Novel Film Coating Composition
Related Application
This application is related to Indian Provisional Application 3092/MUM/2011 filed 3 Nov, 2011 and is incorporated herein in its entirety.
Field of Invention
This invention relates to the field of aqueous and non-aqueous film coating of substrates like pharmaceutical tablets, nutritional supplements, food, confectionery items, agricultural seeds, and the like, and is specifically concerned with coating substrates with a coating based on low molecular weight hydroxypropyl methyl cellulose having low viscosity. The invention provides a composition where it provides a relatively faster rate of coating than those known in the prior art.
Background of the Invention
The present disclosure relates to film forming compositions by the use of low molecular weight, low viscosity hydroxypropyl methyl cellulose coating compositions and coating compositions produced therewith.
The present disclosure also relates to method of making ready-mix/pre-mix film forming compositions.
The use of film coating technology has become well established in the pharmaceutical and other industries and has made great advances. Improved production equipment and development of highly efficient film coating formulations and polymers have accelerated the acceptance of film coating technology. Hydroxypropyl methyl cellulose (HPMC) was typically used in film coating formulations as a film forming polymer and remains in common usage. HPMC is obtained through a sumptuous serial procedure. Firstly, cellulose is extracted from either cotton flock or paper pulp and solubilised in sodium hydroxide solutions to obtain swollen cellulose. HPMC is subsequently obtained by treating the swollen cellulose with methyl chloride and propylene oxide. Finally, the mass is dried, comminuted and packaged after removal of dopants. HPMC is typically sold in several grades with different viscosities.
HPMC with viscosity 5 & 15 Cps are frequently used in tablets coating formulation. However, a limitation of the above HPMC polymers is rapid viscosity build upon dissolution in water & other organic solvents. Viscosity should be sufficiently low in order to facilitate atomization. The viscosity is mainly dictated by polymer concentration in the formulation. A lower polymer concentration of above forms lower viscosity, but also leads to relatively long coating times.
The use of Hydroxypropyl methyl cellulose with the short name Hypromellose /HPMC is generally used as a film forming polymer. Hypromellose is soluble in water & other organic solvents or their combinations such as Methylene chloride (MDC), Isopropyl Alcohol (IP A), Methanol, Acetone, Industrial spirit, Absolute alcohol etc. Also the same is stable up to pH 2 to 14 in any above mentioned solvents which emphasizes the use of Hypromellose in earlier mentioned solvents for film coating process. The present invention provides a film forming composition comprising low molecular weight hydroxypropyl methyl cellulose of low viscosity grade less than 3 Cps, where it provides a faster rate of coating.
US 2010/0275814 Al provides a cellulose ether compositions with the use of low molecular weight HPMC. US5248516 relates to the process for making an aqueous dispersion of a dry solid film- forming homogeneous particulate composition containing a film-forming water-soluble polymer, a plasticizer and an optional pigment.
US20060093560 provides a formulation where low molecular weight, water soluble polymer and at least one gum can be dispersed in water, along with other ingredients, at a temperature above the cloud point of the low molecular weight, water soluble polymer, leaving the low molecular weight, water soluble polymer undissolved and the viscosity of the dispersion manageable.
US20100285125 provides a formulation using a combination of low molecular weight polymers along with high molecular weight polymers. US6448323 describes the film forming compositions with the use of Polyvinyl alcohol and other excipients.
Thus, the present composition provides a Novel composition that reduces the coating time and enhances the productivity. Summary of the Invention
The present disclosure is directed to aqueous and non aqueous film forming compositions used in pharmaceutical tablets, nutritional supplements (Nutraceuticals) , food & confectionary items, agricultural seeds & other similar products. The present disclosure is also directed to aqueous film forming compositions used in pharmaceutical tablets, nutritional supplements (Nutraceuticals), food & confectionary items, agricultural seeds & other similar products.
The present disclosure is also directed to non-aqueous film forming compositions used in pharmaceutical tablets, nutritional supplements (Nutraceuticals), food & confectionary items, agricultural seeds & other similar products.
The present disclosure is also directed to methods for producing coating composition.
In one aspect the invention provides a composition with low molecular weight Hydroxypropyl methyl cellulose and/or other polymers, one or more plasticizer, optionally glidant, opacifier, colourants and optionally preservatives, sweeteners and flavours. In second aspect the invention provides a process for preparing the composition which is carried out at 40°C or less.
In third aspect the invention provides a coating compositions with low molecular weight hydroxypropyl methyl cellulose having low viscosity less than 3 Cps, the compositions having a colour acceptable for appearance-sensitive applications. Surprisingly, it has been found that the present invention provides a composition in which coating time is considerably reduced to 2 hours or less, preferably to 1 hour or less and more preferably to 45 minutes or less and most preferably to 20 minutes or less.
