Thermoplastic polyurethane foam, process for production...

Details Thermoplastic polyurethane foam, process for production... Thermoplastic polyurethane foam, process for production...

2005-12-27

2005-12-27

Cooney, Jr., John M. (Department: 1711)

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

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S128000, C521S130000, C521S163000, C521S174000

Reexamination Certificate

active

06979701

ABSTRACT:
The present invention aims to provide a polyurethane foam, suitably usable as a polishing pad, having a uniform foam structure, which can achieve the improvements in the flatness of the surface of polished materials and in the planarization efficiency, and can extend the polishing pad life longer than that of the conventional polyurethane foams. This aim can be achieved by providing a polyurethane foam having a density of 0.5 to 1.0 g/cm3, a cell size of 5 to 200 μm and a hardness [JIS-C hardness] of not less than 90, comprising a thermoplastic polyurethane which is obtained by a reaction of a high polymer polyol, an organic diisocyanate and a chain extender, contains not less than 6% by weight of a nitrogen atom derived from the isocyanate group, and has a storage elastic modulus measured at 50° C. [E′50] of not less than 5×109dyn/cm2.

REFERENCES:
patent: 6239188 (2001-05-01), Kihara et al.
patent: 6777455 (2004-08-01), Seyanagi et al.
patent: 8-113664 (1996-05-01), None
patent: 11-349680 (1999-12-01), None
patent: 2001-261874 (2001-09-01), None

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