Slip and Antiblock Agents

Both Toshiba and General Electric market solid spherical silicone powders that are reported to have combined antiblocking and slip agent properties, distributing evenly on film surfaces and reducing friction between film layers, without detracting from film clarity. 

Antiblock and slip agents can be incorporated together using combination master batches which give the film extruder greater formulation control. 

Because of the different chemical composition of antiblocking and slip agents, few companies are involved in both. Table 4.2 presents a list of the selected global suppliers of antiblocking and slip agents. 

TABLE 4.2 Selected Suppliers of Antiblocking and Slip Agents... 

In the previous edition, antiblocking and antislip agents were bracketed with lubricants, and clarifiers were classified as modifiers. All these categories except slip agents have now been given separate headings. 

The above shows that the modem machinery gradually being introduced after the Second World War influenced a search for additives which may contribute to more efficient production and better quality of materials. Antiblocking, release, and slip agents are very recent additions to formulations of plastics but very important for today s technology. 

Table 1.2. Chemical composition of antiblock, release, and slip agents...

The details regarding chemical structure, application form, method of application, and use of individual products for different polymers, products, and processing methods are given in the Database of Antiblocking, Release, and Slip Agents, which constitutes a separate publication on CD-ROM. Various aspects of these additives are discussed in separate chapters in a generalized form. 

Material safety data sheets should list information which permits proper classification of material. A broad range of transportation data for specific materials is included in the Database of Antiblocking, Release, and Slip Agents. Transportation information in the database includes UN Risk Phrases, UN Safety Phrases, DOT Hazard Class, UN/NA, ADR/RID Class, ICAO/IATA Class, and IMDG Class which are required for transportation by air, water and land. 

Wypych, A., Database of Antiblocking, Release, and Slip Agents. ChemTec Publishing, Toronto 2005. 

In summary, organic antiblocking, release, and slip agents all benefit from incompatibihty with matrix polymer. Only in some applications of release agents, it may be necessary to review this statement, if the presence of release agent on the surface affects further use or processing properties of the formed part. 

If observations show that tensile strength is decreased, because of addition of antiblocking or slip agent, it suggests that the additive is soluble in polymer and interferes with its crystal-Uzation or affects crystalline region. If the elongation is increased, it most likely means that the additive that causes this increase acts as a plasticizer. 

Acrylic polymers, which form a very large group of diverse materials that may be processed by the majority of polymer processing technologies, are used in many finished products. Antiblocking, release, and slip agents play essential roles in... 

Similar to Chapter 11, the consistent breakdown of information is used to discuss antiblocking, release, and slip agents in various groups of products. Depending on the available information data are allocated to one of five sections T es and concentrations, reasons for use, advantages and disadvantage of additive use, effect on product properties, and examples of formulations. The discussion includes 29 groups of products. 

Uses of antiblocking agents and slip agents " in pol5uner films are the most prominent directions of research on these additives. 

The environmental, health, and safety impact of antiblocking, release, and slip agents follows the breakdown of generic t3 es of additives as used in Chapter 2. The generic materials used in preparation of antiblocking, release, and slip agents are not known to be very toxic, therefore only the most essential characteristics are given. 

This chapter contains information on regulations which are relevant for antiblocking, release, and slip agents use. Some relevant properties are also illustrated with data characterizing the severity of their influence on health and safety. The following effects are considered ... 

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