METHOD FOR PRODUCING LATEX CONDOMS Russian patent published in 1998 - IPC

FIELD: production of latex articles by dipping technique; may be used for production condoms from latex. SUBSTANCE: pre-cleaned condom-shaping moulds are twice dipped into latex mixture, followed by drying resulting film after each dipping procedure. Films are subjected to vulcanization, left to swell in solution, coated with wet powder, washed and dried. Novelty of the method is in that each time moulds are dipped into latex mixture at 33 ± 3 C for 40 ± 4 s, followed by drying film after each dipping procedure. Drying after first dipping is conducted at 110 ± 15 C for 80 ± 8 s, while drying after second dipping is effected at 90 ± 15 C for 35 ± 4 s. Film swelling treatment is effected at temperature 80 ± 10 C for 40 ± 4 s in aqueous solution containing 2.85-2.90% of sodium tripolyphosphate, 0.23-0.25% of sodium hydroxide and 0.46-0.50% of Volgonate emulsifier. Washing is conducted for at least 30 min in aqueous solution containing 4.1-4.2% of texturized starch, 4.88-5.0% of mixture consisting of calcium carbonate + calcium stearate + aluminium stearate, 0.17-0.19% of polymethylsiloxanic liquid and 0.013-0.015% of boric acid. Latex mixture has the following composition, parts by weight: sulphur, 1.8; zinc while paint, 0.77; basic zinc carbonate, 0.33; zinc ethylphenyl dithiocarbamate, 0.65; ethylcymate, 0.55; antioxidant agent, 1.0; dispersing agent, 0.61; potassium oxide hydrate, 0.47; aqua ammonia, 0.47-1.21; and pigmentary paste, 0.03-0.07 per 100 wt.pts of dry latex matter. Treatment of coating with wet powder is effected by dipping into 3.5-3.6-% texturized starch slurry. EFFECT: higher quality of consumer goods.