Polymerization of an organofunctional cocyclic siloxane
AssigneeDow Corning Corporation
InventorsDaniel Joseph Halloran, Brett Lee Zimmerman
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Abstract
An organofunctional cocyclic siloxane, i.e., a dialkyl, alkyl aminoalkyl cocyclic siloxane, is used to prepare copolymeric siloxane fluids, copolymeric siloxane gums, and terpolymeric siloxanes via three polymerization techniques. In one embodiment, the dialkyl, alkyl aminoalkyl cocyclic siloxane is polymerized using a bulk polymerization technique. In another embodiment, the dialkyl, alkyl aminoalkyl cocyclic siloxane is polymerized using an emulsion polymerization technique. In an additional embodiment, the dialkyl, alkyl aminoalkyl cocyclic siloxane is polymerized using a microemulsion polymerization technique. The dialkyl, alkyl aminoalkyl cocyclic siloxane most preferred is a dimethyl, methyl aminoalkyl cocyclic siloxane.
Claims4
A method of preparing a silicone terpolymer comprising heating a mixture of (i) an organofunctional cocyclic siloxane having the formula
- where R1 to R3 are each an alkyl group containing 1-6 carbon atoms;
- a and b are each a positive integer having a value of 1-10;
- and R4 is an aminoalkyl group having the formula
- where R′″ and R″″0 are each hydrogen or an alkyl group containing 1-4 carbon atoms, Rv is hydrogen or a group having the formula
- where c is a positive integer having a value of 2 or 3, and Rv′ and Rv″ are hydrogen or an alkyl group containing 1-4 carbon atoms;
- and (ii) an alkylmethyl, dimethyl silicone cocyclic containing eight or more carbon atoms, in the presence of (iii) an alkaline catalyst, at a temperature and for a time sufficient to cause polymerization of (i) and (ii) to the desired and silicone terpolymer.
Dependencies are inferred from the claim text.