Talc-filled polyolefin

Figure 12.5 Range of particle sizes for talc-filled polyolefin applications [3], (With permission from the publisher.)...

Mica provides better scratch and mar resistance than other minerals. The ability to improve scratch resistance is especially useful for automotive interior applications where scratch and mar resistance has been a problem with talc-filled polyolefins. A considerable amount of research is presently underway to take advantage of this characteristic of mica. 

J.A. Radosta. Impact and flexural modulus behaviour of calcium carbonate and talc filled polyolefins. Proceedings 33 SPE-ANTEC, 525-530, 1975. 

Polyolefins are well adapted to the mono-material concept talc-filled polypropylene and LFRT for structural parts, foamed polyethylene and polypropylene for damping, polypropy-lene/EPDM alloys or copolymers for skins. Some other functions need incompatible polymers with specific characteristics such as optical properties. Without claiming to be exhaustive, the other thermoplastic materials are ... 

The vast majority of polyolefin end-uses are without filler, since they are ine qjensive and of such low density that it has been difficult to produce fillers that are as cheap on a volume replacement basis. The most widely used minerals in filled polyolefins are calcium carbonate and talc. 

The combination of Uvasorb HA88 FD and Uvasorb HA77 DF gives very high light stability to polyolefins tapes and to the talc filled Polypropylene copolymer compounds usually used for automotive applications. 

Effect of talc on mechanical properties of polyolefins fypically depends on particle size of the filler. If is generally considered thaf fhe finer fhe falc particles, the better its effect on impact resistance, which generally suffers with addition of minerals. However, data in Table 4.7 show that it is not always so. Although introduction of talc indeed reduced impact resistance of the filled polypropylene regardless of particle... 

Particulate-filled thermoplastic polyolefins are used in vehicle applications. Talc, calcium carbonate, and kaolin are typical fillers. Fillers do not change the transition characteristics of the plastic. Fillers increase the temperature-dependent elastic moduli of the plastics, increasing the forces required to form the plastics in the plateau-temperature regions. Matched-mold thermoforming is necessary if the product cannot be formed using a conventional pressme box over a single-surface mold. 

Talc has been the second mineral of choice to fill polypropylene. Such applications have usually been automotive and industrial. Talc is a general purpose filler mineral and is highly compatible with polyolefins. It is widely used to increase stiffness and heat resistance in polypropylene automobile trim parts that do not require high reinforcement. 

Uses Coupling agent for glass-, talc-, or calcium carbonate-filled PP. HDPE adhesion promoter pigment dispersant compatiblllzer for nylon/polyolefin blends and nylon-based fluorescent pigments... 

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