Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2007-01-30
2007-01-30
Rabago, Roberto (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C526S348100, C526S351000, C264S176100, C264S17800F, C264S211200, C264S211120, C264S216000
Reexamination Certificate
active
10496789
ABSTRACT:
An apparatus (1) for producing a transparent polypropylene sheet, which comprises a sheet formation means (11) for melt-kneading a resin composition comprising (A) 60 to 97 mass % of a polypropylene resin having an iostactic pentad proportion of 0.85 to 0.99 and a melt index of 2 to 10 g/10 min and (B) 40 to 3 mass % of a polypropylene resin having a racemic pentad proportion [rrrr/(1-mmmm)] of 0.15 to 0.50 and a melt index of 2 to 10 g/10 min and extruding it into s sheet, a first cooling means (12) for cooling a sheet (20) into a solid, a preheating means (13) for re-heating the cooled sheet (20), a heat treatment means (14) for heat-treating the sheet (20) into a sheet (21) and a second cooling means (15) for cooling the sheet (21) after heat treatment.
REFERENCES:
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Funaki Akira
Kubo Masahiro
Uchiyama Katsumi
Yamaguchi Shigeki
Idemitsu Unitech Co., Ltd.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Rabago Roberto
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