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Crosslinkable organopolysiloxanes and a method for preparing the crosslinkable organopolysiloxanes
| Details |
Inventors: Muller, Johann; Trieschmann, Christa; Preiner, Gerhard;
Assignee: Wacker-Chemie GmbH (Munich, DE)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
Organopolysiloxanes having the formulas A.sub.x R.sub.3-x SiO(SiR.sub.2-x A.sub.x O).sub.n SiR.sub.3-x A.sub.x or (SiR.sub.2-x A.sub.x O).sub.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. |
|
DETAILED DESCRIPTION What is claimed is: 1.
Crosslinkable organopolysiloxanes having the formula selected from the group consisting of A.
sub.
x R.
sub.
3-x SiO(SiR.
sub.
2-x A.
sub.
x O).
sub.
n SiR.
sub.
3-x A.
sub.
x and (SiR.
sub.
2-x A.
sub.
x O).
sub.
y, where R is selected from the group consisting of a monovalent hydrocarbon radical, a halogenated monovalent hydrocarbon radical and a monovalent aliphatic radical containing carbon, hydrogen, ether oxygen and fluorine atoms; A represents 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 A per molecule.
2.
The organopolysiloxane of claim 1, wherein the radical A is selected from the formula consisting of ##STR7## where R.
sup.
1 is a divalent radical selected from the group consisting of a hydrocarbon radical and a halogenated hydrocarbon radical; R.
sup.
2 is selected from the group consisting of hydrogen and a monovalent hydrocarbon radical which is free of aliphatic carbon-carbon multiple bonds and has from 1 to 10 carbon atoms per radical; R.
sup.
3 is a hydrocarbon radical which is divalent when a is 1, trivalent when a is 2 and tetravalent when a is 3; X is selected from the group consisting of oxygen, sulfur and a radical having the formula --NR.
sup.
2 --, R.
sup.
2 is the same as above and Y is selected from the formula consisting of ##STR8## R.
sup.
1 and R.
sup.
2 are the same as above; a is 1, 2 or 3 and m is an integer having a value of from 1 to 6 and x is 0 or 1.
3.
The organopolysiloxane of claim 1, wherein A is a radical selected from the group consisting of ##STR9## 4.
A method for preparing the crosslinkable organopolysiloxanes of claim 1, which comprises reacting in a first stage, an organopolysiloxane selected from the group consisting of H.
sub.
x R.
sub.
3-x SiO(SiR
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