Patent GB-1107295-A (GB)
Title: Silicone rubber articles
IPC: C08J7/046
Filed: 1966-03-10
Abstract: Compositions for coating silicone rubber articles consist essentially of (a) from 0.5 to 20 weight per cent of the composition consisting essentially of (1) from 25 to 90 weight per cent of a compound of the general formula RSi(OR1)3, and (2) from 10 to 75 weight per cent of a compound of a general formula Ti(OR1)4, or a partial hydrolysate of (1) and (2) above, where each R is a monovalent hydrocarbon radical, free from aliphatic unsaturation and containing not more than 18 carbon atoms or a 3,3,3-trifluoropropyl radical, and each R1 is an alkyl or alkoxyalkyl radical each containing not more than 8 carbon atoms; and (b) from 80 to 99.5 weight per cent of a volatile solvent. Numerous examples of suitable R and R1 and solvents are specified. In the examples compositions used are (a) a 10 weight per cent solutions of methyltrimethoxysilane and tetrabutyltitanate in diethylene glycol dimethyl ether, and a 15 weight per cent solution of CF3CH2CH2Si(OCH2CH2OCH3)3\t and Ti(OCH2CH2OCH3)4 in equal weights of xylene.ALSO:A process for treating a silicone rubber article comprises (1) coating the article with a composition consisting essentially of (a) from 0.5 to 20 weight per cent of a composition consisting essentially of (1) from 25-90 weight per cent of a compound of the general formula:-RSi (OR\sv)3 and (2) from 10-75 weight per cent of a compound of the general formula:-Ti (OR\sv)4 or a partial hydrosylate or (1) and (2), where each R is a monovalent hydrocarbon radical free from aliphatic unsaturation and containing not more than 18 carbon atoms or a 3, 3.3-trifluoropropyl radical, and each R\sv is an alkyl or alkoxy radical each containing not more than 8 carbon atoms and (b) from 80 to 99.5 weight per cent of a volatile solvent and (2) evaporating the solvent and a curing the titanate-silane coating. The silicone rubber may consist of dimethylpolysiloxane, with a silica filler.  That other siloxanes and fillers are given.  Many examples of radicals which may represent R and R\sv are listed. More than one silane or titanate may be used.  A list of suitable solvents is given.  The coating may be applied by dipping, spraying or painting.  Articles coated in this way are trachea tubes.  Thoracic drains, catheters, blood conduits for a heart-lung machines and artificial kidneys, and chin, nose, and other prosthetic inplants as well as slabs and sheets.ALSO:Trachea tubes, thoracic drains, catheters, blood conduits for heart-lung machines and artificial kidneys, and chin, nose, and other prosthetic implants made from silicone rubber are coated by a process which comprises (1) coating a silicone rubber article with a composition consisting essentially of (a) from 0.5 to 20 p  weight per cent of a composition consisting essentially of (1) from 25 to 90 weight per cent of a compound of a general formula RSi(OR1)3 and (2) from 10 to 75 weight per cent of a compound of a general formula Ti(OR1)4, or a partial hydrolysate of (1) and (2) above, where each R is a mono-valent hydrocarbon radical, free from aliphatic unsaturation and containing not more than 18 carbon atoms or a 3, 3,3-trifluoropropyl radical, and each R1 is an alkyl or alkoxyalkyl radical each containing not more than 8 carbon atoms and (b) from 80 to 99.5 weight per cent of volatile solvent, and (2) evaporating the solvent and curing the titanate-silane coating whereby a tack-free silicone rubber article is obtained.