; (6) the polyester of (1), a xylene-butanol solution of urea-formaldehyde resin, cyclohexanone, methyl isobutyl ketone, trimerized 2:4- and 2:6-tolylene diisocyanates and triethanolamine; (7) polypropylene glycol, butylated urea-formaldehyde lacquer vehicle, cyclohexanone, methyl isobutyl ketone, a reaction product, still containing free isocyanate groups, of glycerol, diethylene glycol and 2:4-tolylene diisocyanate, and triethanolamine; (8) a diglycerolpropylene oxide reaction product, butylated urea-formaldehyde lacquer, cyclohexanone, methyl isobutyl ketone, an isocyanate as used in (7) and b -diethyl-aminoethanol.