1,053,144. Synthetic resin coating compositions; bacterial polysaccharides. TENNECO CHEMICALS Inc. April 15, 1964 [May 14, 1963], No. 15694/64. Headings C3P and C3U. Coating compositions comprise an aqueous dispersion containing 10 to 60% by weight of a water-insoluble linear addition polymer, obtained by polymerization of monoethylenically unsaturated molecules, and approximately 0À01 to 2% by weight of the composition of a thickener that is a high molecular weight polysaccharide produced by the fermentation of a carbohydrate by an organism selected from the group consisting of bacteria of the genus Xanthomonas, bacteria of the genus Arthrobacter and yeasts of the genus Cryptococcus. Specified polymers are polyvinyl acetate, polyvinyl chloride, polystyrene, polyethylene, polyisobutylene, polyvinyl butyrate, and copolymers of vinyl acetate and vinyl chloride, vinyl acetate and acrylonitrile, vinyl chloride and acrylonitrile, vinyl chloride and vinylidene chloride, styrene and butadiene, acrylonitrile and butadiene, acrylic or methacrylic esters with vinyl acetate, vinyl chloride, acrylonitrile or styrene, acrylic esters, methacrylic esters and acrylic acid, and styrene and maleic anhydride. The polysaccharides may be produced by fermentation of fructose, sucrose, maltose, lactose, galactose and particularly glucose by the strains designated in the Northern Regional Laboratory Classification Xanthomonas campestris (NRRL B-1459), Arthrobacter sp. (NRRL B-1973) and Cryptococcas laurenti var. flavesceus (NRRL Y-1401). Fermentation may be effected for 4 to 5 days at 25‹ to 28‹ C. under aerobic conditions in a medium containing 2 to 6% of glucose, organic nitrogen sources, dibasic potassium phosphate and trace elements. The reaction mixture is centrifuged and the polysaccharides precipitated with methanol in the presence of potassium chloride. The polysaccharides may be modified by heating at 90‹ C. in the presence of a small proportion of potassium chloride, or deacetylated by treatment with dilute alkali. The polysaccharides produced are said to have the following approximate constitutions:-(NRRL B-1459) D-mannose, D-glucose, D-glucuronic acid (as potassium salt) and acetyl in molar ratio 2: 1: 1: 1; (NRRL B-1973) D-galactose, D-glucose, mannuronic acid (as potassium salt) and acetyl in molar ratio 0À75:0À75: 1: 1; and (NRRL Y-1401) D- mannose, D-xylose, D-glucuronic acid (as potassium salt) and acetyl in molar ratio 4:1:1:1-5. The coating compositions may also contain emulsifying and dispersing agents, plasticizers, dyes, pigments, extenders, defoaming agents, bactericides, fungicides, perfumes and masking agents, alkyd resins, drying oils, natural resins and corrosion inhibitors. Examples describe emulsion paints comprising the ammonium salt of a copolymer of ethyl acrylate, methyl methacrylate and acrylic acid, t.-octylphenoxypolyethoxyethanol, a sodium salt of a polymeric carboxylic acid, polyacrylic acid, phenylmercuric acetate, a defoaming agent, talc, titanium dioxide, calcium carbonate, ammonia and polysaccharides obtained by the fermentation of glucose with (1) B-1459, (2) B-1973 and (3) Y-1401; and emulsion paints comprising polyvinyl acetate, diethylene glycol diethyl ether, potassium pyrophosphate, titanium dioxide, calcium metasilicate and polysaccharides obtained by the fermentation of glucose with (4 and 7) B-1459, (5 and 8) B-1973 and (6 and 9) Y-1401.