Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2001-05-29
2003-07-15
Metzmaier, Daniel S. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C528S015000, C528S025000, C516S076000
Reexamination Certificate
active
06593422
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
REFERENCE TO A MICROFICHE APPENDIX
Not applicable.
FIELD OF THE INVENTION
This invention is related to emulsions and preparing emulsions using non-crosslinked silicone polyethers and crosslinked silicone polyethers. In a first embodiment, emulsions containing non-crosslinked silicone polyethers and crosslinked silicone polyethers are prepared by emulsion polymerization. In a second embodiment, emulsions containing non-crosslinked silicone polyethers and crosslinked silicone elastomers containing no oxyalkylene units are prepared mechanically.
BACKGROUND OF THE INVENTION
While U.S. Pat. No. 5,387,417 (Feb. 7, 1995) suggests using certain non-crosslinked silicone polyethers in combination with certain crosslinked silicone polyethers for preparing emulsions, the '417 patent does not teach preparing emulsions using emulsion polymerization, a first embodiment of the present invention.
In addition, where emulsions in the '417 patent are prepared mechanically, the '417 patent does not teach preparing mechanical emulsions with a non-crosslinked silicone polyether in combination with a crosslinked silicone elastomer containing no oxyalkylene units, a second embodiment of the invention. Further, and in this regard, the '417 patent does not teach preparing emulsions with a non-crosslinked silicone polyether in combination with a crosslinked silicone elastomer containing no oxyalkylene units, without application of any mechanical shearing force.
BRIEF SUMMARY OF THE INVENTION
In a first embodiment, the invention is directed to a method of preparing emulsions by heating and polymerizing a mixture containing (i) a non-crosslinked silicone polyether; (ii) optionally, a cosurfactant which can be a monohydroxy alcohol, diol, triol, or glycol ether; (iii) an ≡Si—H containing polysiloxane; (iv) a mono-alkenyl polyether; (v) an &agr;,&ohgr;-diene, &agr;,&ohgr;-diyne, or &agr;,&ohgr;-ene-yne; (vi) optionally, a silicone oil such as (a) a low molecular weight linear or cyclic volatile methyl siloxane, or (b) a low molecular weight linear or cyclic volatile or non-volatile alkyl or aryl siloxane; (vii) a platinum catalyst; and (viii) water.
The crosslinked silicone polyether is obtained as a result of polymerization of components (iii), (iv), and (v).
In a second embodiment, the invention is directed to a method of making oil-in-water emulsions by mixing (i) a non-crosslinked silicone polyether; (ii) a cosurfactant such as a monohydroxy alcohol, diol, triol, or glycol ether; and (iii) water; with (iv) a crosslinked silicone elastomer containing no oxyalkylene units prepared by reacting (a) an ≡Si—H containing polysiloxane; (b) an &agr;,&ohgr;-diene, &agr;,&ohgr;-diyne, or &agr;,&ohgr;-ene-yne; (c) a silicone oil such as (I) a low molecular weight linear or cyclic volatile methyl siloxanes, or (II) a low molecular weight linear or cyclic volatile or non-volatile alkyl or aryl siloxane; and (d) a platinum catalyst.
The invention is also directed to emulsions prepared according to the methods of each of these embodiments.
These and other features of the invention will become apparent from a consideration of the detailed description.
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DeCesare Jim L.
Dow Corning Corporation
Metzmaier Daniel S.
LandOfFree
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