Another advantage of the present invention is that it can make the reconstitution of coating formulation upto 20-25% w/w which significantly reduces the coating time about 50 to 60% than the conventional polymer systems.
Another advantage of the present disclosure is the composition is easily sprayable at low atomising pressure than the conventional coating composition. The above summary of the present invention is not intended to describe each disclosed embodiment or every implementation of present invention. The detail description that follows more particularly exemplifies the illustrative embodiments, but should not be construed unduly limit this invention.
Detailed Description of the Invention In accordance with the invention, the inventive film coating composition for use in coating pharmaceutical tablet, nutritional supplement, food, confectionery items , agricultural seed, and the like, comprises 1) low molecular weight, low viscosity Hydroxypropyl methyl cellulose less than 3 Cps, 2) atleast one plasticizer, optionally 3) glidant 4) opacifier, 5) colourants, preservatives, sweeteners and flavours. In accordance with the invention, a method of coating substrates, such as pharmaceutical tablets, nutritional supplements, food, confectionery forms, agricultural seeds, and the like with a film coating, comprises the steps of mixing low molecular weight, low viscosity grade hydroxyproyl methyl cellulose less than 3 Cps, atleast one plasticizer, optionally a opacifier, a glidant and colourants, preservatives, sweetners and flavours. These excipients are blended dry.
In one embodiment, the temperature for coating process is 40°C or less and preferably between 35 to 40° C with the new invention.
In one embodiment, the invention provides a composition for film coating composition for use in coating pharmaceutical tablet, nutritional supplement, food, confectionery forms, agricultural seed, and the like, comprising 1) low molecular weight, low viscosity Hydroxypropyl methyl cellulose less than 3 Cps with single or in the combination of other polymers such as Hydroxy Propyl Methyl Cellulose (5 Cps / 15Cps), Ethyl Cellulose, Hydroxy Propyl Cellulose, Hydroxy Ethyl Cellulose, Polyvinyl Alcohol, Cellulose Acetate Phthalate, Hydroxy Propyl Methyl Cellulose Phthalate, Methacrylic acid co-polymer type B, Methacrylic acid co-polymer type C. with , 2) atleast one plasticizer, & optionally 3) glidant 4) opacifier, 5) optionally colourants, preservatives, sweeteners and flavours where the coating time is considerably reduced.
The viscosity of low molecular weight hydroxypropyl methyl cellulose in the instant invention is less than 3. It has been found that the coating time is considerably reduced to 2 hours or less, preferably to 1 hour or less and more preferably to 45 minutes or less and most preferably to 20 minutes or less with the use of the present composition.
Polymers are not limited to and are selected from group comprising Hydroxy Propyl Methyl Cellulose with viscosity less than 3 to 15 Cps, Ethyl Cellulose, Hydroxy Propyl Cellulose, Hydroxy Ethyl Cellulose, Polyvinyl Alcohol, Cellulose Acetate Phthalate, Hydroxy Propyl Methyl Cellulose Phthalate, Methacrylic acid co-polymer type B, Methacrylic acid copolymer type C.
Plasticizer reduce the glass transition temperature of Hydroxypropyl methyl cellulose, making the film less brittle. These are not limited to and are selected from the group comprising Polyethylene Glycol 400, Polyethylene Glycol 4000, Polyethylene Glycol 6000 , Polyethylene Glycol 8000, Diethyl Phthalate, Propylene Glycol, Castor Oil, Triacetin ,Triethyl Citrate, Glycerin, Polysorbate 20, Polysorbate 40, Polysorbate 60, Polysorbate 80, Cetyl alcohol, sorbitan monooleate, hydrogenated vegetable oil, hydrogenated castor oil, dibutyl phthalate either alone or used in combination.
Glidants are used to improve the smoothness of the final coating. These are not limited to and are selected from the group comprising Talcum, Colloidal Silicon Dioxide, Sodium lauryl sulphate, Magnesium Stearate. Opacifier are not limited to and are selected form the group comprising Talcum, titanium dioxide, lactose, calcium carbonate, heavy magnesium oxide, light magnesium oxide.
Colourants are not limited to and are selected form the group comprising allura red, brilliant blue, carmoisine, erythrosine, indigo carmine, ponceau 4R, quinoline yellow, sunset yellow, tartrazine, quinazarine green SS, alizarin cyanine green F, fast green FCF, eosin YS or eosin, toner red or sudan III, orange G, resorcin brown, naphthol blue black, patent blue, annatto, carotene, chlorophyll, cochineal, curcumin, caramel, riboflavin and oxide colours such as titanium dioxide, black iron oxide, red iron oxide, yellow iron oxide and pearlescent pigment.
