Patent US4846409A successfully refreshed from Google Patents.
US4846409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of granules
Assignee: Bayer AG
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Filing: 1987-09-28
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Granted: 1989-07-11
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Expires: 2007-09-28
Abstract
Abstract Low-dust, storage-stable granules are obtained in a continuous operating process in which the powder to be granulated is granulated in succession in a high-speed and low-speed mixing granulator, with the addition of a granulating liquid, and is then dried in a fluidized bed into which a liquid containing a binder is sprayed. The process is particularly suitable for the preparation of dyestuff granules which can easily be dispersed in the use medium.
Inventors
- 👤 Vaclav Kaspar
- 👤 Manfred Baecker
- 👤 Horst Brandt
- 👤 Friedrich Grimmelijkhuizen
- 👤 Karlheinz Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:01
CPC Classifications
C; C09; C09D; C09D17/00; B; B01; B01J; B01J2/00; B01J2/10; C09B; C09B67/00; C09B67/0071; C09B67/0092; C09B67/0095
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
A process for the continuous preparation of granules comprising: providing pulverulent material to be granulated, granulating the material with a granulating liquid in a high-speed mixing granulator with a shaft rotating at 800-3000 rpm, continuously feeding the product obtained from the granulator directly to a slow-speed mixing granulator for subsequent granulation and thereafter continuously drying the product in a fluidized bed drier while simultaneously spraying with a forming auxiliary, wherein the amount of granulating liquid added is 10 to 50% by weight in the high speed mixing granulator and 0 to 10% by weight in the slow speed mixing granulator.
Claim 2
Dependent Claim
100 words
A process for the continuous preparation of granules comprising: providing pulverulent material to be granulated, granulating the material with a granulating liquid in a high-speed mixing granulator with a shaft rotating at 800-3000 rpm, continuously feeding the product obtained from the granulator directly to a slow-speed mixing granulator for subsequent granulation and thereafter continuously drying the product in a fluidized bed drier while simultaneously spraying with a forming auxiliary, wherein the amount of granulating liquid added is 10 to 50% by weight in the high speed mixing granulator and 0 to 10% by weight in the slow speed mixing granulator.
Claim 3
Dependent Claim
12 words
The process according to claim 1, wherein the granulating liquid is water.
Claim 4
Dependent Claim
21 words
The process according to claim 1, wherein the forming auxiliary in the drier is used in amounts of 0.2-10% by weight.
Claim 5
Dependent Claim
16 words
The process according to claim 1, wherein the forming auxiliary is a liquid containing a binder.
Claim 6
Dependent Claim
21 words
The process according to claim 4, wherein the binder content in the auxiliary added to the drier is 5-50% by weight.
Claim 7
Dependent Claim
20 words
The process according to claim 1, wherein the speed of shaft rotating of the slow-speed mixing granulator is 60-250 rpm.
Claim 8
Dependent Claim
15 words
The process according to claim 1, wherein the material to be granulated is a dyestuff.
Claim 9
Dependent Claim
18 words
The process according to claim 1, wherein the speed of the high speed mixing granulator is 1500 rpm.
References Cited (Backward Citations)
US2306698A
Cited
FR1469883A
Cited
DE2263968A1
Cited
GB1511746A
Cited
US4238199A
Cited
GB1567734A
Cited
EP0024654A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |