Organopolysiloxanes

Abstract

Abstract Organosilicon compounds of the average general formula <FORM:0802467/III/1> in which each R is a monovalent hydrocarbon radical, R1 is an alkylene radical, each R11 is an alkylene radical containing at least 2 carbon atoms, n has a value of at least 1. R111 is hydrogen, a saturated hydrocarbon or acyl hydrocarbon radical and a has a value from 0 to 3 inclusive (see Group IV (a)), are used as anti-foaming agents. The products of Examples (1) and (2) are good anti-foam agents for ethylene glycol anti-freeze solutions.ALSO:Organosilicon compounds of the average general formula <FORM:0802467/IV (a)/1> in which each R is a monovalent hydrocarbon radical, R1 is an alkylene radical, each R11 is an alkylene radical containing at least 2 carbon atoms, n has a value of at least 1, R111 is hydrogen, a saturated hydrocarbon radical or an aryl hydrocarbon radical, and a has a value from 0 to 3 inclusive, may be made (i) by reacting an unsaturated ether of the general formula R111(OR11)nOB, in which B is an alkenyl radical, with an organosilane or siloxane containing an Si-H group, preferably in the presence of catalysts such as organic peroxides, platinum or chloroplatinic acid. Where R111 is hydrogen it is preferable to block the OH group in the unsaturated ether with a triorganosiloxy group prior to reaction with the silane or siloxane; or (ii) by reacting a hydroxyalkyl silane or siloxane with an alkylene oxide at 70 DEG to 150 DEG C. in the presence of catalysts such as H2SO4, SnCl4 and AlCl3. The R radicals specified are alkyl, cycloaliphatic, aryl, aralkyl or unsaturated aliphatic. The novel siloxanes may be copolymerized with conventional siloxanes containing silicon-bonded hydrocarbon or halogenated hydrocarbon radicals. In typical examples: (1) polyglycol A was reacted with trimethylchlorosilane and the resulting trimethylsiloxy-blocked product was then reacted with a trimethyl end-blocked methylhydrogensiloxane in the presence of chloroplatinic acid. The product was then hydrolysed to remove the trimethylsiloxy groups from the glycol side chain and purified to yield a water-soluble liquid of the formula <FORM:0802467/IV (a)/2> (5) the vinyl ether of ethylene glycol was reacted with tetramethyldisiloxane in toluene and in the presence of chloroplatinic acid to give the compound <FORM:0802467/IV (a)/3> Uses.-The products are useful as emulsifying agents, e.g. for phenylmethylsiloxanes, anti-foaming agents, mould-release agents, lubricants and as cosmetic additives.

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