摘要:
Linear or straight-chain trimethylsiloxy endcapped methylhydrogen polysiloxanes are made by contacting hexamethyldisiloxane with a highly pure methylhydrogen cyclic siloxane, in the presence of anhydrous trifluoromethane sulfonic acid catalyst at room temperature. Trimethylsiloxy endcapped alkylmethyl siloxanes are made by reacting the linear or straight-chain trimethylsiloxy endcapped methylhydrogen polysiloxanes with an alpha-olefin, in the presence of a platinum catalyst. Alkylmethyl cyclic siloxanes containing zero parts per million residual .ident.SiH, are made by reacting anhydrous alpha-olefins and a highly pure methylhydrogen cyclic siloxane, in the presence of dried platinum supported on carbon catalyst.
摘要:
Linear or straight-chain trimethylsiloxy endcapped methylhydrogen polysiloxanes are made by contacting hexamethyldisiloxane with a highly pure methylhydrogen cyclic siloxane, in the presence of anhydrous trifluoromethane sulfonic acid catalyst at room temperature. Trimethylsiloxy endcapped alkylmethyl siloxanes are made by reacting the linear or straight-chain trimethylsiloxy endcapped methylhydrogen polysiloxanes with an alpha-olefin, in the presence of a platinum catalyst. Alkylmethyl cyclic siloxanes containing zero parts per million residual .tbd.SiH, are made by reacting anhydrous alpha-olefins and a highly pure methylhydrogen cyclic siloxane, in the presence of dried platinum supported on carbon catalyst.
摘要:
Linear or straight-chain trimethylsiloxy endcapped methylhydrogen polysiloxanes are made by contacting hexamethyldisiloxane with a highly pure methylhydrogen cyclic siloxane, in the presence of anhydrous trifluoromethane sulfonic acid catalyst at room temperature. Trimethylsiloxy endcapped alkylmethyl siloxanes are made by reacting the linear or straight-chain trimethylsiloxy endcapped methylhydrogen polysiloxanes with an alpha-olefin, in the presence of a platinum catalyst. Alkylmethyl cyclic siloxanes containing zero parts per million residual .tbd.SiH, are made by reacting anhydrous alpha-olefins and a highly pure methylhydrogen cyclic siloxane, in the presence of dried platinum supported on carbon catalyst.
摘要:
The present invention provides near quantitative yields of greater than about 95% isomeric purity of poly(3-aminopropylmethylsiloxane)-poly(dimethylsiloxane) copolymers of the general formulae: Me3Si(H2NCH2CH2CH2MeSiO)w(Me2SiO)xOSiMe3 (H2NCH2CH2CH2MeSiO)y(Me2SiO)z wherein Me is methyl, w may range from 1 to about 100, x may range from 1 to about 100, y may range from 1 to about 6, z may range from 1 to about 6 and y+z may range from 3 to about 7. The present invention also provides a simple method for rapidly producing poly(3-aminopropylmethylsiloxane)-poly(dimethylsiloxane) copolymers of the general formulae: Me3Si(H2NCH2CH2CH2MeSiO)w(Me2SiO)xOSiMe3 (H2NCH2CH2CH2MeSiO)y(Me2SiO)z wherein Me is methyl, w may range from 1 to about 100, x may range from 1 to about 100, y may range from 1 to about 6, z may range from 1 to about 6, and y+z may range from 3 to about 7, the method comprising heating of poly(3-aminopropylmethylsiloxane) of at least 95% isomeric purity, a cyclodimethylsiloxane with a basic catalyst, and destroying the catalyst when the copolymerization reaction is complete.
摘要:
The present invention provides near quantitative yields of greater than about 95% isomeric purity of poly(3-aminopropylmethylsiloxanes) of the general formulae: Me3Si(H2NCH2CH2CH2MeSiO)xOSiMe3 (H2NCH2CH2CH2MeSiO)y wherein Me is methyl, x may range from 2 to about 100 and y may range from 3 to about 7. The present invention also provides a simple method for rapidly producing poly(3-aminopropylmethylsiloxanes) of the general formulae: Me3Si(H2NCH2CH2CH2MeSiO)xOSiMe3 (H2NCH2CH2CH2MeSiO)y wherein Me is methyl, x may range from 2 to over 100 and y may range from 3 to about 7, the method comprising heating of 3-(3-aminopropyl)-1,1,1,3,5,5,5-heptamethyltrisiloxane, of at least 95% isomeric purity, with a basic catalyst, removing hexamethyldisiloxane, and decomposing the catalyst.
摘要:
The crosslinking and simultaneous alkylation of poly(hydridomethylsiloxanes) form crosslinked siloxanes having n-alkylmethyl groups. Without changing the chain length of the poly(hydridomethylsiloxane) starting material, a family of lightly crosslinked siloxanes having n-alkylmethyl groups, with a range of viscosities, can be produced using one or more alpha-olefins along with a small amount of an unconjugated alpha, omega-diene added as a crosslinker. The poly(hydridomethyl siloxanes) are made from highly pure silanol-free hexamethyldisiloxane and highly pure mixtures of silanol-free tetramethylcyclotetrasiloxane (D.sup.H 4) and pentamethylcyclopentasiloxane D.sup.H 5 containing no more than about 100 parts per million (ppm) water, with anhydrous trifluoromethane sulfonic acid (triflic acid, CF.sub.3 SO.sub.3 H), at room temperature, to provide linear poly(hydridomethylsiloxanes) having degrees of polymerization of up to about 250.
摘要翻译:聚(羟甲基硅氧烷)的交联和同时烷基化形成具有正烷基甲基的交联硅氧烷。 在不改变聚(羟基甲基硅氧烷)起始材料的链长度的情况下,可以使用一种或多种α-烯烃以及少量未共轭的α-烯烃制备具有一定粘度范围的具有正烷基甲基的轻度交联的硅氧烷族 α,ω-二烯作为交联剂加入。 聚(氢化甲基硅氧烷)由高纯度无硅烷醇六甲基二硅氧烷和不含硅烷醇的四甲基环四硅氧烷(DH4)和含有不超过约100ppm(ppm)水的五甲基环五硅氧烷DH5与无水三氟甲磺酸( 三氟甲磺酸,CF 3 SO 3 H),以提供具有高达约250的聚合度的线性聚(羟甲基硅氧烷)。