JPS6319533B

Organopolysiloxanes having the formulas AxR3-xSiO(SiR2-xAxO)nSiR3-xAx or (SiR2-xAxO)y, where R is a monovalent hydrocarbon radical or a halogenated monovalent hydrocarbon radical or a monovalent aliphatic radical consisting of carbon, hydrogen, ether oxygen and fluorine atoms; A is a SiC-bonded organic radical containing a carboxyl group and a carbonyl group to which is bonded an organic radical having at least one terminal carbon-carbon double bond; n is an integer having a value of at least 1; x is 0 or 1; and y is an integer having a value of from 3 to 10, in which the organopolysiloxanes contain at least one radical represented by A per molecule. These organopolysiloxanes are preferably prepared by reacting organopolysiloxanes having the above formulas, in which the radical A is hydrogen, with, for example, allylsuccinic anhydride, and thereafter reacting the resultant organopolysiloxanes, which contain carboxylic acid anhydride groups, with, for example, a hydroxyethyl acrylate. The organopolysiloxanes can be crosslinked, for example, by ultraviolet light, and may be used in the preparation of coatings or for embedding electronic components.