What is blocking in polymer films?
Blocking in polymer films describes the adhesion of two polymer surfaces to one another, resulting in difficulty in separately the films. Block is related to slip, however, slip involves the surfaces sliding over each other.
Anti-blocking additives reduce blocking at the surface of polymer films and other plastic articles to allow easier processing and handling. Traditional inorganic anti-blocking additives, such as silica or talc, work by reducing polymer to polymer contact and micro-roughening of the surface. Our organic additives reduce surface friction allowing easier separation of polymer surfaces.
Why use Croda’s anti-blocking additives?
Traditional, inorganic anti-blocks such as silica and talc can cause a reduction of clarity in transparent films. Croda’s anti-blocking additives work best in combination with low levels of inorganic anti-block, which results in improved clarity, reduced blocking and easier separation of polymer films.
Key benefits of our anti-block additives
- High film clarity
- Low use levels
- Slipping or non-slipping solutions
- Synergy with inorganic anti-block additives
We offer many bio-based anti-blocking additives suitable for use in bio-based polymers.
Our anti-blocking additives are ideal for use in film production to stop unwanted blocking in production, conversion and end-use. They work well in combination with inorganic anti-blocking additives to minimise any impact on clarity.
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