Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Reexamination Certificate
2007-02-27
2007-02-27
Kuhns, Allan R. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
C264S045100, C264S051000
Reexamination Certificate
active
10502934
ABSTRACT:
A composite foamed polypropylene resin molding including a plurality of sections which are fuse-bonded to each other, at least two of which differ from each other in color, apparent density, composition and/or mechanical strengths, each of which is formed from expanded polypropylene resin beads, and each of which shows a high temperature endothermic peak in a DSC curve thereof. At least one of the sections satisfies conditions (d) to (f) at the same time: (d) to be formed from specific expanded polypropylene resin beads of a base resin having a tensile modulus of at least 1,200 MPa, (e) to have an apparent density D2of 10–500 g/L, and (f) to have such a high temperature endothermic peak with a calorific of E2J/g, wherein D2and E2have the relationship 20−0.020×D2≦E2≦65−0.100×D2.The composite molding may be prepared by filling expanded polypropylene resin beads in each of a plurality of contiguous spaces defined in a mold cavity and heating the expanded beads to fuse-bond respective expanded beads together into a unitary body. At least one of the spaces is filled with the specific expanded polypropylene resin beads.
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Hashimoto Keiichi
Hira Akinobu
Sasaki Hidehiro
Bacon & Thomas PLLC
JSP Corporation
Kuhns Allan R.
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