Polymethylpentene plastic

TPX Mitsui Petrochemical Industries, Ltd. s tradename for its family of polymethylpentene plastic, tracer A foreign substance, usually radioactive, that is mixed with or attached to plastic material so its distribution or location can later be determined. It is used as a trace chemical to determine behavior of the plastic melt flow through plasticators, molds, and dies. Also called a tracer element or accessory element. See reinforced-plastic prepreg tracer. 

As recently as 1986 almost all addition polymers were excluded from the ranks of engineering plastics. However, progress since then has been made in the development of addition polymeric resins such as polymethylpentene and polycyclopentadiene and its copolymers (see Cyclopentadiene AND DICYCLOPENTAD IENE). 

Fig. 11. Effect of polyolefin primers on bond strength of ethyl cyanoacrylate to plastics. All assemblies tested in accordance with ASTM D 4501 (block shear method). ETFE = ethylene tetrafluoroethylene copolymer LDPE = low-density polyethylene PFA = polyper-fluoroalkoxycthylene PBT = polybutylene terephthalate, PMP = polymethylpentene PPS = polyphenylene sulfide PP = polypropylene PS = polystyrene PTFE = polytetrafluoroethylene PU = polyurethane. From ref. [73].

There are four types of plastic that are commonly used in volumetric ware polypropylene (PP), polymethylpentene (PMP or TPX), polycarbonate (PC), and polystyrene (PS). Plastic can be less expensive than glass, can be more difficult to... 

CAS 6683-19-8 EINECS/ELINCS 229-722-6 Uses Antioxidant, heat stabilizer, color retention aid for plastics (polyethylene, PS, acetal, PVC, methacrylic, PC, polyester, polymethylpentene), rubber (SBR, EPR, EPDM, BR, neoprene, nitrile, IR), latex, varnishes, adhesives, TPR, hot melts Features Low volatility, nonstaining... 

DESIGNING WITH PLASTICS AND COMPOSITES A HANDBOOK POLYMETHYLPENTENE... 

Polyolefins, such as polyethylene, polypropylene, and polymethylpentene, as well as polyformaldehyde and polyether, may be more effectively treated with a sodium dichro-mate- sulfuric acid solution. This treatment oxidizes the surface, allowing better wetting. Activated gas plasma treatment, described in the general section on surface treatments is also an effective treatment for these plastics. Table 7.17 shows the tensile-shear strength of bonded polyethylene pretreated by these various methods. 

Third, contrary to what many processors beUeve, most plastics do not melt in the true sense of the word. Melting rigorously means that energy can be added to a material in order to change its state (solid to fluid) without changing its temperature. This behavior is limited to a few thermoplastic materials, including polyethylenes, polypropylenes, some nylons, the acetals, and thermoplastic polyester (Fig. 10.10). [There are others, such as polyetheretherketone (PEEK) and polymethylpentene, but these are relatively uncommon materi s.]... 

Ohi, H., Mitsui Petrochemical Industries, Ltd., Tokyo, Japan, TPX Polymethylpentene. Modern Plastics Encyclopedia, McGraw-Hill, New York 1995. 

---