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US 12,479,867 B2Granted
Processes for synthesizing unsymmetrical disiloxanes
AssigneeDow Silicones Corporation
InventorsXiaoyuan Zhou, Zhanjie Li, Eric Joffre
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Abstract
Described herein are methods for making alkenyl disiloxanes, comprising combining an alkenyl halosilane with an alkyl halosilane and adding the mixture to water, an acidic aqueous solution, or a basic aqueous solution. The ratio of the alkenyl halosilane to the alkyl halosilane is about 10:1 to about 1:10. The alkenyl halosilane and the alkyl halosilane are mixed at about 20° C. to about 45° C. The reaction product is separated and washed with saturated alkali carbonate solution.
Claims20
A process for making alkenyl disiloxanes, comprising:
- combining an alkenyl halosilane with an alkyl halosilane and adding the mixture to water, an acidic aqueous solution, or a basic aqueous solution, wherein:
- the alkenyl halosilane has Formula A
- and
- the alkyl halosilane has Formula B
- wherein:
- X is, independently at each occurrence, F, Cl, Br or I;
- n is 0, 1, 2, 3, 4, 5, or 6;
- R1 is, independently at each occurrence, H or C1-C3 alkyl;
- R2 is, independently at each occurrence, H or C1-C3 alkyl;
- also provided that one or more of R1 and one or more of R2 can combine to form a ring;
- R3 is, independently at each occurrence, H or C1-C6 alkyl;
- one R4 is H;
- and
- each remaining R4 are C1-C3 alkyl at each occurrence.
11 more elements
Dependencies are inferred from the claim text.