US4076935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding method for cellulose
Assignee: Hoechst AG
•
Filing: 1975-12-12
•
Granted: 1978-02-28
•
Expires: 1995-12-12
Abstract
Abstract A method of reducing the particle size of cellulose compounds selected from the group consisting of cellulose and ether derivatives thereof which comprises grinding said compounds in a vibration mill in the presence of air and in the presence of sufficient water to yield a product having a water content of from 2 to 10% by weight, wherein at least 50% of the particles in the product have a particle size of 100 μ or less, a product obtained by said method and a binder composition containing said product.
Inventors
- 👤 Franz Eichenseer
- 👤 Dieter Steidl
- 👤 Walter Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:40
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; B; B02; B02C; B02C19/00; B02C19/0056; B02C19/16; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B24/383; C08J2301/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
74 words
A method of reducing the particle size of a cellulose compound, selected from the group consisting of cellulose and an ether derivative thereof, which comprises grinding the compound in a vibration mill in contact with air and with sufficient water to yield a product having a water content of from 2 to 10% by weight and wherein at least 50% of the particles in the product have a particle size of 100μ or less.
Claim 2
Independent Claim
74 words
A method of reducing the particle size of a cellulose compound, selected from the group consisting of cellulose and an ether derivative thereof, which comprises grinding the compound in a vibration mill in contact with air and with sufficient water to yield a product having a water content of from 2 to 10% by weight and wherein at least 50% of the particles in the product have a particle size of 100μ or less.
Claim 3
Dependent Claim
48 words
A method as claimed in claim 1 wherein the cellulose compound is a member selected from the group consisting of alkyl cellulose, hydroxy-alkyl cellulose, alkylhydroxyalkyl cellulose and carboxyalkyl cellulose, wherein the alkyl contains up to 2 carbon atoms and wherein the hydroxyalkyl contains up to 3 carbon atoms.
Claim 4
Dependent Claim
43 words
A method as claimed in claim 1 which comprises grinding, in a single grinding operation, an uncompressed starting material having a bulk density of from 120 to 200 g/l to obtain a product having a bulk density of from 280 to 350 g/l.
Claim 5
Dependent Claim
35 words
A method as claimed in claim 1 which comprises operating the vibration mill 5 at a vibration frequency of from 1000 to 1800 rotations/min. and at a vibration amplitude of from 6 to 12 mm.
Claim 6
Dependent Claim
47 words
A method as claimed in claim 1 which comprises grinding, in a single grinding operation, a starting material having a water content of at least 10% by weight to obtain a product having a bulk density of from 1.4 to 2.9 times that of the starting material.
Claim 7
Dependent Claim
40 words
A method as claimed in claim 1 which comprises reacting cellulose ether, prior to or subsequent to grinding, with up to 5% by weight, based on the weight of the cellulose ether, of glyoxal with partial acetal formation and cross-linking.
Claim 8
Dependent Claim
28 words
A method as claimed in claim 1 which comprises grinding a mixed cellulose ether, wherein at least 90% by weight of the ether groups are methyl ether groups.
Claim 9
Dependent Claim
29 words
A method as claimed in claim 1 which comprises grinding a mixed cellulose ether wherein from 1.5 to 10% by weight of the ether groups are hydroxyethyl ether groups.
Claim 10
Dependent Claim
37 words
A method as claimed in claim 1 which comprises grinding a coarse or tough methyl cellulose in a single grinding operation to a free-flowing powder having a relatively high bulk density of from 480 to 520 g/l.
Claim 11
Dependent Claim
41 words
A particle-size-reducing method as claimed in claim 1 wherein the cellulose compound, prior to grinding, is a starting material having a bulk density of from 120 to 520 g/l, the method comprising grinding the starting material in a single grinding operation.
Claim 12
Dependent Claim
43 words
A method as claimed in claim 1 which comprises grinding, in a single grinding operation, a compressed starting material having a bulk density of from 480 to 520 g/l to obtain a product having a bulk density of from 370 to 450 g/l.
Claim 13
Dependent Claim
23 words
A process as claimed in claim 11 wherein the starting material has been compressed by treatment in a kneader with addition of water.
Claim 14
Dependent Claim
24 words
A process as claimed in claim 12 wherein the starting material is preliminarily compressed by kneading in a kneader with water and then extruded.
Claim 15
Dependent Claim
16 words
A binder composition containing a product obtained according to a method as claimed in claim 1.
References Cited (Backward Citations)
US2176678A
Cited
US2565420A
Cited
GB683627A
Cited
GB737127A
Cited
US2833758A
Cited
US3084876A
Cited
US3286939A
Cited
GB1080249A
Cited
US3645458A
Cited
US3774855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |