IMERYS is a major supplier of high quality mineral additives to the polymer and rubber industries throughout the world.
Our mineral processing expertise allows us to offer innovative mineral additive solutions to match the requirements of your polymer and rubber applications.
All of our products are supported by a high standard of technical service, product development and research from a team of highly experienced scientists and specialists in the application of DE and perlite in these industries.
Imerys diatomaceous earth grades provide a unique balance between blocking, re-blocking, haze, clarity and mechanical properties of plastic films made from LDPE, HDPE, PET and PP.
Plastic film blocking is a common occurrence during film production, converting and end use. It results in the adhesion of adjacent film layers to each other rendering their separation difficult.
Polyethylene (PE) is one of the most widely used polymers and PE films are the most common in packaging applications. PE is relatively easy to process although thin films do have a tendency to stick to each other when pressed tightly together or wound onto a core.
This tendency to block increases with the presence of low molecular weight molecules on the surface of the film. Temperature, film winding pressure, and smoothness of the film surface also play a part.
Bright, finely ground minerals with an irregular particle shape are commonly used as anti-block additives to reduce blocking force, a measure of film-to-film adhesion.
Anti-block minerals work by generating a micro-roughness that limits the contact between adjacent film surfaces, thereby reducing blocking force. Anti-block minerals must also provide a good overall balance of optical and mechanical film properties. Other important properties are lowest possible plastic additives adsorption on the mineral surface, low hardness and low yellow index.
For high transparency films, the mineral’s refractive index must closely match that of the polymer and particle size distribution is also key in minimising light scattering.
Imerys minerals also reduce plastic odor and VOC emission rates, improving interior and automotive air quality.
To find out how our products can help your products and processes please contact us