Patent US1358060A successfully refreshed from Google Patents.
Patent US4017528A successfully refreshed from Google Patents.
US4017528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of organically modified silicon dioxides
Assignee: Merck Patent GmbH
•
Filing: 1974-11-11
•
Granted: 1977-04-12
•
Expires: 1994-11-11
Abstract
Abstract Process for the preparation of modified, porous silicon dioxides by the hydrolytic polycondensation of tetraalkoxysilanes or polyalkoxysiloxanes in the heterogenous phase in the presence of an organoalkoxysilane.
Inventors
- 👤 Klaus Unger
- 👤 Jurgen Schick-Kalb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:14
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/286; B01J20/02; B01J20/10; B01J20/103; B01J20/22; B01J20/26; B01J20/262; B01J20/28; B01J20/28054; B01J20/28057; B01J20/28069; B01J20/30; B01J20/3092; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3242; B01J20/3244; B01J20/3246; B01J20/3257; B01J20/3268; B01J20/3272; C; C08; C08G; C08G77/00; C08G77/02; C08G83/00; C08G83/001; B01J2220/00; B01J2220/50; B01J2220/54; B01J2220/58
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
In a process for the production of a porous silicon dioxide bearing organosilyl groups on the surface thereof by the hydrolytic polycondensation of a tetraalkoxysilane or a polyalkoxysiloxane in the heterogeneous phase, the improvement which comprises conducting the hydrolytic polycondensation in the presence of a monomeric organoalkoxysilane, the organogroup of which is not hydrolyzable under conditions of said hydrolytic polycondensation, thereby producing a porous silicon dioxide bearing organic groups which are part both of the skeleton structure and the surface of the porous silicon dioxide.
Claim 2
Dependent Claim
85 words
In a process for the production of a porous silicon dioxide bearing organosilyl groups on the surface thereof by the hydrolytic polycondensation of a tetraalkoxysilane or a polyalkoxysiloxane in the heterogeneous phase, the improvement which comprises conducting the hydrolytic polycondensation in the presence of a monomeric organoalkoxysilane, the organogroup of which is not hydrolyzable under conditions of said hydrolytic polycondensation, thereby producing a porous silicon dioxide bearing organic groups which are part both of the skeleton structure and the surface of the porous silicon dioxide.
Claim 3
Dependent Claim
46 words
A process according to claim 1, wherein the monomeric organoalkoxysilane is of the formula R.sub.n -- -- Si 13 (OR.sub.1).sub.4-n wherein R is an alkyl, aryl, or aralkyl group; R 1 is alkyl of 1-4 carbon atoms; and n is the integer 1, 2 or 3.
Claim 4
Dependent Claim
10 words
A process according to claim 2 wherein n is 1.
Claim 5
Dependent Claim
11 words
A process according to claim 3 wherein R 1 is ethyl.
Claim 6
Dependent Claim
31 words
A process according to Claim 3 wherein R is alkyl of 1-4 carbon atoms, carbocyclic aryl of 6-10 carbon atoms or aralkyl with a carbocyclic aryl portion containing 6-10 carbon atoms.
Claim 7
Dependent Claim
11 words
A process according to claim 5 wherein R 1 is ethyl.
Claim 8
Dependent Claim
16 words
A process according to claim 6, wherein R is methyl, vinyl, n-pentyl, n-octadecyl, benzyl or phenyl.
Claim 9
Dependent Claim
25 words
A process according to claim 1 wherein 0.1-3.0 moles of organoalkoxysilane is employed per mole of SiO 2 in the tetraalkoxysilane or in the polyalkoxysiloxane.
Claim 10
Dependent Claim
44 words
A porous silicon dioxide bearing organosilyl groups on the surface thereof, produced according to the process of claim 1, thereby producing a porous silicon dioxide bearing organic groups which are part both of the skeleton structure and the surface of the porous silicon dioxide.
Claim 11
Dependent Claim
18 words
A process according to claim 1 wherein alkoxy in the tetraalkoxysilane or polyalkoxysiloxane is of 1-4 carbon atoms.
References Cited (Backward Citations)
GB603076A
Cited
US3686357A
Cited
US3892678A
Cited
US3846358A
Cited
US3853934A
Cited
US3853933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |