发明授权
US07629041B2 Diffuser disk for LCD applications, method for the production and use thereof
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用于LCD应用的扩散盘,用于生产和使用它的方法
- 专利标题: Diffuser disk for LCD applications, method for the production and use thereof
- 专利标题(中): 用于LCD应用的扩散盘,用于生产和使用它的方法
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申请号: US10566249申请日: 2004-05-12
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公开(公告)号: US07629041B2公开(公告)日: 2009-12-08
- 发明人: Markus Parusel , Jann Schmidt , Herbert Groothues
- 申请人: Markus Parusel , Jann Schmidt , Herbert Groothues
- 申请人地址: DE Darmstadt
- 专利权人: Evonik Roehm GmbH
- 当前专利权人: Evonik Roehm GmbH
- 当前专利权人地址: DE Darmstadt
- 代理机构: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- 优先权: DE10336130 20030804
- 国际申请: PCT/EP2004/005058 WO 20040512
- 国际公布: WO2005/022245 WO 20050310
- 主分类号: B32B19/00
- IPC分类号: B32B19/00 ; G02B5/00
摘要:
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 V50 is 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 V50 is 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 RZ to the third power of the size of the spherical particles (B) RZ2/DPB3 is in the range from 0.0002 to 0.1300 μm−1.
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