| 摘要 |
The invention relates to a layered profile thermoplastic extrusion. The profile of the invention comprises a thermoplastic composite core having an exterior layer comprising a material resistant to the damaging effects of the environment. The core comprises a thermoplastic polymer and an effective amount, to improve structural properties, of a cellulosic fiber. The exterior layer comprises a blend of a thermoplastic polyvinyl chloride polymer composition and an effective structural and stabilizing amount of a polyvinylidene chloride polymer composition. The exterior layer can also comprise standard pigments, dyes and other process aids to produce an extruded exterior layer on the thermoplastic profile. The resulting profile comprising the core and exterior layer can be used as a high strength structural member in the manufacture of consumer and construction grade windows and doors. The exterior layer is uniquely resistant to the undesirable effects of sunlight, pollution, rain, wind and snow, freeze-thaw cycles and other harsh aspects of the environment.
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