Patent US5281478A successfully refreshed from Google Patents.
US5281478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for modifying the surface of finely divided particles by the application of organofunctional polysiloxanes
Assignee: Evonik Goldschmidt GmbH
•
Filing: 1992-12-03
•
Granted: 1994-01-25
•
Expires: 2012-12-03
Abstract
Abstract A method for modifying the surface of finely divided particles, such as pigments and fillers, or of glass fibers is described. The method utilizes organopolysiloxane with epoxy and long-chain alkyl groups linked over carbon atoms to silicon atoms.
Inventors
- 👤 Werner Hohner
- 👤 Dietmar Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:26
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/12; C03; C03C; C03C25/00; C03C25/10; C03C25/24; C03C25/40; C01; C01P; C01P2002/00; C01P2002/02; C01P2006/00; C01P2006/22; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995; Y10T428/2998
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
177 words
A method for modifying the surface of a particle which comprises applying to the particle organopolysiloxanes with epoxy and long-chain alkyl groups linked over carbon atoms to silicon atoms of the general formula ##STR6## wherein R 1 is an alkyl group with 1 to 4 carbon atoms or a phenyl group, at least 90% of the R groups, however, being CH 3 groups; R 2 is identical with R 1 to the extent of 50 to 99% and is R 3 and R 4 to the extent of 1 to 50%; R 3 being a group having the formula ##STR7## or mixtures thereof; R 4 being a branched alkyl group with 6 to 30 carbon atoms; the ratio of the R 3 group to the R 4 group falling within the range of 1:25 to 10:1, with the proviso that 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
177 words
A method for modifying the surface of a particle which comprises applying to the particle organopolysiloxanes with epoxy and long-chain alkyl groups linked over carbon atoms to silicon atoms of the general formula ##STR6## wherein R 1 is an alkyl group with 1 to 4 carbon atoms or a phenyl group, at least 90% of the R groups, however, being CH 3 groups; R 2 is identical with R 1 to the extent of 50 to 99% and is R 3 and R 4 to the extent of 1 to 50%; R 3 being a group having the formula ##STR7## or mixtures thereof; R 4 being a branched alkyl group with 6 to 30 carbon atoms; the ratio of the R 3 group to the R 4 group falling within the range of 1:25 to 10:1, with the proviso that 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
21 words
The method according to claim 1, wherein the particle is one of the group consisting of pigments, fillers and glass fibers.
Claim 4
Dependent Claim
9 words
A particle modified by the method of claim 1.
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) | 1997-01-24 | 1997-07-26 | 1998-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-24 | 2001-07-26 | 2002-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-24 | 2005-07-26 | 2006-01-25 | $7700.00 | Window Closed / Lapsed |