Patent US4935484A successfully refreshed from Google Patents.
US4935484A
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Silicone resin powder and a process for preparing the same
Assignee: Wacker Chemie AG
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Filing: 1988-05-16
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Granted: 1990-06-19
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Expires: 2008-05-16
Abstract
Abstract Silicone resin powders are obtained by spray drying aqueous colloidal suspensions of organopolysiloxanes which are prepared by adding an alkoxysilane and/or a partial hydrolysate thereof and, if appropriate, mixed with an organo(poly)siloxane which is free of alkoxy groups and contains a maximum of 8 siloxane units per molecule, to water in the presence of an emulsifier at a maximum rate of 5 moles of organosilicon compound per hour per liter of water.
Inventors
- 👤 Matthias Wolfgruber
- 👤 Bernward Deubzer
- 👤 Volker Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:07
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/122; C08G; C08G77/00; C08G77/04; C08G77/06; C09; C09D; C09D7/00; C09D7/40; C09D7/42; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
159 words
A process for preparing a silicone resin powder which comprises forming an aqueous colloidal suspension of an organopolysiloxane by adding an organosilicon compound selected from the group consisting of (a) at least one alkoxysilane; (b) a partial hydrolyzate of (a); (c) a mixture of (a) and (b); (d) a mixture of an organo(poly)siloxane which is free of alkoxy groups and has a maximum of 8 siloxane units per molecule with (a) (e) a mixture of an organo(poly)siloxane which is free of alkoxy groups and has a maximum of 8 siloxane units per molecule with (b); and (f) a mixture of an organo(poly)siloxane which is free of alkoxy groups and has a maximum of 8 siloxane units per molecule with (a) and (b) to water in the presence of an emulsifier at a maximum rate of 5 moles of organosilicon compound per hour per liter of water, distilling off the hydrolytically-formed alkanol and thereafter spray drying the resultant aqueous suspension.
Claim 2
Dependent Claim
159 words
A process for preparing a silicone resin powder which comprises forming an aqueous colloidal suspension of an organopolysiloxane by adding an organosilicon compound selected from the group consisting of (a) at least one alkoxysilane; (b) a partial hydrolyzate of (a); (c) a mixture of (a) and (b); (d) a mixture of an organo(poly)siloxane which is free of alkoxy groups and has a maximum of 8 siloxane units per molecule with (a) (e) a mixture of an organo(poly)siloxane which is free of alkoxy groups and has a maximum of 8 siloxane units per molecule with (b); and (f) a mixture of an organo(poly)siloxane which is free of alkoxy groups and has a maximum of 8 siloxane units per molecule with (a) and (b) to water in the presence of an emulsifier at a maximum rate of 5 moles of organosilicon compound per hour per liter of water, distilling off the hydrolytically-formed alkanol and thereafter spray drying the resultant aqueous suspension.
Claim 3
Dependent Claim
104 words
The process of claim 1, wherein the organopolysiloxane has units of the formula ##STR3## in which R is selected from the group consisting of a hydrogen atom, a monovalent hydrocarbon radical having from 1 to 8 carbon radical in which the substituents are inert to water, R 1 is selected from the group consisting of a hydrogen atom, an alkyl radical and an aIkoxyalkylene radical having from 1 to 4 carbon atoms per radical, x is 0, 1, 2 or 3, with an average of from 1.0 to 2.0 and y is 0, 1 or 2, with an average of from 0.0 to 0.5.
Claim 4
Dependent Claim
27 words
The process of claim 1, wherein the amount of emulsifier ranges from about 0.5 to 2.9 percent by weight based on the weight of the organosilicon compound.
Claim 5
Dependent Claim
31 words
The process of claim 1, wherein the organosilicon compound is added to water at a rate of from 0.5 to 1.0 mole of organosilicon compound per hour per liter of water.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |