US4895914A
Expired / Lapsed
US
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Surface treated polymethylsilsesquioxane powder
Assignee: Momentive Performance Materials Japan LLC
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Filing: 1988-11-08
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Granted: 1990-01-23
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Expires: 2008-11-08
Abstract
Abstract A polymethylsilsesquioxane powder according to the present invention is characterized by being surface treated with an organic silicon compound represented by the following general formula: (R.sub.3 Si)aZ wherein R represents a non-substituted monovalent hydrocarbon group, a represents a numeral of 1 or 2, and Z represents a hydrogen atom, a halogen atom, a hydroxyl group, --OR', --NR'X, --ONR' 2 or --OOCR' when a is 1, while --O--, --N(X) or --S-- when a is 2, wherein R' represents an alkyl group having 1 to 4 carbon atoms, and X a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
Inventors
- 👤 Kenji Saitoh
- 👤 Hiroshi Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:52
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/04; C08K9/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2991; Y10T428/2993; Y10T428/2995; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
95 words
A polymethylsilsesquioxane powder characterized by being surface treated with an organic silicon compound represented by the following general formula: (R.sub.3 Si)aZ wherein R represents a non-substituted monovalent hydrocarbon group, a represents a numeral of 1 or 2, and Z represents a hydrogen atom, a halogen atom, a hydroxyl group, --OR', --NR'X, --ONR' 2 or --OOCR' when a is 1, while --O--, --N(X) or --S-- when a is 2, wherein R' represents an alkyl group having 1 to 4 carbon atoms, and X a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
Claim 2
Dependent Claim
95 words
A polymethylsilsesquioxane powder characterized by being surface treated with an organic silicon compound represented by the following general formula: (R.sub.3 Si)aZ wherein R represents a non-substituted monovalent hydrocarbon group, a represents a numeral of 1 or 2, and Z represents a hydrogen atom, a halogen atom, a hydroxyl group, --OR', --NR'X, --ONR' 2 or --OOCR' when a is 1, while --O--, --N(X) or --S-- when a is 2, wherein R' represents an alkyl group having 1 to 4 carbon atoms, and X a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
Claim 3
Dependent Claim
50 words
A polymethylsilsesquioxane powder according to claim 1, wherein the particles of said polymethylsilsesquioxane powder are separate from each other and substantially spherical and in at least 80% of the particles in the particle size distribution thereof have a particle diameter in the range of ±30% of the average particle diameter.
Claim 4
Dependent Claim
29 words
A polymethylsilsesquioxane powder according to claim 1, wherein said monovalent hydrocarbon group represented by R in said general formula is an alkyl group having 1 to 4 carbon atoms.
Claim 5
Dependent Claim
17 words
A polymethylsilsesquioxane powder according to claim 1, wherein said compound represented by said general formula is hexamethyldisilazane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |