Method for making articles by cold compaction molding and...

Details Method for making articles by cold compaction molding and... Method for making articles by cold compaction molding and...

2005-01-25

2005-01-25

Lechert, Jr., Stephen J. (Department: 1732)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S424000, C524S432000, C524S433000, C524S436000, C524S442000, C524S444000, C264S122000, C264S125000, C264S126000

Reexamination Certificate

active

06846869

ABSTRACT:
A method for making an article by cold compaction molding. The method comprises compacting a resin composition comprising high molecular weight and ultra high molecular weight polyethylene (HMW-PE and UHMW-PE, respectively) homopolymer, copolymer, and/or blend and an inorganic acid scavenger at a temperature below the softening temperature of the composition. An article prepared in accordance with the claimed method shows lower corrosion test data compared to articles prepared from virgin HMW-PE and UHMW-PE, and an improved cold compaction strength compared to articles prepared using resins containing metal soaps.

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Yannig Thomas et al., “Effect of Processing Parameters During Warm Compaction and Free Sintering of UHMWPE Powders”, ANTEC Annual Technical Conference, Society of Plastics Engineers, Apr. 1997, Toronto, Canada.
G. W. Halldin and M. R. Shah, “Compaction of Polymer Powders”; ANTEC Annual Technical Conference, Boston, May 1981, pp. 353-355.
G. W. Halldin and I. L. Kamel, “Powder Processing of Ultra-High Molecular Weight Polyethylene. I. Powder Characterization and Compaction”; Polymer Engineering and Science, Jan., 1977, vol. 17, No. 1. p. 21-26.
Kyowa Chemical Industry Co., Ltd. “DHT-4A”; Osaka, Japan.

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