US5387467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for modifying the surface of finely divided particles by the application of organofunctional polysiloxanes
Assignee: Evonik Operations GmbH
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Filing: 1992-12-03
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Granted: 1995-02-07
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Expires: 2012-12-03
Abstract
Abstract A method for modifying the surface of finely divided particles, such as pigments and filler or glass fiber, is described. The method utilizes organopolysiloxanes with ester groups and long-chain alkyl groups, which are linked over carbon atoms to silicon atoms.
Inventors
- 👤 Werner Hohner
- 👤 Dietmar Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:57
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/24; C03C25/40; C09; C09C; C09C3/00; C09C3/12; C01; C01P; C01P2006/00; C01P2006/22; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2962; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995; Y10T428/2998
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
230 words
A method for modifying the surface of a particle which comprises applying to the particle, an organosiloxane with ester groups and long-chain alkyl groups linked over carbon atoms to silicon atoms and having the general formula ##STR4## wherein R 1 is an alkyl group with 1 to 4 carbon atoms or a phenyl group, with the proviso that at least 90% of the R 1 groups are CH 3 , R 2 is selected from the group consisting of R 1 , R 3 and R 4 with the proviso that 50 to 99% of the R 2 groups have the same meaning as R 1 the remaining groups being R 3 and R 4 , whereby each R 3 is a group of the formula --(CH 2 ) n --CO--OR 5 , where R 5 is an alkyl group with 1 to 4 carbon atoms and n is a number from 6 to 16, and R 4 is a linear or branched alkyl group with 6 to 30 carbon atoms, with the proviso that (a) the ratio of R 3 to R 4 is within the range of 1:25 to 10:1, (b) at least one R 3 group and at least one R 4 group must be present in the average molecule, a is a number from 1 to 500, and b is a number from 0 to 10.
Claim 2
Independent Claim
230 words
A method for modifying the surface of a particle which comprises applying to the particle, an organosiloxane with ester groups and long-chain alkyl groups linked over carbon atoms to silicon atoms and having the general formula ##STR4## wherein R 1 is an alkyl group with 1 to 4 carbon atoms or a phenyl group, with the proviso that at least 90% of the R 1 groups are CH 3 , R 2 is selected from the group consisting of R 1 , R 3 and R 4 with the proviso that 50 to 99% of the R 2 groups have the same meaning as R 1 the remaining groups being R 3 and R 4 , whereby each R 3 is a group of the formula --(CH 2 ) n --CO--OR 5 , where R 5 is an alkyl group with 1 to 4 carbon atoms and n is a number from 6 to 16, and R 4 is a linear or branched alkyl group with 6 to 30 carbon atoms, with the proviso that (a) the ratio of R 3 to R 4 is within the range of 1:25 to 10:1, (b) at least one R 3 group and at least one R 4 group must be present in the average molecule, a is a number from 1 to 500, and b is a number from 0 to 10.
Claim 3
Dependent Claim
27 words
The method according to claim 1, wherein the particle is one of the group consisting of pigments, glass fibers, and fillers other than pigments and glass fibers.
Claim 4
Dependent Claim
29 words
A preparation for modifying a particle comprising the particle and between 0.1 to 5% by weight, based on the particle to be modified, of the compound of claim 1.
Claim 5
Dependent Claim
9 words
A particle modified by the method of claim 1.
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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) | 1998-02-06 | 1998-08-08 | 1999-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-06 | 2002-08-08 | 2003-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-06 | 2006-08-08 | 2007-02-07 | $7700.00 | Window Closed / Lapsed |