What polymers are used in film coating?

The most widely used polymers in non-functional film coating are cellulose derivatives such as hypromellose. Plasticizers, used to improve the flexibility of the film formed and prevent it from cracking or breaking. They work by weakening the attraction between the polymer molecules to make the film more malleable.

Which ingredients are commonly used as coating agents for film coating?

What is the composition of a typical coating formula?

• Cellulosics, such as hydroxypropyl methyl cellulose (HPMC) , Hydroxypropyl cellulose (HPC), and ethyl cellulose (EC)
• Vinyls, such as polyvinyl alcohol.
• Acrylics, such as methacrylic acid / ethylacrylate copolymers (often used for enteric or delayed release coatings)

Which polymer is used for enteric coating?

Delayed-release (Enteric) Coatings

Why the aqueous coating formulations are preferred for film coating process?

Aqueous film coating: Aqueous coating is a widely used film coating method in current pharmaceutical practice. It has many advantages over organic solvent-based coatings in terms of operator safety, environmental pollution, and risk of explosion.

What is used for enteric coating?

The substances used in enteric coating are hydroxypropyl methylcellulose phthalate (HPMCP), polyvinyl acetate phthalate, diethyl phthalate, and cellulose acetate phthalate. In general, tablets can be coated using either a fluid-bed dryer or air suspension coating.

What is the formulation of enteric-coated capsules?

Enteric coated capsules are capsules that have an acid resistant coating to prevent them from dissolving when they pass through the stomach. The capsules are activated only when they pass through an alkaline environment — that is with a pH factor of 5.5 or higher – which is usually when they reach the small intestine.

Why is diluent used in tablet formulation?

Diluents act as fillers in pharmaceutical tablets to increase weight and improve content uniformity. Natural diluents include starches, hydrolyzed starches, and partially pregelatinized starches. Diluents provide better tablet properties such as improved cohesion or to promote flow.

What is aqueous film coating?

Aqueous film coating is applied as a thin polymeric film to the surface of a tablet. Film coating can protect the tablet from light, temperature and moisture, mask undesirable taste or odour, improve the appearance, provide tablet identity, facilitate swallowing and control or modify the release of the drug.

What is the formulation of enteric coated capsules?

Is omeprazole enteric-coated?

Omeprazole is inactivated by exposure to gastric acid and is formulated as a gelatin capsule containing enteric-coated granules that release the drug in alkaline medium.

What is functional film coating?

Film coating is a common step in tablet manufacture that can be used to improve product appearance, organoleptic properties, or to facilitate swallowing. Functional film coats can also be used as a part of the product’s stabilisation strategy and to modify or delay drug release.

What are the common ingredients used in film coating?

Common ingredients used in many film-coating formulations are: (1) polymer, (2) plasticizer, (3) colorants, and (4) solvent/vehicle. When designing coating formulations, there are several important issues to consider.

Why choose polymers for immediate release coating formulations?

Polymers are selected for their ability to form strong, flexible films, adhere strongly to tablet surfaces, form elegant films, facilitate ease of processing, and permit rapid drug release from dosage forms. Some of the polymers used in immediate-release coating formulations are cellulosic polymers, vinyl alcohol polymers, and acrylic polymers.

What are the functional properties of film coated tablets?

Many film coating materials have functional properties which enable the creation of sustained or delayed (enteric) release dosage forms. Coating solution composition may affect the quality of final coated tablets.