Coefficient of friction reduction of films also provides anti-block & mold release improvement.
|Astra Product Code||Astra Internal Reference Description|
|A-3250||PE Slip additive Masterbatch|
|A-3300||PE Slip additive Masterbatch|
|A-3315||PP BOPP Slip additive Masterbatch|
|A-3316||PP BOPP Slip additive Masterbatch|
Slip additives are added to reduce the surface coefficient of friction of polymers and are used to enhance either processing or end applications.
High and low level slip additives are available and immediate and slow acting performance can be engineered into the masterbatch.
Food contact approved grades are available.Combinations with antistatic and antiblock products for use in the film industry offer cost effective, multi-use masterbatches. Application Examples Film, sheet, injection moulding and others.
Slip & Antiblock Products
- Full range of products for the extrusion industry
- Grades formulated for high transparency applications
- Cost effective, highly concentrated systems available.
Types of Slip Additive
The most commonly used slip additives are erucamide (C-22) and oleamide (C-18). Oleamide migrates quicker than erucamide and is often called "fast blooming". However after a certain time the slower erucamide will provide films with a lower COF than oleamide. Erucamide, with its lower vapour pressure and volatility, is used in higher temperature processing applications and it also stays at the surface longer, not venting off as smoke. Oleamide is used where a low COF is needed in a short period of time, while the slower migration of erucamide can be advantageous in roll stock applications and on-line corona treatment. Another fatty acid amide is Stearamide. This is often used together with erucamide or oleamide to provide an anti-blocking effect when film transparency is very important.
The concentration of slip present affects performance. Initially the COF is sensitive to small variations in concentration until a critical level of slip is reached, after which further slip has little effect on the COF. The amount of slip required depends upon film thickness, the slip additive being used and the presence of other additives such as anti-blocks.