Patent GB-782296-A (GB)
Title: Improvements in or relating to corrosion inhibiting paints
IPC: C09D5/08
Filed: 1955-04-04
Abstract: A paint composition for metallic surfaces has incorporated therein from 1/4 to 2 1/2 per cent by weight, based on the amount of the pigment, of an aliphatic monocarboxylic acid salt of a diamine having the general formula R-NH-(CH2)x-NH2 where R is an aliphatic hydrocarbon radical having from 8 to 22 carbon atoms and x is from 2 to 10.  The salt may be either the mono- or di-acid salt of a fatty acid having from 8 to 22 carbon atoms in the molecule, and both the acid and the radical R may be caprylic, capric, lauric, myristic, palmitic, stearic, oleic, linoleic, linolenic or behenic or a mixture as obtained from tallow, soyabean or coconut oil.  A preferred acid is oleic, and the preferred amine N-tallow trimethylene diamine. Organic or inorganic pigments, including red lead, red iron oxide, white lead, zinc oxide, titanium dioxide, lithopone, carbon black and prussian blue may be used. Useful vehicles include boiled and raw linseed oil, soyabean oil and polyester oils such as glycerine, erythritol or pentaerythritol esters of fatty acids or phthalic acid or their anhydrides.  Driers which can be used include the naphthenates, oxides, resinates, oleates and acetates of cobalt, manganese, lead and zinc.  Pigment extenders such as asbestine, talc, barytes, gypsum, clay or chalk, and suspending agents such as aluminium stearate may be employed.  The paints may be prepared by adding a concentrated solution of the diamine salt in an aliphatic or aromatic solvent or in mineral spirits to a quantity of the vehicle, mixing and grinding the pigment with this, and then adding more of the vehicle along with drier and thinner.ALSO:A paint composition for metallic surfaces has incorporated therein from 1/4 to 2 1/2 per cent by weight, based on the amount of the pigment, of an aliphatic monocarboxylic acid salt of a diamine having the general formula R-NH-(CH2)X-NH2, where R is an aliphatic hydrocarbon radical having from 8 to 22 carbon atoms and X is from 2 to 10.  The salt may be either the mono- or diacid salt of a fatty acid having from 8 to 22 carbon atoms in the molecule, and both the acid and the radical R may be caprylic, capric, lauric, myristic, palmitic, stearic, oleic, linoleic, linolenic or behenic or a mixture as obtained from tallow, soyabean or coconut oil.  A preferred acid is oleic, and the preferred amine N-tallow trimethylene diamine.  Organic or inorganic pigments, including red lead, red iron oxide, white lead, zinc oxide, titanium dioxide, lithopone, carbon black and prussian blue may be used. Useful vehicles include polyester oils such as glycerine, erythritol or pentaerythritol esters of fatty acids or phthalic acid or their anhydrides.  Driers which can be used include the naphthenates, oxides, resinates, oleates and acetates of cobalt, manganese, lead and zinc.  Pigment extenders such as asbestine, talc, barytes, gypsum, clay or chalk, and suspending agents such as aluminium stearate may be employed.  The paints may be prepared by adding a concentrated solution of the diamine salt in an aliphatic or aromatic solvent or in mineral spirits to a quantity of the vehicle, mixing and grinding the pigment with this, and then adding more of the vehicle along with drier and thinner.