Preservatives are not limited to and are selected from group comprising alkyl ester/s of parahydroxy benzoic acid, benzoic acid or it's salts, sorbic acid or it's salts. In yet another embodiment, the invention provides a composition for film coating composition for use in coating pharmaceutical tablet, nutritional supplement, food, confectionery items, agricultural seed, and the like, comprising 1) low molecular weight, low viscosity Hydroxypropyl methyl cellulose less than 3 Cps and optionally other polymers such as Hydroxy Propyl Methyl Cellulose with viscosity less than 3 cps to 15 Cps, Ethyl Cellulose, Hydroxy Propyl Cellulose, Hydroxy Ethyl Cellulose, Polyvinyl Alcohol, Cellulose Acetate Phthalate, Hydroxy Propyl Methyl Cellulose Phthalate, Methacrylic acid co-polymer type B, Methacrylic acid co-polymer type C. 2) atleast one plasticizer, & optionally 3) glidant 4) opacifier, 5) colourants, preservatives, sweeteners and flavours where the reconstitution level is between 20-25 % w/w which subsequently reduces the coating time.
The percentage range of each component of the coating composition of the invention are as follows, by weight:
Sodium Lauryl Sulphate
A Opacifier 0 TO 65 0 TO 55
Titanium Dioxide
Calcium Carbonate
Heavy Magnesium oxide
Light Magnesium Oxide
The colourants (optionally) Q.S Q.S
Iron oxides
Aluminium Lake of food colours
Natural colours ,water soluble colours
The Organoleptic ingredients Q.S Q.S
(optionally)
Preservatives, Sweeteners, Flavours
The present invention will hereinafter be described in more detail with respect to following working examples, but the present invention is by no means limited to specific working examples, which may be properly changed or modified.
Examples Example 1:
Composition Percentage
Low molecular weight HPMC less than 4 Cps 50.0 to 60.0
Polyethylene Glycol 400 05.0 to 10.0
Titanium Dioxide 20.0 to 30.0
Talcum 08 to!5.0
Example 2:
Composition Percentage
Low molecular weight HPMC less than 4 Cps 55.0 to 60.0 Diethyl Phthalate 07.0 to 15.0 Titanium Dioxide 10.0 to 20.0 Talcum 05.0 to 12.0
Lake Tartrazine 02.0 to 06.0
Lake Brilliant Blue 01.5 to 03.0
Qty of coating Reconstitution Weight gain Time material achieved Required for coating
With 3% theoretical Reconstitution Level: 20.0 %. 2.1 % 1 hours weight gain w/w
Example 3;
Composition Percentage
Hypromellose 5CPS 50-60
Polyethylene Glycol 400 05-10
Polyethylene Glycol 6000 08-15
Titanium Dioxide 25-30
Lake Quinoline Yellow 0.1- 0.35
Yellow Iron Oxide 0.3-0.75
Example 4:
Composition Percentage
Low molecular weight HPMC less than 4 Cps 50.0 to 57.0
Polyethylene Glycol 400 05.0 to 13.0
Polyethylene Glycol 6000 08.0 to 15.0
Titanium Dioxide 20.0 to 30.0
Lake Quinoline Yellow 0.05 to 1.0
Yellow Iron Oxide 0.05 to 1.5 Qty of coating Reconstitution Weight gain Time
material achieved Required
for coating
5% weight gain Reconstitution Level: 2.1% further coated with 25 min for 2.1%
23.0 %. w/w weight gain up to 4.2 % weight gain, 40
min for 4.2% weight gain
Example 5:
Composition Percentage
Low molecular weight HPMC less than 4 Cps 55.0 to 65.0
Triethyl Citrate 07.0 to 13.0
Titanium Dioxide 15.0 to 25.0
Lake Erythrosine 05.0 to 15.0
Qty of coating Reconstitution Weight gain Time
material achieved Required
for coating
With 6.5% theoretical Reconstitution Level: 22 .0%. 2.1% further coated with 25 min for 2.1% weight gain w/w weight gain up to 4.2 % & weight gain, 40 min
5.4% for 4.2% weight gain
& lhour for 5.4 % weight gain
Example 6:
Composition Percentage
Low molecular weight HPMC less than 4 Cps 55.0 to 65.0
Triethyl Citrate 10.0 to 18.0
Titanium Dioxide 15.0 to 25.0
Lake Erythrosine 07.0 to 13.0
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