Technical facts about color masterbatches

Since their introduction in the 1960s the color masterbatches has steadily penetrated the traditional colored compound market. It is a solid concentrate of color and/or performance enhancing additives such as anti-static, UV stabiliser, metal deactivator, etc., that is added to a base polymer to impart these attributes. It is usually supplied in granular form, either as pellets similar in size to most polymers or as miniature pellets, known as micro granules. Alternatively, they can be delivered in 'rough cut' form - a mixture of small shreds and chunks.

Two main types are offered - polymer specific and universal. Polymer specific masterbatch is produced using the same base polymer group. Universal they employs a carrier system that is capable of carrying the high quantities of additives necessary to deliver the end use properties required as well as affording the essential compatibility required across a broad range of polymers.

Universal ones are normally readily available from stock, in small quantities and are cost effective if used correctly. However, in terms of compatibility, they are a compromise and processing difficulties can arise with some materials and engineering polymers that may have to be pre-dried. They are not recommended for use at high dosage levels as the appearance or physical properties of the final product may be adversely affected.

Conversely, polymer specific masterbatch, which can be pre-dried with the host polymer, may be added at high loading without compatibility problems. However, only a limited range of colors is generally available and not all engineering polymers lend themselves to conversion to them offered by the masterbatch producers.

Their formulations normally include:
·         Pigment - up to 65 per cent
·         Polymer carrier - 35 to 50 per cent
·         Dispersing aids (waxes/stearates etc) - up to 10 per cent

·         Inorganic filler

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