Method for the preparation of a fluorine-containing organopolysiloxane
First Claim
1. A method for the preparation of an organopolysiloxane compound having a 3-(perfluoroalkyl)propyl group represented by the general formula Rf--CH2 CH2 CH2 --, Rf being a perfluoroalkyl group having from 1 to 10 carbon atoms, bonded to a silicon atom of the organopolysiloxane which comprises the steps of:
- (a) blending an organohydrogenpolysiloxane having, in a molecule, at least one difunctional siloxane unit of the unit formula RSi(H)O, in which R is a monovalent hydrocarbon group free from aliphatic unsaturation having 1 to 10 carbon atoms, and a 3-substituted propene-1 compound represented by the general formula
space="preserve" listing-type="equation">Rf--CH.sub.2 --CH═
CH.sub.2, in which Rf has the same meaning as defined above, with admixture of a catalytic compound for the hydrosilation reaction to form a reaction mixture; and
(b) heating the reaction mixture.
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Abstract
A novel and very efficient method is disclosed for the introduction of perfluoroalkyl groups into an organopolysiloxane by utilizing the hydrosilation reaction with an organohydrogenpolysiloxane. Different from the conventional but inefficient hydrosilation reaction using a perfluoroalkyl-substituted ethylene as the olefin compound, the inventive method utilizes a propene-1 3-substituted by a perfluoroalkyl group compound as the olefin compound to react with an organohydrogenpolysiloxane by which a very high efficiency in the hydrosilation reaction can be obtained without side reactions which otherwise greatly decrease the yield of the desired perfluoroalkyl-containing organopolysiloxane product.
54 Citations
12 Claims
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1. A method for the preparation of an organopolysiloxane compound having a 3-(perfluoroalkyl)propyl group represented by the general formula Rf--CH2 CH2 CH2 --, Rf being a perfluoroalkyl group having from 1 to 10 carbon atoms, bonded to a silicon atom of the organopolysiloxane which comprises the steps of:
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(a) blending an organohydrogenpolysiloxane having, in a molecule, at least one difunctional siloxane unit of the unit formula RSi(H)O, in which R is a monovalent hydrocarbon group free from aliphatic unsaturation having 1 to 10 carbon atoms, and a 3-substituted propene-1 compound represented by the general formula
space="preserve" listing-type="equation">Rf--CH.sub.2 --CH═
CH.sub.2,in which Rf has the same meaning as defined above, with admixture of a catalytic compound for the hydrosilation reaction to form a reaction mixture; and (b) heating the reaction mixture. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An organopolysiloxane compound having a 3-(perfluoroalkyl)propyl group represented by the general formula Rf--CH2 CH2 CH2 --, Rf being a perfluoroalkyl group having from 1 to 10 carbon atoms, bonded to a silicon atom of the organopolysiloxane which is a product prepared by the process comprising the steps of:
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(a) blending an organohydrogenpolysiloxane having, in a molecule, at least one difunctional siloxane unit of the unit formula RSi(H)O, in which R is a monovalent hydrocarbon group free from aliphatic unsaturation having 1 to 10 carbon atoms, and a 3-substituted propene-1 compound represented by the general formula
space="preserve" listing-type="equation">Rf--CH.sub.2 --CH═
CH.sub.2,in which Rf has the same meaning as defined above, with admixture of a catalytic compound for the hydrosilation reaction to form a reaction mixture; and (b) heating the reaction mixture. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification