IE41403B1 - Improvements in or relating to a process for coating water soluble or water dispersible particles by means of the fluid bed technique - Google Patents
Improvements in or relating to a process for coating water soluble or water dispersible particles by means of the fluid bed techniqueInfo
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- IE41403B1 IE41403B1 IE1568/74A IE156874A IE41403B1 IE 41403 B1 IE41403 B1 IE 41403B1 IE 1568/74 A IE1568/74 A IE 1568/74A IE 156874 A IE156874 A IE 156874A IE 41403 B1 IE41403 B1 IE 41403B1
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- coating
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- particles
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/38—Products with no well-defined composition, e.g. natural products
- C11D3/386—Preparations containing enzymes, e.g. protease or amylase
- C11D3/38672—Granulated or coated enzymes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/006—Coating of the granules without description of the process or the device by which the granules are obtained
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/1872—Details of the fluidised bed reactor
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Combustion & Propulsion (AREA)
- Wood Science & Technology (AREA)
- Medicinal Preparation (AREA)
- Detergent Compositions (AREA)
- Manufacturing Of Micro-Capsules (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Immobilizing And Processing Of Enzymes And Microorganisms (AREA)
- Paints Or Removers (AREA)
Abstract
1483591 Spray coating particles NOVA INDUSTRI AS 10 July 1974 [23 July 1973 11 March 1974] 34993/73 and 10842/74 Heading B2E [Also in Division C3] A process for coating water soluble or dispersible particles having a mean diameter of 0.1 to 0.6 mm, comprises introducing the particles into a fluidised bed chamber and introducing a coating material consisting of an aqueous solution or dispersion of a macromolecular, film-forming water soluble or dispersible coating agent by means of atomisation, wherein the relative humidity of air leaving the fluidised bed is below 100% and the maximum size of the atomised droplets of the coating fluid does not exceed the minimum size of the particles. Suitable particles are proteolytic enzymes, bacterial proteinases, which may have anti-dust precoats, e.g. as described in Specification 1243784, and bacterial or fungal amylases, e.g. as described in Specification 1269839. Other particles mentioned are of penicillin and fertilisers. The particles are preferably of irregular shape. Suitable coating materials are alginates, methyl cellulose, hydroxybutyl methyl cellulose, sodium carboxymethyl cellulose, hydroxyethylmethyl cellulose, hydroxypropylmethyl cellulose, polyvinylpyrrolidone, polyethylene glycol, polypropylene glycol, methacrylic resin, and gelatin, optionally containing up to 60 dry wt. % glycerol plasticiser, or containing triacetin plasticiser.
Description
This invention relates to a process for coating water soluble or water dispersible particles by means of the fluid bed technique.
It is known to coat various particulate products having a particle size of less than about 10 mm, preferably less than 1 mm, in order to minimize dust formation, e.g. enzyme containing additives for detergent compositions in powder form. However, considerable difficulties have been experienced in performing this coating. In practice it has hitherto been usual to utilize coating agents dissolved in organic solvents rather than in water when coating water soluble particles. The organic solvents have to be evaporated and recovered at a later stage of the process and may, furthermore, create a fire hazard and environmental problems. If, on the other hand, the organic solvent is not recovered, the coating process works in an uneconomical way.
Also, it is known to utilize the fluid bed technique to coat various water soluble or water dispersible particles by atomization of aqueous solutions of film forming, water soluble coating agents, this process being described in Wurster's U.S.A. Patent No. 3,1 96,827. However, in this known process,it is difficult to avoid agglomeration of the particles to be coated, and it is mentioned that this known process is only suited for particles bigger than 30 mesh (ab. 0.6 mm). Also, by using Wurster's method it is difficult to obtain thin coatings.
We have now found that it is possible to utilize an aqueous liquid for coating particulate products having a particle size of less than about 1 mm (mean diameter in the range of from 0.1 to 0.6 mm) in a fluid bed process whereby particles can be coated with an extremely thin coating and without substantial danger of agglomeration.
According to the present invention there is provided a process for coating water soluble or water dispersible particles by means of the fluid bed technique, which process comprises introduction of the particles to be coated in a fluid bed reactor the mean diameter of the particles to be coated being in the range of from 0.1 mm to 0.6 mm, and introduction of a coating material essentially consisting of an aqueous solution or dispersion of a raacromolecular film forming, water soluble or water dispersable coating agent by means of atomization, whereby the relative humidity of the outlet air from the fluid bed is below 100% and wherein the maximum size of the atomized droplets of the coating fluid does not exceed the minimum size of the particles to be coated.
If the maximum size of the atomized droplets of the coating fluid exceeds the minimum size of the particles to be coated, agglomeration will occur.
Thus, by means of the invention agglomeration can be avoided, and it is possible to perform the coating with a layer as thin as about 0.1-10u , in a preferred embodiment 0.5-lu , corresponding to about 1% of the dry particle weight. For a given thickness of the layer of coating agent a larger amount of coating agent, calculated on the particle weight, will be used with decreasing particle size. This will appear from the following Table I.
TABLE I.
Amount of coating agent, calculated as per cent by weight of the particles to be coated
ALCALASE P ALCALASE M Thickness of Mean diameter of Mean diamater of coati ng particles 400 μ particles 700 μ 0.5 μ 0.8% 0.5% 1.0 μ 1.5% 0.9% Although the coating produced according to the invention in a
preferred embodiment is very thin it is, according to the invention, also possible to produce coatings as thick as about 100 μ , if desired.
The minimum size of the particles to be coated can be determined by sieve analysis, and the maximum size of the atomized droplets of coating fluid can be read from charts available from the manufacture of the nozzle, when the viscosity of the fluid and the pressure are known.
In a preferred embodiment of the process according to the invention the water soluble or water dispersable particles to be coated contain one or
- 3 41403 more enzymes, for example, proteases, amylases, lipases or celluloses.
In another preferred embodiment of the process according to the invention the enzyme or enzymes are bacterial proteinases.
In another preferred embodiment of the process according to the invention the bacterial proteinases are precoated in order to reduce dust formation.
In another preferred embodiment of the process according to the invention the bacterial proteinases are microbial proteinases such as ALCALASE P or ALCALASE M or/are alkaline resistant proteinases manufactured according to British Patent Specification No. 1,243,784.
ALCALASE, which is a trade mark belonging to NOVO INDUSTRI A/S, is a microbial proteinase. ALCALASE P is a prilled ALCALASE. ALCALASE M is ALCALASE which is treated by means of a Marumerizer (Marumerizer is a trade mark) as described in British Patent Specification No. 1,352,365 and French Patent Specification No. 2,099,349.
In another preferred embodiment of the process according to the invention the enzyme or enzymes are bacterial or fungal carbohydrates.
In another preferred embodiment of the process according to the invention the bacterial amylases are thermally stable amylases manufactured according to British Patent Specification No. 1,296,839.
In another preferred embodiment of the process according to the invention the macromolecular film forming, water soluble or water dispersable coating agent is a cellulose derivative.
In another preferred embodiment of the process according to the invention the cellulose derivative is methyl cellulose, hydroxybutylmethyl cellulose, sodium carboxymethyl cellulose, hydroxyethylmethyl cellulose or hydroxypropylmethyl cellulose.
In another preferred embodiment of the process according to the invention the macromolecular film forming, water soluble or water dispersable coating agent is a polyvinylpyrrolidone.
In another preferred embodiment of the process according to the invention the macromolecular film forming, water soluble or water dispersable coating agent is a polyethylene glycol, preferably of a molecular weight of from 400 to 6000.
- 4 4140S
In another preferred embodiment of the process according to the invention the macromolecular film forming, water soluble or water dispersable coating agent is a methacrylic resin.
In another preferred embodiment of the process according to the invention the macromolecular film forming, water soluble or water dispersable coating agent is gelatine.
In another preferred embodiment of the process according to the invention the coating fluid contains a plasticizer.
In another preferred embodiment of the process according to the invention the plasticizer is a glycerol.
In another preferred embodiment of the process according to the invention the glycerol is used in an amount of up to 60S of the dry weight of the coating agent, preferably in an amount of between 10 and 30S of the dry weight of the coating agent.
In another preferred embodiment of the process according to the invention the concentration of the macromolecular film forming, water soluble or water dispersable coating agent in the coating fluid is between 2 and 50 weight-S.
In another preferred embodiment of the process according to the invention the concentration of the macromolecular film forming, water soluble or water dispersable coating agent in the coating fluid is between 4 and 10 weight-S.
In another preferred embodiment of the process according to the invention the mean diameter of the particles to be coated is in the range of from 0.2 to 0.6 mm.
In another preferred embodiment of the process according to the invention the thickness of the coating layer is in the range of from 0.1 to 10 u .
In another preferred embodiment of the process according to the invention the thickness of the coating layer is in the range of from 0.5 to 1 u .
The process according to the invention can be carried out in a continuous manner as well as batchwise. However, in a preferred embodiment
- 5 41403 of the invention the process is carried out batchwise. In all the following examples the process is carried out batchwise.
The invention also encompasses a coated product comprising coated water soluble or water dispersable particles, whenever prepared by means of the process according to the invention.
The water soluble or water dispersable particles can be of any material which, for any reason, is to be coated. Examples of materials encompassed are enzyme additives, for example, proteolytic enzyme additives for detergents, particulate medicaments, for example, oral penicillin preparations or hygroscopic substances, for example, fertilizers.
Coating of the particles is carried out for various reasons, for example in order to minimise dust formation, protect against ultra-violet radiation, humidity or acidity, or to minimise contamination. ...
The coating agent can be any macromolecular film forming, water 15 soluble or water dispersable coating agent, for example *METHOCEL MC15:
methyl cellulose of a methoxy DS (Degree of Substitution) of 1.64 to 1.92 and of a DP (Degree of Polymerisation) corresponding to viscosities from 8 cP to 10,000 cP in a 2% aqueous solution at 20°C.
*TYLOSE CIO: sodium carboxymethyl cellulose of a DS from 0.4 to 20 1.5 and a DP from 50 to 1000.
*METHOCEL and *TYLOSE are Trade Marks
- 6 41405 *Tylose ΜΗ 20: methylhydroxyethyl cellulose (or hydroxyethylmethyl cellulose) of a methoxy OS from 1.0 to 2.0, a hydroxyethyl DS from 0.1 to 0.5 and a DP from 50 to 1000.
*Methocel XD 1181: hydroxypropyl methyl cellulose of a methoxy! DS from 1.0 to 2.0, a hydroxypropyl DS from 0.1 to 0.5, and a DP from 50 to 1000.
*Ko1lidon K 25 PVP: polyvinylpyrrolidone of an average molecular weight of 10,000, 40,000, 160,000 and 360,000 and mixtures thereof resulting in any intermediate average molecular weight and mixtures or single components modified with plasticizers such as carboxymethyl cellulose and cellulose acetate.
*Carbowax; polyethylene glycols of average molecular weight of
400, 600, 1000, 1540, 4000, 6000 and mixtures thereof of any intermediate average molecular weight.
*Eudragit E 30 D: methacrylic resins, aqueous dispersions thereof.
This tablet lacqqer is completely insoluble in alkaline liquids.
*Solugel : gelatine
Polypropylene glycols.
Polyvinyl alcohols.
Alginates.
The concentration of the coating agent in the aqueous or substantially aqueous solution or dispersion corresponds to a viscosity which is suitable for atomization. Usually, as mentioned before, the concentration is in the range of from 2 to 50 weight-/, preferably from 4 to 10 weights. The limits, however, are highly dependent on the individual coating agent used.
The average diameter of the particles to be coated is usually in the range of from 100 μ to 600, even to 1000 μ, preferably from 200μ to 600μ. The relative humidity of the outlet air should usually not exceed 60%. The temperature of the air, which is used to fluidize the particles to be coated, should be adjusted in consideration of the nature of the particles to be coated.
*Ty1ose, *Methocel, *Kol1idon, *Carbowax, *Eudragit and *Solugel are Trade Marks.
& a 4 ® $
The quality of the coating is not influenced by the shape of the particles. By use of the process of the invention it is possible to produce a continuous coating on spheres and on irregularly shaped particles as well. Several of the known coating procedures are not well adapted to the coating of irregularly shaped particles which are imperfectly coated, only. Therefore, the present process offers special advantages in connection with the coating of irregularly shaped particles. An example of such irregularly shaped particles is a prilled enzyme product including prilled ALCALASE or ALCALASE P. When prilled ALCALASE is coated in accordance with the invention a product consisting of irregularly shaped particles having a continuous coating is formed. Due to the irregular shape these particles have a very reduced tendency to segregate from the other particles of detergent compositions in powder form.
An additive consisting of spheroidal particles having a density different from the density of the particles of the other components of a powdery detergent composition will have a tendency to segregate from said other particles and thereby create an inhomogeneous detergent composition.
The above irregularly shaped particles therefore offer special advantages.
According to the invention the coating fluid may contain a plasticiser such as triacetin, which is illustrated in the following Example 2.
By using glycerol as a plasticiser in the coating fluid coated particles having advantageously low dust levels can be obtained according to the invention.
By using glycerol as a plasticiser in the coating fluid in an amount of up to 60 per cent of the dry weight of the coating agent or up to the point when the coated particles are beginning to adhere to each other, preferably in an amount in the range of from 10 to 30 per cent of the dry weight of the coating agent, the dust level of the coated particles is reduced significantly which will appear from the following.
In order to give a better understanding of how to correlate the different parameters of the process in order to obtain a relative humidity of the outlet air of less than 100% the following calculation with reference
- 8 41403 to Example 21 is presented. The inlet air, which was the air in the plant, had the following characteristics:
Temperature: 20°C
Relative humidity: 50% corresponding to 7g of HgO/kg air.
The rate of coating fluid was 1700 ml/min. or 102 litre/hour.
ο
The coating fluid had a specific gravity of 1.0 g/cm and contained 10% by weight of coating agent, corresponding to a water inlet amount from the coating fluid of 91.8 kg/hour.
The rate of fluidising air was 8000 N m /hour or 9600 kg of air/hour. Thus, the fluidising air introduced 0.007 x 9600 = 67.2 kg of water in the system per hour.
Thus, per hour a total of 91.8 + 67.2 kg of water was introduced into the system. This corresponds to 159.0 kg of water, which was removed from the system together with about 9600 kg of air. As the outlet air had a temperature of between 23° and 27°C this amount of humidity in the outlet air corresponds to a relative humidity in the outlet air of between 95 and 75%. It is noted that this relative humidity is within the limit given for the relative humidity in Claim 1.
In order to illustrate the invention the following examples are presented.
Examples 1 to 10 illustrate the preparation of the coating fluid. Example 1.
Methyl cellulose (METHOCEL MC 15) 50 g
Deionised water 1000 g
The methyl cellulose was triturated with about 333 g of boiling water, after which the rest of the water (optionally cold) was added with stirring. The solution was allowed to stand in a cold place.
Example 2.
Methyl cellulose (METHOCEL MC 15) 50 g
Deionised water 1000 g
Triacetin 5 g
A solution of methyl cellulose and deionised water was prepared as described in Example 1, whereupon the triacetin was added.
- 9 4 ί. 4 Ο §
Example 3.
Sodium carboxymethyl cellulose (TYLOSE C 10) 50 g
Deionised water 1000 g
The sodium carboxymethyl cellulose was dissolved in the water with stirring, using a high speed mixer.
Example 4.
Sodium carboxymethyl cellulose (TYLOSE C 10) 100 g
Deionised water 1000 g
The sodium carboxymethyl cellulose was dissolved in the water with stirring, using a high speed mixer.
Example 5.
Methyl hydroxyethyl cellulose (TYLOSE MH 20) 50 g
Deionised water 1000 g
The methyl hydroxyethyl cellulose was dissolved in the water with stirring, using a high speed mixer.
Example 6.
Hydroxypropylmethyl cellulose (METHOCEL XD 1181 50 g
Deionised water 1000 g
The hydroxypropylmethyl cellulose was dissolved in the water with stirring, using a high speed mixer.
Example 7.
Gelatine (SOLUGEL) 50 g
Deionised water 1000 g
The gelatine was dissolved in the water with stirring, using a high speed mixer.
Example 8.
Polyvinylpyrrolidone (KOLLIDON K 25) 50 g
Deionised water 1000 g
The polyvinylpyrrolidone was dissolved in the water with stirring, using a high speed mixer.
Example 9.
