FIBER REINFORCED POLYESTER COMPOSITION
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United States of America Patent
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Issued Date -
Dec 8, 2011
app pub date -
Feb 16, 2010
filing date -
Feb 20, 2009
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Abandoned
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Abstract
The present invention relates to a process for the production of a solid state post condensated fiber reinforced polymer composition, preferably suitable for a brake booster, comprising the steps of: i) compounding a polymer composition comprising: (A) polyethylene terephthalate (PET) and/or polybutylene terephthalate (PBT) with a Mz/Mw<6.0, relative solution viscosity (RSV) of PET of less than 1.70 (determined by diluting 1 gram of polymer in 125 grams of solvent at 25° C., the solvent consisting of 7.2 parts by weight 2,4,6 trichlorophenol and 10 parts by weight phenol), and relative viscosity for PBT of less than 1.90, (determined by diluting 1 gram of PBT in 100 gr metacresol at 25° C.). (B) reinforcing fibers; and ii) heating the compounded polymer composition obtained in step i) under solid phase condensation conditions, thereby increasing the RSV of the PET to at least 1.70 and the RSV of the PBT to at least 1.90, while maintaining the ratio of z-average molecular mass to weight average molecular mass (Mz/Mw) of the solid state post PET and/or PBT substantially the same as the PET and/or PBT used for step i).
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