Patent GB-624362-A (GB)
Title: Improvements in or relating to organo-silicon compounds
IPC: C04B26/32
Filed: 1946-03-08
Abstract: A resinous composition is prepared by hydrolysing a mixture of an allyl silicon compound of the general formula (C3H5)xSiY(4-x), wherein x is from 1 to 3, Y is a halide or ethoxy radical and one or more compounds of the general formula R2SiY(4-z), wherein R is a saturated alkyl or an aryl radical, Y is a halide or ethoxyl radical and z is from 1 to 3, dehydrating and partially condensing the silicols to form a hydrocarbon soluble mass which is dissolved in a hydrocarbon.  A resinous compound is obtained by hydrolysing a mixture of an allyl-silicon ethoxide and an ethoxide of the general formula R2Si(OC2H5)4-z, where R and z have the above significance, and dehydrating and condensing the silicol mixture to form a silicone interpolymer.  A resinous composition is obtained by hydrolysing, dehydrating and partially condensing an allyl silicon compound of the general formula (C3H5)xSiY4-x, where x and Y have the above significance, and mixing the resulting allyl silicone with a similar product obtained by hydrolysing, dehydrating and partially condensing one or more silicon compounds of the formula RzSiY4-z, wherein R, Y and z have the above significance, and thereafter condensing the mixture to form an interpolymer. Polymerization through the unsaturated allyl group may also take place.  The silicone interpolymers may be dispersed or emulsified in a volatile liquid carrier such as water with the aid of ammonia and a dispersing agent such as diglycol stearate or a sodium alkyl sulphonate ester, hydrolysed polyvinyl esters and an alcohol such as ethyl alcohol may also be present.  Finely-divided inorganic materials such as silica flour, bentonite, glass powders, calcium fluoride, ceramic powders, graphite, anthracite and coal or petroleum coke may be added to the allyl silicone compositions. In examples: (1) a mixture of methyl silicon triethoxide, dimethyl silicon diethoxide and allyl silicon triethoxide is hydrolysed and the resulting interpolymer dissolved in toluene; (2), (3) a polymer is obtained by hydrolysing a mixture of dimethyl silicon diethoxide and allyl silicon triethoxide and may be further polymerized by heating in the presence of benzoyl peroxide or tertiary-butyl perbenzoate; (4) diallyl silicon di-ethoxide and dimethyl silicon diethoxide are hydrolysed to yield an interpolymer. Specifications 624,361 and 624,363 are referred to.  The Specification as open to inspection under Sect. 91 refers to the direct polymerisation of allyl silicon ethoxides and allyl silicon chlorides through the unsaturated group, e.g. allyl silicon triethoxide, diallyl silicon diethoxide and allylmethyl silicon diethoxide may be polymerized with the aid of organic or inorganic peroxides such as benzoyl peroxide, inorganic acids or inorganic halides.  The polymerization may be carried out in the presence of allyl phthalate or carbonate.  The preparation of polymers by hydrolysing allyl silicon compounds of the general formula (C3H5)xSiY(4 - x), wherein x is from 1 to and Y is an ethoxy radical or chlorine, and dehydrating and condensing the resulting silicone is also referred to. Suitable dehydrating agents mentioned are boric acid esters such as methyl borate, metal halides, the oxides and halides of phosphorus and sulphuric or hydrochloric acids.  The dehydration and condensation may be continued only until a solvent soluble allyl silicone is obtained.  This subject-matter does not appear in the Specification as accepted.ALSO:Allyl silicon compounds of the general formula (CH2=CH-CH2)xSiY(4-x), wherein Y is a halide or an ethoxy radical, and x is from 1 to 3 are prepared by reacting a Grignard reagent and a silicon tetrohalide or ethyl orthosilicate. The preparation of allyl silicon triethoxide, diallyl silicon diethoxide and triallyl silicon ethoxide is described.  The corresponding chlorides are prepared by a similar method.  The products may be hydrolysed to the corresponding silicols and then condensed to the corresponding silicone.  The hydrolysis may be carried out in the presence of an organo silicon compound of the general formula RxSiY4-x, wherein R is a saturated alkyl or an aryl radical, x is from 1 to 3 and Y is a halide or an ethoxide group, to yield a mixture of silicols which may then be dehydrated and condensed to yield a silicone interpolymer.  Specifications 624,361 and 624,363 are referred to.ALSO:Plastic compositions comprise mica flakes or inorganic fibrous material such as asbestos cloth or glass fibres bound together with an allyl silicone interpolymer as obtained by hydrolysing, dehydrating and condensing a mixture of an allyl silicon compound having the formula (C3 H5)x Si Y 4-x, wherein x is from 1 to 3 and Y is a halide or an ethoxyl radical, and one or more compounds of the general formula Rz Si Y4-z wherein R is a saturated alkyl radical or an aryl radical, Y is a halide or ethoxyl radical and Z is from 1 to 3.  Specifications 624,361 and 624,363 are referred to.  The Specification as open to inspection under Sect. 91 refers to the use of allyl-silicones themselves in the above plastic compositions.  This subject-matter does not appear in the Specification as accepted.