Organopentasiloxane and method for its preparation
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorTadashi Okawa
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Abstract
An organopentasiloxane having the formula A--R.sup.1 --SiMe.sub.2 (OSiMe.sub.2).sub.3 OSiR.sup.2 .sub.(3-n) (OR.sup.2).sub.n wherein Me denotes a methyl radical; A is a group selected from the group consisting of methacryloxy, glycidoxy and amino; R.sup.1 is a divalent organic group selected from the group consisting of an alkylene group having at least 2 carbon atoms and an alkyleneoxyalkylene group; R.sup.2 is independently selected from monovalent hydrocarbon groups free of aliphatically unsaturated bonds; and n is an integer having a value of 1 to 3, and methods for the preparation thereof, are disclosed.
Claims16
An organopentasiloxane having the formula
- A--R.sup.1 --SiMe.sub.2 (OSiMe.sub.2).sub.3 OSiR.sup.2.sub.(3-n) (OR.sup.2).sub.n
- wherein Me denotes a methyl radical;
- A is selected from the group consisting of methacryloxy, glycidoxy and amino radicals;
- R.sup.1 is a divalent organic group selected from the group consisting of an alkylene group having at least 2 carbon atoms and an alkyleneoxyalkylene group;
- R.sup.2 is independently selected from monovalent hydrocarbon groups free of aliphatically unsaturated bonds;
- and n is an integer having a value of 1 to 3.
A method for the preparation of an organopentasiloxane having the formula A'--R.sup.1 --SiMe.sub.2 (OSiMe.sub.2).sub.3 OSiR.sup.2.sub.(3-n) (OR.sup.2).sub.n, wherein Me denotes a methyl radical;
- A' is selected from the group consisting of methacryloxy and glycidoxy radicals;
- R.sup.1 is a divalent organic group selected from the group consisting of an alkylene group having at least 2 carbon atoms and an alkyleneoxyalkylene group;
- R.sup.2 is independently selected from monovalent hydrocarbon groups free of aliphatically unsaturated bonds;
- and n is an integer having a value of 1 to 3, which is characterized by an addition reaction, in the presence of a platinum-type catalyst, between an organopentasiloxane having the formula H--SiMe.sub.2 (OSiMe.sub.2).sub.3 OSiR.sup.2.sub.(3-n) (OR.sup.2).sub.n, wherein R.sup.2 and n have their previously defined meanings, and a functional alkene selected from the group consisting of methacryloxy-containing alkene, glycidoxy-containing alkene, methacryloxy-containing alkyleneoxyalkene and glycidoxy-containing alkyleneoxyalkene.
A method for the preparation of an organopentasiloxane having the formula A"--R.sup.1 --SiMe.sub.2 (OSiMe.sub.2).sub.3 OSiR.sup.2.sub.(3-n) (OR.sup.2).sub.n, wherein Me denotes a methyl radical;
- A" is an amino group;
- R.sup.1 is a divalent organic group selected from the group consisting of an alkylene group having at least 2 carbon atoms and an alkyleneoxyalkylene group;
- R.sup.2 is independently selected from monovalent hydrocarbon groups free of aliphatically unsaturated bonds;
- and n is an integer having a value of 1 to 3, which is characterized by an addition reaction, in the presence of a platinum-type catalyst, between an organopentasiloxane having the formula H--SiMe.sub.2 (OSiMe.sub.2).sub.3 OSiR.sup.2.sub.(3-n) (OR.sup.2).sub.n, wherein R.sup.2 and n have their previously defined meanings, and an alkene selected from the group consisting of triorganosilylamino-containing alkene and triorganosilylamino-containing alkyleneoxyalkene and thereafter subjecting the reaction product therefrom to a desilylation reaction.
Dependencies are inferred from the claim text.