Improvements in or relating to organosilicon compounds

摘要

Organosilicon alcohols containing the group ­SiMOH and their condensation products with silanols, i.e. containing the group ­SiMOSi­, where M is a divalent hydrocarbon group the terminal carbon atoms of which are separated by at least 1 additional carbon atom, are prepared by hydrolysing in an aqueous solution the sulphate ester groups of a compound of the formula: where R is alkyl, aryl, alkaryl, aralkyl or hydrogen; X is halogen, OR or a sulphate radical; B is hydrogen, NR4 or the equivalent of a metal; and a1 and b1=0 to 3, c1=0 to 1.5, d1=0 to 3, c1+d1=0.01 to 3 and a1+b1+2c1+d1=2 to 4. These starting materials are disclosed in Specification 942,812. Among the products are the new compounds: (HO)3Si[(CH2)3OH] and (HO)2Si(CH3)[(CH2)3OH]. The hydrolysis is preferably effected at pH less than 2 or above 12, and at raised temperature, e.g. boiling point. The acids may be removed by conventional methods leaving aqueous solutions of the silanols in equilibrium with water-soluble siloxanols. Concentration of these solutions yields oily or resinous polysiloxanes. In the Examples: (1), (2) and (3), gamma-acetoxypropylmethyldichlorosilane is reacted with chlorosulphonic acid and the product is dissolved in water and boiled. Apart from the compound gamma-hydroxypropylmethylsilanediol, various resinous products are obtained, e.g. [HO(CH2)3 Si(Me)O]n: (4) gamma-hydroxypropylsilane triol and its condensation products are obtained in solution by hydrolysis of [-Si(Cl2)(CH2)3 OSO3-]n; concentration of the solution yields the resin [-(HO)Si((CH2)3OH)O]n; (5) the siloxane is hydrolysed in water to give a precipitate of the formula: (6) delta-hydroxybutylmethylsilanediol is prepared; (8) a resin is prepared containing the units -Me2SiO- and Uses: impregnating paper, textiles and leather; emulsifying silicone oils.ALSO:Organosilicon compounds which are suitable for the impregnation of paper, textiles, leather and other materials comprise alcohols containing the group ­ SiMOH and their condensation products, i.e. siloxanes and siloxanols, where M is a divalent hydrocarbon group the terminal carbon atoms of which are separated by at least 1 additional carbon atom. Among the compounds specified are gamma-hydroxypropylmethylsilane diol and gamma-hydroxypropylsilane triol and their condensation products. Specification 942,812 is referred to.