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...
Reexamination Certificate
2005-03-15
2005-03-15
Wu, David W. (Department: 1713)
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...
C524S442000, C524S445000, C524S447000, C525S241000, C525S219000
Reexamination Certificate
active
06867255
ABSTRACT:
A nanocomposite made with an inorganic layered material and a star-shaped polystyrene that can be blended with normal linear polystyrene is disclosed. The inorganic layered material can have an exfoliated structure, substantially exfoliated, or intercalated structure. The exfoliated structure can result in significantly improved physical properties, even with only a very low content of clay. The invention is also directed to a process that can be used to make the compositions of the present invention. In one embodiment, a physical mixture of clay and star polymer is prepared and then the mixture is heated for several hours, preferably under high-shear mixing, to increase the rate of exfoliation, after which mostly inexpensive commodity linear polystyrene polymer completes the composition.
REFERENCES:
patent: 6451897 (2002-09-01), Niyogi
patent: 9907790 (1999-02-01), None
patent: 03016392 (2003-02-01), None
Balazs et al. Polym. Int., 2000, 49, 469-471.*
Richard A. Vaia et al; “Synthesis And Properties Of Tow-Dimensional Nanostructures By Direct Intercalation Of Polymer Melts In Layered Silicates”; Chemistry Of Materials; American, American Chemical Society, Washington, US; vol. 120; No. 2; 1993; pp. 1694-1696.
Chandralekha Singh & Anna C. Balazs*, Effect of polymer architecture on the miscibility of polymer clay mixtures, Acc. Chem. Res. 1999, 32, 651; Polymer International 49:469-471 (2000).
Barnes Craig L.
Blanton Thomas N.
Robello Douglas R.
Yamaguchi Nori
Eastman Kodak Company
Konkol Chris P.
Lee Rip A
Wu David W.
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