Antiblocking production

PolyBloc Antiblock Talc, Antiblock product. Specialty Minerals Inc. 

While pure erucamide does not exhibit absorption in the 250-280 nm range all commercial products showed UV absorption maxima at 230, 257, 267 and 278 nm (with variable intensities), indicative of the presence of oxidation products (up to 8 wt%) as impurities with chromophoric groups. Colourless impurities do not have an interference effect. 1JV/VIS was also used to evaluate discoloration of 50wt/wt% mixtures of commercial erucamide and inorganic antiblock agents [59]. Apart from the interference by impurities from solvents chemical methods suffer from lengthy procedures. 

Intermaterial competition affects the additive business. For example, if metallocene polyolefins displace PVC markets, then the demand for heat stabilisers and plasticisers might decrease, while the need for products such as fluoropolymer processing aids, antiblocks and slip additives might increase. At present, PVC as the main user of additives is under threat as never before. However, green PVC, containing more environmentally friendly FRs and plasticisers as well as non-heavy-metal stabilisers, is now environmentally acceptable. 

There are at least five types of synthetic silicas that can be considered for use in polymers. These are generally known as fumed, arc, fused, gel and precipitated. A detailed review of their production and uses has been given by Watson [96]. The types most often encountered in thermoplastics are the gel and precipitated silicas which are frequently used as antiblocking agents in polymer films and as gloss reducing agents in polymer sheets. 

MAJOR PRODUCT APPLICATIONS paints, coatings, rubber, abrasive polishes, cleaning waxes, seed coatings, anticaking agent, antiblock applications, pesticide formulations, asphalt extender, automotive windshields, catalyst support, concrete additive, dental molds, drilling mud, filter papers and pads, specialty p ers, paperboard, foundry, waste disposal aids, stucco, battery boxes, plastic film... 

Octadecenamide, N,N -1,2-ethanediylbis-. (9Z,9 Z)- Oleamide, N,N -ethylenebis- (8CI) Oleic acid-ethylenediamine condensate. Lubricant, slip, antiblock, and mold release agent for plastics, crayons, petrol, products, asphalts, inks, metals, textiles mold release agent for thermoplastic resins in injection molding defoamer and water repellent in industrial/household Solid mp = 115-118 . CK KWfco Chem. Corp. 

Any additive is a potential source of change to the overall processability from pellet feed to melt rheology. The not uncommon operator comment that one particular color always runs well and another always causes problems is more likely to be fact than superstition. Many products are colored by using masterbatches. whilst extruded products may contain antiblock and slip additives. Injection moldings may contain lubricants to aid mold release or provide product lubrication, e,g., bottle caps. In many cases such nias-terbatches contain low-viscosity polymer waxes to promote additive dispersion (particularly pigments) and masterbatch distribution throughout the natural polymer. There are in fact many additives, including fillers, flame retardants, and antioxidants, that can influence processability. 

Antiblocking, matting and texturing properties are obtained by introduction of irregularities. Particles, which are firmly embedded in the product, cause small elevations at the surface. Small amounts of Vinnolit pol5miers (K and C) produce matting and antiblocking effects. 

Luzenac talcs for PE antiblocking, supplier product guide (POL T GB 32 07). RioTinto Minerals. 

Slip, antislip, and antiblock agents [30, 31] do not facilitate molding or semifinished product manufacture as do lubricants. What they do is to simplify further processing - of foils in particular. Foil bags that have been stored in stacks cannot be readily picked up or opened, problems that are particularly noted with LDPE and PP. An effective slip agent with LDPE is addition of 0.05 % oleic acid amide and with PP the same amount of eruca acid amide. Additive manufacturers supply concentrates of these compounds in granulate form for addition to molding compounds [50]. 

Chem. Descrip. 100% Synthetic micronized wax blend CAS 8002-74-2 EINECS/ELINCS 232-315-6 Uses Surf, conditioner, abrasion resist, aid, antiblocking agent, slip agent, mar resist, aid for waterborne or solvent-borne coatings, wood furniture coatings, inks, overprint varnishes, food-contact coatings Features Exc. slip and product release Regulatory FDA 21 CFR 175.300... 

Blocking is the term used for the tendency of two pieces of film to stick together, such as after the two sides of a blown film bubble are pressed together through the nip rollers. Blocking in films can lead to difficulties in handling and conversion or can simply bean inconvenience to customers. Many processors use an antiblock additive during blown film production to minimize this tendency. 

In general, small particle size antiblocks are preferred for thin films (20-30pm), while coarse particles are employed for thick films (>30(im). Agglomerates of antiblocks reduce the antiblocking performance [61]. The selection of the appropriate antiblock depends on the polymer type and the quality requirements of the final film product. 

The suppliers of inorganic additives to the plastics industry market their products primarily as fillers and extenders. While many of these products can also be used as antiblocking agents in polyethylene films, only a few suppliers actively market their products for this end use. 

The preferred particle size for antiblocking agents is closely related to film thickness, e.g., the mean particle size for antiblocks in LLDPE is roughly 12% of the film thickness. Particle size distributions are usually deliberately narrow, because a few larger particles can cause problems, including haze. Some commercial products have bimodal particle size distributions, or they could contain two antiblocking constituents with different mean sizes. 

Techmer PM markets what is described as a superclear formulation of its antiblocking agent Techsperse PM11840E4 for extruded films, bags and pouches of exceptional clarity. The additive has FDA approval for food and medical product use. It is supplied in a polyolefin carrier resin and can be processed at temperatures up to 221 °C. 

Kaolin or china clay, like many minerals, is used much more widely outside the plastics industry than within it, especially in the paper industry but also to a lesser extent in paint, rubber and pharmaceuticals. It is currently used to improve the electrical properties of PVC wire and cable insulation. Other applications are in automotive parts and as an antiblocking agent in plastic films. It can benefit thixotropy, and calcined kaolin can improve dimensional stability. (Calcined kaolin is also competing with silica in the antiblocking agent market.) Polarite 102A from Imerys is an example of a premium kaolin product, targeted at polyamide automotive applications. 

The fatty amides used in PE production include erucamide (EA) cis-13-docosenoic acid, amide), behenamide (docosenoic acid, amide), oleamide (OA) and stearamide (SA) [43]. Unsaturated amides, such as EA and OA, provide superior slip properties, whereas saturated amides, such as behenamide and SA, provide acceptable slip and superior antiblocking properties. EA displaced OA as the preferred slip agent for the production of PO film because it melts at a higher temperature and is more stable at extrusion temperatures EA can be used as a slip and antiblock agent [45]. SA also provides useful slip properties, although it is slower acting it has superior antiblock properties to those of EA and OA. 

---