Polybutylene terephthalate (PBT) is a plastic that is used as an insulator in the electrical and electronics industries. It is a thermoplastic crystalline polymer, and a type of polyester. PBT is resistant to solvents, shrinks very little during forming, is mechanically strong, heat-resistant up to 150°C (or 200°C with glass-fibre reinforcement) and can be treated with flame retardants to make it noncombustible. This article or section does not cite any references or sources. ... This article or section is in need of attention from an expert on the subject. ... Lightning strikes during a night-time thunderstorm. ... Electronics is the study of the flow of charge through various materials and devices such as, semiconductors, resistors, inductors, capacitors, nano-structures, and vacuum tubes. ... A thermoplastic is a material that is plastic or deformable, melts to a liquid when heated and freezes to a brittle, glassy state when cooled sufficiently. ... A polymer is a substance composed of molecules with large molecular mass composed of repeating structural units, or monomers, connected by covalent chemical bonds. ... SEM picture of a bend in a high surface area polyester fiber with a seven-lobed cross section Polyester is a category of polymers, or, more specifically condensation polymers, which contain the ester functional group in their main chain. ... Bundle of fiberglass Fiberglass or glassfibre is material made from extremely fine fibers of glass. ... Flame retardants are materials that inhibit or resist the spread of fire. ...
Preferably, the self-extinguishing polybutyleneterephthalate moldings are manufactured by mixing granular polybutyleneterephthalate with the additives mentioned, subsequently melting and homogenizing the mixture in an extruder, extruding it into a water bath, and granulating and drying it.
A mixture of 3.5 kg of polybutyleneterephthalate granules, 437 g of an adduct of hexachlorocyclopentadiene and cyclooctadiene-1,5, 245 g of antimony trioxide and 262 g of chrysotile containing 40.1% SiO.sub.2 and 40.8% MgO was extruded and used to injection-mold test bars, as described in Example 1.
A mixture of 3.5 kg of polybutyleneterephthalate, relative viscosity = 1.65, 420 g of octabromodphenyl ether, 175 of antimony trioxide and 175 g of chrysotile (composition as in Example 1) was extruded and used to injection-mold test specimens.
Melt blown bicomponent fibers comprising a sheath of polyethylene terephthalate or a copolymer thereof and a core of nylon 6,6 and a reservoir or a nib in a writing or marking instrument comprising a porous element formed from such fibers bonded to each other at spaced points of contact.
As defined in the '766 patent, the term "polyethylene terephthalate or a copolymer thereof" refers to a homopolymer of polyethylene terephthalate or a copolymer thereof having a melting point which is higher than the melting point of the thermoplastic core material in the bicomponent fiber.
It is believed that polyethylene terephthalate and its copolymer of a broad range of intrinsic viscosities are useful according to this invention, although those with lower intrinsic viscosities are preferred.
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