GB766627A - Synthetic resinous compositions - Google Patents

Abstract

A resinous composition for coating fine wires consists essentially of (a) 40 to 99 per cent (by weight) of the reaction product of (1) 5 to 60 per cent (by weight) of an organosilicon compound of the general formula <FORM:0766627/IV(a)/1> , where each R is a monovalent hydrocarbon or halogenated hydrocarbon radical, each X is a halogen atom, alkoxy radical or hydroxy radical, n has an average value of from 1 to 2 and m has an average value of from 0.05 to 3; (2) 10 to 30 per cent by weight of a tri- or tetra-hydroxy alcohol; and (3) 30 to 70 per cent of a dicaboxylic acid, anhydride or lower alkyl ester; and (b) 1 to 60 per cent by weight of a polyvinyl acetal resin. If desired, up to 50 per cent by weight of (1) the organosilicon compound may be replaced with drying oils and/or drying oil acids, e.g. linseed, sardine, soyabean, dehydrated castor, tung, oiticica, perilla, chinawood, hempseed, poppyseed, safflower, sunflower-seed and walnut oils and the corresponding acids, (2) the polyhydric alcohol may be replaced by dihydric alcohols, e.g. ethylene and neopentyl glycols, and (3) the acetal resin may be replaced by a phenol-aldehyde resin obtained, e.g., from formaldehyde, acetaldehyde, benzaldehyde, cinnamic aldehyde or propionaldehyde and phenol, cresols, xylenols, wood oil phenols or petra-alkyl phenols. Essential components specified are:-organosilicon compounds-dimethyldichloro-, dibutyldiisopropoxy-, phenylmethyldiethoxy-, divinyldibutoxy-, tolyltriethoxy-, cyclohexyltrimethoxy-, phenylmethyldibromo-, (trifluoromethylphenyl) methyldichloro-, chlorophenyltriethoxy-,bromoxenyltrichloro-, stearylmethyldiethoxy- and allylstearyloxydimethoxy-silanes, mixtures and partial and/or complete hydrolysates thereof, diphenyl-, phenylmethyl-, dimethyl-, chlorophenylmethyl- and octadecylmethyl-silanediols and mixtures thereof; polyhydric alcohols-glycerine, pentaerythritol, trimethylol ethane and trimethylol propane; dicarboxylic acids-malonic, adipic, sebacic, maleic, dimethylmaleic, cyclohexyldicarboxylic, methylene disalicylic, phthalic, terephthalic, isophthalic, naphthalic, stilbenedicarboxylic, diphenic, tolane dicarboxylic and dibenzyl dicarboxylic acids; polyvinyl acetal resins-the condensation products of a polyvinyl ester, e.g. polyvinyl acetate, propionate or butyrate, and/or polyvinyl alcohol with an aldehyde, e.g. formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde and benzaldehyde. Examples are given. Specifications 691,013, 691,014, 691,015 and 715,231 are referred to.