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A new
polymer specific colour masterbatch for rigid PVC, which allows
it to be coloured as easily as any other plastic material has enormous
potential for the PVC processing market. Until now the PVC masterbatches
have worked well in flexible grades of the material, but have suffered
compatability and homogenisation problems when used to add colour
to rigid PVC, with adverse effects on its physical properties. However,
by using a new formulation, together with specially modified production
plant, the company has introduced Vynacol, a free flowing granular
product which overcomes these problems, enabling processors to enjoy
the benefits of lower polymer costs, reduced stock holding and the
production flexibility offered through using masterbatches. Vynacol
can easily be dispersed at a recommended dosage of between 1 and
2%, when used with filled or unfilled grades. Overdosing at rates
of up to 5% is possible with no effects on processing or physical
properties, and it contains additives which can actually improve
and enhance the characteristics of the base PVC. Ease of processing,
improved weld strength, increases ductility and impact strength
(especially at low temperatures) plus a high gloss finish are all
benefits resulting from using the new material. Ingredients have
been selected for good weatherability and excellent colour aging
characteristics, and UV stabilisers and absorbers can be added,
while suitable approved pigments allow Vynacol to meet all European
food contact, packaging and EN71 (toy) criteria. |
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