Polycarbonate for making extruded films that are virtually...

Details Polycarbonate for making extruded films that are virtually... Polycarbonate for making extruded films that are virtually...

2007-10-25

2011-12-27

Boykin, Terressa (Department: 1765)

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C524S115000, C524S387000, C524S413000, C524S437000, C525S067000, C525S418000, C525S439000, C525S462000, C528S198000

Reexamination Certificate

active

08084570

ABSTRACT:
Linear polycarbonate resin virtually free of surface defects that impair the suitability of the resin for demanding optical application is disclosed. Also disclosed is a process for the manufacture of the resin. The surface defects included in the resin are in the form of transparent fluorescing particles, the particle count of which portion that are 15 and 250 μm in size, is up to 1.8 counts/g, said count being determined by exciting the residue remaining after filtering a solution of said polycarbonate in methylene chloride through a Teflon filter of 5 μm pore size at a wavelength of 400-440 nm, 25× overall magnification and illumination time of 40 millisec. The polycarbonate is suitable for making films of improved optical properties.

REFERENCES:
patent: 6288204 (2001-09-01), Ogawa et al.
patent: 6720406 (2004-04-01), Elsner et al.
patent: 6815524 (2004-11-01), Bödiger et al.
patent: 2005/0043500 (2005-02-01), Bodiger et al.
patent: 08109252 (1996-04-01), None
patent: 2003-231141 (2003-08-01), None
patent: 2005082647 (2005-03-01), None
patent: WO 0190215 (2001-11-01), None
International Search Report and Written Opinion mailed Apr. 2, 2008.

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