Solventless process for making polysiloxane polymers
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United States of America Patent
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Jul 10, 2001
Grant Date -
N/A
app pub date -
Nov 16, 1999
filing date -
Dec 3, 1998
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Expired
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Abstract
This invention is a solventless process for anionically polymerizing polysiloxane polymers. No volatile hydrocarbon solvent is used. A cyclic siloxane monomer and any comonomer are introduced into a molten polymer phase of a low molecular weight polymer that has a melting point within the polymerization temperature range for the cyclic siloxanes and the comonomer, for example, 30 to 80.degree. C. which is the melting point range for polyethylene wax which is preferred. A non-volatile hydrocarbon oil with a melting point in this range may also be used, especially if a final polymer containing oil is desired. The cyclic siloxane monomer is anionically polymerized in the molten polymer phase or the oil at 30 to 150.degree. C. Ethylene and styrene are preferred comonomers. The low molecular polymer or non-volatile oil is not separated from the polysiloxane after termination of the polymerization.
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