Polyethylene glycol (CARBOWAX 4000)
Deionised water g 1000 g
- 10 41403
The polyethylene glycol was dissolved in the water with stirring, using a high speed mixer.
Example 10.
Polyethylene glycol (CARBOWAX 6000) 50 g
Deionised water 1000 g
The polyethylene glycol was dissolved in the water with stirring, using a high speed mixer.
The solutions prepared according to Examples 1 to 10 were used for the coating of prilled ALCALASE (ALCALASE P) in four different fluid bed 10 systems as stated in Examples 11 to 14. Example 11. Apparatus: STREBA-l (Aeromatic AG, Basel) ALCALASE P: 1000 g Nozzle 15 Pressure 2 1/2 ato Internal diameter 0.8 mm Inlet temperature of fluidising air: 41°-43°C 2D Temperature of particulate material: 31°-33°C Feed rate of coating fluid : 6 1/2 ml/min. Fluidising air: 8-10 scale units Example 12. Apparatus: WSG-5 (W. Q1att, Haltingen( Germany) 25 ALCALASE P: 6000 g Nozzle Position of jacket: 0.5 Pressure 1 1/2 ato. Internal diameter: 1.2 mm 30 Inlet temperature of fluidising air: 42 -45°C Temperature of particulate material: 31°-33°C Feed rate of 35 coating fluid: 35 ml/min. Air velocity: 2 1/2 m/sec.
- 11 A ϋ <3 ¢5 3
Apparatus:
ALCALASE P:
Nozzle
Example 13.
“WSG-30 (W. Glatt, Haltingen, Germany) 45,000 g
Position of jacket: Pressure:
Internal diameter:
Inlet temperature of fluidising air:
Temperature of particulate material:
Feed rate of coating fluid: Fluidising air:
Apparatus: ALCALASE P:
Nozzle
0.3 ato.
1.8 mm
187 ml/min.
scale units
Example 14.
“STREBA-60 (Aeromatic AG, Basel) 135 kg
1.0 ato. - //
42°-45°C
Position of jacket:
Pressure:
Internal diameter:
Inlet temperature of fluidising air:
Temperature of particulate material: 31°-33°C
Feed rate of coating fluid: 325 ml/min.
Rate of Fluidising air: corresponding to position 3 of damper.
In all cases particulate products were produced having remarkably good properties.
The amount of coating layer on the particles and the amount of dust present in some of the coated products prepared according to Examples 12 to 14 appear from the following Table II.
- 12 41403
TABLE II.
Example No. Coating fluid prepared according to Example No. Amount of coating layer on coated product in ( Total Amount of dust 1/100 g of product 1 tnzyme” 1 1% 20 2,1 1 IS 20 1.6 6 18 5 0.8 12 1 1/28 20 2.6 1 1% 15 1.8 1 1 1/28 20 0.8 6 28 10 1.1 6 38 10 0.8 1 18 5 1.8 1 1/28 20 1.0 13 1 IS 5 1.0 1 18 10 1.6 14 1 1/28 50 3.4 1 18 15 1.6
Examples 15 to 20 illustrate the preparation of a coating fluid containing glycerol and corresponding coating fluids without glycerol.
Example 15.
Methyl cellulose (METHOCEL MC 15) 50 g
Deionised water 950 g
The methyl cellulose was triturated with about 333 g of boiling water, after which the rest of the water (optionally cold) was added with stirring. The solution was allowed to stand in a cold place.
Example 16.
Methyl cellulose (METHOCEL MC 15) 42.5 g
Glycerol 7.5 g
Deionised water 950.0 g
A solution of methyl cellulose and deionised water was prepared as described in Example 15, whereupon the glycerol was added.
- 13 Example 17.
Sodium carboxymethyl cellulose (*CELL0FAS B 5) 100 g
Deionised water 900 g
The sodium carboxymethyl cellulose was triturated with about
333 g of boiling water, after which the rest of the water (optionally cold) was added with stirring. The solution was allowed to stand in a cold place.
Example 18.
Sodium carboxymethyl cellulose (CELLOFAS B 5) 85 g
Glycerol 15 g
Deionised water 900 g
A solution of sodium carboxymethyl cellulose and deionised water was prepared as described in Example 17, whereupon the glycerol was added. Example 19.
Sodium carboxymethyl cellulose (*CEK0L HS) 100 g
Deionised water 900 g
A solution of sodium carboxymethyl cellulose and deionised water
Vias prepared as described in Example 17.
Example 20.
Sodium carboxymethyl cellulose (CEKOL HS) 85 g
Glycerol 15 g
Deionised water 900 g
A solution of sodium carboxymethyl cellulose and deionised water was prepared as described in Example 17, whereupon the glycerol was added. The solutions prepared according to Examples 15 to 20 were used for the coating of ALCALASE M in a fluid bed system as stated in Example 21. Example 21.
Apparatus: ALCALASE M: WSG-300 (W. Glatt, Haltingen, 600 kg Germany) Nozzle noxEis Internal diameter: 1.2 mm Jacket diameter: 6.0 mm Pressure: 6.0 ato.
* CELLOFAS and *CEKOL are Trade Marks.
- 14 41403
Inlet temperature of fluidising air:
46°-50°C
Temperature of n n particulate material: 23 -27°C 5 Feed rate of coating fluid: 1700 ml/min.
Fluidising air: 8000 N m /hour
In all casqs particulate products are produced having remarkably good properties, especially in regard to the low dust level.
The amount of dust present in the coated products prepared according to Example 21 appears from the following Table III.
TABLE III.
Example No. Coating fluid prepared according to Example No. Amount of coating layer on coated product Amount of dust in yg/100 g of product total Enzyme 15 1% 20 1.2 16 1% 10 0.5 21 17 1% 15 1.6 18 1% 10 0.7 20 19 1% 30 1.3 20 1% 10 0.8
It appears from the above Table III that by using glycerol as a plasticiser in the coating fluid a remarkably advantageous effect on the dust level of the coated particles was obtained.
Claims (72)
1. A process for coating water soluble or water dispersible particles by means of the fluid bed technique, which process comprises introduction of the particles to be coated in a fluid bed reactor, the mean diameter of the particles to be coated being in the range of from 0.1 to 0.6 mm, and introduction of a coating material essentially consisting of an aqueous solution or dispersion of a macro-molecular film forming, water soluble or water dispersible coating agent by means of atomization, wherein the relative humidity of outlet air from the fluid bed is below 10055 and wherein the maximum size of the atomized droplets of the coating fluid does not exceed the minimum size of the particles to be coated.
2. A process according to Claim 1, wherein the water soluble or water dispersible particles to be coated contain one or more enzymes.
3. A process according to Claim 2, wherein the enzyme or enzymes is/are bacterial proteinases.
4. A process according to Claim 3, wherein the bacterial proteinase(s) is/are precoated in order to reduce dust formation.
5. A process according to Claim 4, wherein the bacterial proteinase(s) is/are microbial proteinase(s).
6. A process according to Claim 3, wherein the bacterial proteinase(s) is/are alkaline resistant proteinase(s).
7. A process according to Claim 2, wherein the enzyme or enzymes is/are bacterial or fungal carbohydrase(s).
8. A process according to Claim 7, wherein the bacterial carbohydrase(s) is/are thermally stable amylase(s)« - 16 41403
9. A process according to any one of the preceding claims, wherein the macro-molecular film forming, water soluble or water dispersible coating agent is a cellulose derivative.
10. A process according to Claim 9, wherein the cellulose derivative is methyl cellulose, hydroxybutylmethyl cellulose, sodium carboxymethyl cellulose, hydroxyethylmethyl cellulose or hydroxypropylmethyl cellulose.
11. A process according to any one of Claims 1 to 8, wherein the macro-molecu!ar firm forming, water soluble or water dispersible co'ating agent is a polyvinyl pyrrol idone.
12. A process according to any one of Claims 1 to 8, wherein the macro-molecular film forming, water soluble or water dispersible coating agent is a polyethylene glycol.
13. A process according to Claim 12, wherein the polyethylene glycol has a molecular weight in the range of from 400 to 6000.
14. A process according to any one of Claims 1 to 8, wherein the macro-molecular film forming, water soluble or water dispersible coating agent is a methacrylic resin.
15. A process according to any one of Claims 1 to 8, wherein the macro-molecular film forming, water soluble or water dispersible coating agent is a gelatine.
