Patent GB-836335-A (GB)
Title: Improvements in or relating to the preservation of aqueous dispersions of synthetic polymerized olefine substances
IPC: C09D109/10
Filed: 1958-06-26
Abstract: Synthetic latex formulations for application to masonry, wood and metal are preserved against bacterial decomposition by incorporation of a nitroalcohol, i.e. a compound having one nitro group and at least one hydroxyl group on different saturated carbon atoms.  The nitroalcohols are exemplified by tris-(hydroxymethyl) - nitromethane, 1 - nitro - 2 - butanol, 2 - nitro - 1 - butanol, 2 - nitroethanol, 3 - nitro - 2 - butanol, 2 - methyl - 2 - nitro - 1 - propanol, 2 - methyl - 1 - nitro - 2 - propanol, 2 - methyl - 2 - nitro - 1,3 - propanediol, 2 - ethyl - 2 - nitro - 1,3 - propanediol, 3 - methyl - 3 - nitro - 2 - butanol, 2 - nitro - 1,3 - propanediol, 2,2 - dimethyl - 3 - (2 - methyl - 2 - nitropropyl) - amino-1 - propanol, 2 - nitro - 3 - hexanol, 3 - nitro - 2 - pentanol, 3 - nitro - 4 - heptanol, 2 - methyl - 2 - nitro - 3 - hexanol, 2 - nitro - 1 - pentanol, 3 - nitro - 2 - hexanol, 5 - nitro - 4 - octanol, 2 - methyl - 2 - nitro - 1 - butanol, 3 - methyl - 3 - nitro - 2 - pentanol, 3 - methyl - 3 - nitro - 4 - heptanol, 3 - methyl - 2 - nitro - 1 - butanol, 4 - methyl - 3 - nitro - 2 - pentanol, 2 - methyl - 3 - nitro - 4 - heptanol, 2 - nitro - 2 - propyl - 1,3 - propanediol, 2 - nitro - 2 - isopropyl - 1,2 - propanediol, 3 - nitro - 3 - methylpentanediol, 1 - phenyl - 2 - nitroethanol, 1 - phenyl - 2 - nitro - 1 - propanol, 1 - (3,4 - dichlorophenyl) - 2 - nitro - 1 - butanol, 1 - phenyl - 2 - nitro - 1 - butanol, 1 - (4 - chlorophenyl) - 2 - nitro - 1 - propanol, 1 - (4 - chlorophenyl) - 2 - nitro - 1 - butanol, 1 - (p - tolyl) - 2 - nitro - 1 - propanol, 1 - (4 - chlorophenyl) - 2 - nitro - 1 - propanol, 1 - (p - tolyl) - 2 - nitro - 1 - butanol, 1 - (2,4 - dichlorophenyl) - 2 - nitro - 1 - propanol, 1 - (2,4 - dichlorophenyl) - 2 - nitro - 1 - butanol, 1 - (4 - bromophenyl) - 2 - nitro - 1 - propanol, 1 - (4 - isopropoxyphenyl) - 2 - nitro - 1 - propanol, 1 - (4 - tertiary - butylphenyl) - 2 - nitro - 1 - ethanol, 1 - (o,p - xylyl) - 2 - nitro - 1 - ethanol, 1 - (2,6 - dichlorophenyl) - 2 - nitro - 1 - propanol, 2 - nitro - 2 - phenyl - 1,3 - propanediol, 2 - nitro - 3 - (o - tolyl) 8 1,3 - propanediol and 2 - nitro - 2 - (4 - methoxyphenyl) - 1,3 - propanediol.  The nitroalcohol may form at least 0.002% of the wet weight of the synthetic latex.  The nitroalcohol may be incorporated as a water, water-ethanol or methanol solution.  The synthetic latices are aqueous colloidal dispersions of polymers of olefine monomers or copolymers of such monomers and conjugated diolefines, such as butadiene; vinyl and vinylidene chloride polymers, vinyl acetate homopolymers and copolymers, acrylic ester, such as ethyl acrylate, methacrylic ester, such as methyl methacrylate, and styrene homopolymers and copolymers, especially copolymers of 25-75% butadiene to 75-25% vinyl aromatic hydrocarbon. The latex formulations may contain plasticizers, stabilizers, emulsifying agents such as sodium oleate, sodium sulphate esters of higher alcohols, sodium sulphonates of alkylated naphthalene, and buffers such as sodium bicarbonate and sodium tetraborate; latex paint formulations contain a pigment or dye, e.g. a lithopone, titanium dioxide, barium sulphate, calcium carbonate, a clay, mica, talc, silica, benzylidene yellow, cadmium yellow, carbon black, a chromium oxide or hydroxide, ion oxide, Hansa yellow, a toluidine toner, sienna, umber, ultramarine blue, and may contain pigment dispersants and thickeners, e.g. tetrasodium pyrophosphate, lecithin, gum arabic, casein, a -protein, a water-soluble cellulose derivative. A latex of 35% solids containing a 50 : 50 styrene-butadiene copolymer, suitable for paint formulations, is prepared by agitating and heating a mixture of butadiene, styrene, water, soap flakes and potassium persulphate, incorporating potassium oleate, and removing the volatile substances by steam distillation, a typical paint being made from such latex by incorporating a water paste of sodium pyrophosphate, titanium dioxide, lithopone and mica, a -protein solution, pine oil and tributyl phosphate.  Specification 672,290 is referred to.