Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Starting material is nonhollow planar finite length preform...
Reexamination Certificate
2011-08-09
2011-08-09
Davis, Robert B (Department: 1743)
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Starting material is nonhollow planar finite length preform...
C264S102000, C264S210500, C264S211240, C264S554000
Reexamination Certificate
active
07993569
ABSTRACT:
The present invention provides a method of manufacturing high-melting-tension heat-resistant transparent or opaque sheets, boards, and molds from polyethylene terephthalate (PET). The method is characterized in that a mixture of:(1) PET polyester whose melt flow rate (MFR) is 45-130 g/10 minutes (a);(2) coupling agent master batch (f) comprising coupling agent (d) and substrate (e), wherein coupling agent (d) is a mixture of compounds containing 2 epoxy groups (b) and compounds containing 3 or more epoxy groups (c); and(3) catalyst master batch (i) comprising coupling reaction catalyst (g) and substrate (h);is melted in a reaction-extruder to give PET polyester whose MFR is 40 g/10 minutes or less. The resulting PET polyester is molded into amorphous sheets or boards, and then heated again to a predetermined temperature to give transparent heat-resistant sheets or boards; or then vacuum-, pressure-, or vacuum-pressure-formed following heat-setting to give transparent heat-resistant or white opaque highly-heat-resistant mould articles.
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Fujimaki Takashi
Kobayashi Yukio
Nakamoto Takashi
Davis Robert B
FTEX, Incorporated
Nakamoto Packs Co., Ltd.
Sughrue & Mion, PLLC
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