Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Reexamination Certificate
2007-01-09
2007-01-09
Zemel, Irina S. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
C521S079000, C521S080000, C521S081000, C264S045300, C264S045900, C264S046100, C264S052000, C264S053000
Reexamination Certificate
active
10075528
ABSTRACT:
U.S. Pat. No. 6,232,354 issued May 15, 2001 describes an environmentally friendly and commercially practicable process for the production of microcellular polymer foams from amorphous, semi-crystalline and crystalline polymers which involves consolidating the polymer, saturating the polymer with an inert gas at elevated temperature and under elevated pressure, and controllably cooling, i.e. quenching the saturated polymer under a variety of temperature and pressure conditions to produce either a closed or open celled microcellular foam or a high density microcellular foam. It has now been discovered that a process similar to that described in this patent can be used for the production of nanocomposite and molecular-composite foams that exhibit exceptional physical properties.
REFERENCES:
patent: 5851617 (1998-12-01), Keiser
patent: 6232354 (2001-05-01), Tan
patent: 92/17533 (1992-10-01), None
Han, X. et al., Influences of Solubility and Viscosity in the Polystyrene/COS Microcellular Foaming Extrusion, Annu. Tech. Conf.—Soc. Plast. Eng., 58.sup.th (vol. 2), 2 1857 (2000).
Nam, P. et al., Foam Processing and Cellular Structure of PP/Clay Nanocomposites, Proceedings of the First World Conference on Nanocomposites, Chicago, IL (2001).
Wrigt Materials Research Co
Zemel Irina S.
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