RELEASE COATING (VERSIONS) Russian patent published in 1998 - IPC

FIELD: antitack means. SUBSTANCE: invention is concerned with release coatings to prevent tacking foods to working members of process equipment and also with release coatings serving as separation means when compressing composites. To prolong service time and eliminate toxic components from hardened coatings, two versions of coatings are provided. In both of them, coating comprises primer and covering layers based on organosilicon compounds. According to the first version, composition of primer layer contains 0.85-1.90 wt parts of methyl(triacetoxy)silane, 0.05- 0.30 wt parts of dimethyl(diacetoxy)silane, and 98-99 wt parts of solvent: water, ethanol-water mixtures, or organic solvent. Covering layer is composed of 5-10 wt parts of polyorganosiloxane or its mixture with polymethylmetallosiloxane and 90-95 wt parts of organic solvent. According to the second version, composition of primer layer is the same, and covering layer consists of two sublayers, the first one containing 8-10 wt parts of polyorganosiloxane and 90-95 wt parts of organic solvent and the second one 5-10 wt parts of polymethylmetallosiloxane or its mixture with polyorganosiloxane and 90-95 wt parts of organic solvent. EFFECT: increased lifetime and eliminated toxicity. 4 cl, 1 tbl, 14 ex