16. A process according to any one of the preceding claims, wherein the coating fluid contains a plasticizer.
17. A process according to Claim 16, wherein the plasticizer is glycerol.
18. A process according to Claim 17, wherein the glycerol is used in an amount of up to 60% of the dry weight of the coating agent.
19. A process according to Claim 18, wherein the glycerol is -1741403 used in an amount in the range of from 10 to 30% of the dry weight of the coating agent.
20. A process according to any one of Claims 9 to 19, wherein the concentration of the macro-molecular film forming, water soluble or water dispersible coating agent in the coating fluid is in the range of from 2 to 50 weight %.
21. A process according to Claim 20, wherein the concentration of the macro-molecular film forming, water soluble or water dispersible coating agent in the coating fluid is in the range of from 4 to 10 weight %.
22. A process according to any one of the preceding claims, wherein the mean diameter of the particles to be coated is in the range of from 0.2. to 0.6 mm.
23. A process according to any one of the preceding claims, wherein the thickness of the coating layer is in the range of from 0.1 to 10 μ.
24. A process according to Claim 23, wherein the thickness of the coating layer is in the range of from 0.5 to 1 μ.
25. A process according to any one of the preceding claims, wherein the coating operation is performed batchwise.
26. A process for coating, substantially as described in foregoing Examples 11 and 1.
27. A process for coating, substantially as described in foregoing Examples Π and 2.
28. A process for coating, substantially as described in foregoing Examples Π and 3.
29. A process for coating, substantially as described in foregoing Examples 11 and 4.
30. A process for coating, substantially as described in foregoing Examples Π and 5. - 18 41403
31. A process for coating, substantially as described i n foregoing Examples 11 and 6.
32. A process for coating, substantially as descri bed i n foregoing Examples Π and 7.
33. A process for coating, substanti ally as described i n foregoing Examples IT and 8.
34. A process for coating, substantially as described in foregoing Examples 1.1. and 9.
35. A process for coating, substantially as descri bed in foregoing Examples IT and 10.
36. A process for coating, substantially as described i n foregoing Examples 12 and 1.
37. A process for coating, substantially as described i n foregoing Examples 12 and 2.
38. A process for coating, substantially as descri bed in foregoing Examples 12 and 3.
39. A process for coating, substantially as descri bed i n foregoing Examples 12 and 4.
40. A process for coating, substantially as descri bed i n foregoing Examples 12 and 5.
41. A process for coating, substantially as descri bed in foregoing Examples 12 and 6.
42. A process for coating, substantially as descri bed i n foregoing Examples 12 and 7.
43. A process for coating, substantially as descri bed i n foregoing Examples 12 and 8.
44. A process for coating, substantially as described in foregoing Examples 12 and 9.
45. A process for coating, substantially as descri bed in foregoing Examples 12 and 10.
46. A process for coating, substanti ally as described i n foregoing Examples 13 and 1· - 19 41403
47. A process for coating, substantially as described in foregoing Examples 13 and 2.
48. A process for coating, substantially as described in foregoing Examples 13 and 3.
49. A process for coating, substantially as described in foregoing /Examples 13 and 4.
50. A process for coating, substantially as described in foregoing Examples 13 and 5.
51. A process for coating, substantially as described in foregoing Examples 13 and 6.
52. A process for coating, substantially as described in foregoing Examples 13 and 7.
53. A process for coating, substantially as described in foregoing Examples 13 and 8.
54. A process for coating, substantially as described in foregoing Examples 13 and 9.
55. A process for coating, substantially as described in foregoing Examples 13. and 10.
56. A process for coating, substantially as described in foregoing Examples 14 and 1.
57 A process for coating, substantially as described in foregoing Examples 14 and 2.
