Slip Masterbatch consists of a concentrated mixture of pigments and/or encapsulated additives manufactured by heating a carrier resin and then cooling it and cutting it into granules. The masterbatch thus allows the transformer to colour and give characteristics to the natural polymer economically in the plastics transformation process.
The masterbatch carrier must be identical/compatible with the polymer. For example, EVA or LDPE is a compatible carrier with polyolefins and nylon, as is polystyrene with ABS, SAN and sometimes polycarbonates.
In this sense, when the masterbatch carrier is incompatible with the raw material, changes may occur in the properties of the processed material. The processor must specify the characteristics of the raw material. The percentage of use of masterbatches in relation to the raw material is between 1 and 5 %. Colour and additive masterbatches can be combined.
Masterbatches are compatible with most processes, with the exception of rotational moulding, plastisol and other liquid resin systems.
The processing of plastics films will be disturbed by a high Coefficient of Friction. This tendency to adhere to metal surfaces and to other film surfaces will be a limiting factor for high speed processing applications as packaging, handling of films, etc…
Slip additives are added to reduce the surface coefficient of friction of polymers and are used to enhance either processing or end applications. Typically slip additives have a low compatibility with the polymer which allow migration to the film surface. A good control of the compatibility controls the migration speed and thus the speed of acting performance can be engineered.