Optical polymer blend with bimodal particle sizes
US6979704B1 · kind B1 · utility
36Cited by
38References
21Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 29, 2002 |
| Grant date | Dec 27, 2005 |
| Priority date | — |
| Expiry date | Dec 12, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K2201/014
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An optical polymer blend includes sub-wavelength particles to modify the refractive index of a polymer to match the refractive index of micro-particles added to adjust the bulk coefficient of thermal expansion of the blend. A relatively large amount of material may be added to the resin to adjust the bulk coefficient of thermal expansion without unduly increasing the viscosity of the blend before setting. In some applications blends are used for molded or extruded optical elements, in other applications, blends are used for optical adhesives with low coefficients of thermal expansion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.