Stock material or miscellaneous articles – Structurally defined web or sheet – Physical dimension specified
Reexamination Certificate
2004-05-12
2009-12-08
Sample, David R (Department: 1794)
Stock material or miscellaneous articles
Structurally defined web or sheet
Physical dimension specified
C428S323000, C428S327000, C428S330000, C428S500000, C359S443000, C359S448000, C359S460000, C359S601000, C525S305000, C156S244110
Reexamination Certificate
active
07629041
ABSTRACT:
The present invention relates to diffuser sheets for LCD applications encompassing at least one light-scattering polymethyl methacrylate layer which comprises a polymethyl methacrylate matrix and also from 0.5 to 59.5% by weight, based on the weight of the light-scattering polymethyl methacrylate layer, of spherical scattering particles (A) whose median size V50is in the range from 0.1 to 40 μm, and whose refractive index differs from that of the polymethyl methacrylate matrix by a value in the range from 0.02 to 0.2, and from 0.5 to 59.5% by weight, based on the weight of the light-scattering polymethyl methacrylate layer, of spherical particles (B) whose median size V50is in the range from 10 to 150 μm and whose refractive index differs from that of the polymethyl methacrylate matrix by a value in the range from 0 to 0.2, where the total concentration of the spherical scattering particles (A) and particles (B) is in the range from 1 to 60% by weight, based on the weight of the light-scattering polymethyl methacrylate layer, and the spherical scattering particles (A) and spherical particles (B) have a different median particle size V50, where the transmittance of the diffuser sheets is in the range from 20 to 70% and their scattering power is greater than 0.3, where the ratio of the square of average surface roughness of the polymethyl methacrylate layer RZto the third power of the size of the spherical particles (B) RZ2/DPB3is in the range from 0.0002 to 0.1300 μm−1.
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Groothues Herbert
Parusel Markus
Schmidt Jann
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Sample David R
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