58. A process for coating, substantially as described in foregoing Examples 14 and 3.
59. A process for coating, substantially as described in foregoing Examples 14 and 4.
60. A process for coating, substantially as described in' foregoing Examples 14 and 5.
61. A process for coating, substantially as described in foregoing Examples 14 and 6. - 20 41403
62. A process for coating, substantially as described in foregoing Examples 14 and 7.
63. A process for coating, substantially as described in foregoing Examples 14 and 8. 5
64. A process for coating, substantially as described in foregoing Examples 14 and 9.
65. A process for coating, substantially as described in foregoing Examples 14 and 10.
66. A process for coating, substantially as described in 10 foregoing Examples 21 and 15.
67. A process for coating, substantially as described in foregoing Examples 21 and 16.
68. A process for coating, substantially as described in foregoing Examples 21 and 17. 15
69. A process for coating, substantially as described in foregoing Examples 21 and 18.
70. A process for coating, substantially as described in foregoing Examples 21 and 19.
71. A process for coating, substantially as described in 20 foregoing Examples 21 and 20.
72. A coated product whenever prepared by the process of any one of the preceding claims.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB34993/73A GB1483591A (en) | 1973-07-23 | 1973-07-23 | Process for coating water soluble or water dispersible particles by means of the fluid bed technique |
GB1084274 | 1974-03-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
IE41403L IE41403L (en) | 1975-01-23 |
IE41403B1 true IE41403B1 (en) | 1980-01-02 |
Family
ID=26247797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE1568/74A IE41403B1 (en) | 1973-07-23 | 1974-07-23 | Improvements in or relating to a process for coating water soluble or water dispersible particles by means of the fluid bed technique |
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Country | Link |
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JP (1) | JPS5071583A (en) |
AT (1) | AT357979B (en) |
AU (1) | AU498649B2 (en) |
BE (1) | BE817930A (en) |
CA (1) | CA1049334A (en) |
CH (1) | CH604923A5 (en) |
DE (1) | DE2435008A1 (en) |
DK (1) | DK384574A (en) |
ES (1) | ES428475A1 (en) |
FI (1) | FI219474A (en) |
FR (1) | FR2238530B1 (en) |
GB (1) | GB1483591A (en) |
IE (1) | IE41403B1 (en) |
IT (1) | IT1016947B (en) |
NL (1) | NL7409683A (en) |
SE (1) | SE7409471L (en) |
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-
1973
- 1973-07-23 GB GB34993/73A patent/GB1483591A/en not_active Expired
-
1974
- 1974-07-12 CH CH965874A patent/CH604923A5/xx not_active IP Right Cessation
- 1974-07-17 DK DK384574A patent/DK384574A/da not_active Application Discontinuation
- 1974-07-17 NL NL7409683A patent/NL7409683A/en not_active Application Discontinuation
- 1974-07-18 FI FI2194/74A patent/FI219474A/fi unknown
- 1974-07-19 SE SE7409471A patent/SE7409471L/xx unknown
- 1974-07-20 DE DE2435008A patent/DE2435008A1/en not_active Ceased
- 1974-07-22 ES ES428475A patent/ES428475A1/en not_active Expired
- 1974-07-22 BE BE146802A patent/BE817930A/en not_active IP Right Cessation
- 1974-07-22 CA CA205,367A patent/CA1049334A/en not_active Expired
- 1974-07-22 IT IT52219/74A patent/IT1016947B/en active
- 1974-07-23 JP JP49084519A patent/JPS5071583A/ja active Pending
- 1974-07-23 AT AT606874A patent/AT357979B/en active
- 1974-07-23 IE IE1568/74A patent/IE41403B1/en unknown
- 1974-07-23 FR FR7425523A patent/FR2238530B1/fr not_active Expired
- 1974-07-23 AU AU71557/74A patent/AU498649B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
IT1016947B (en) | 1977-06-20 |
ES428475A1 (en) | 1976-12-16 |
AT357979B (en) | 1980-08-11 |
JPS5071583A (en) | 1975-06-13 |
FR2238530A1 (en) | 1975-02-21 |
SE7409471L (en) | 1975-01-24 |
DE2435008A1 (en) | 1975-02-06 |
GB1483591A (en) | 1977-08-24 |
DK384574A (en) | 1975-03-03 |
CA1049334A (en) | 1979-02-27 |
FR2238530B1 (en) | 1979-03-09 |
FI219474A (en) | 1975-01-24 |
CH604923A5 (en) | 1978-09-15 |
NL7409683A (en) | 1975-01-27 |
IE41403L (en) | 1975-01-23 |
AU7155774A (en) | 1976-01-29 |
AU498649B2 (en) | 1979-03-22 |
ATA606874A (en) | 1980-01-15 |
BE817930A (en) | 1975-01-22 |
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