Invention Application
US20120003403A1 MULTILAYER CELLULOSE ESTER FILM HAVING REVERSED OPTICAL DISPERSION
审中-公开
具有反向光学分散度的多层纤维素酯膜
- Patent Title: MULTILAYER CELLULOSE ESTER FILM HAVING REVERSED OPTICAL DISPERSION
- Patent Title (中): 具有反向光学分散度的多层纤维素酯膜
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Application No.: US13157580Application Date: 2011-06-10
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Publication No.: US20120003403A1Publication Date: 2012-01-05
- Inventor: Bin Wang , Charles Michael Buchanan
- Applicant: Bin Wang , Charles Michael Buchanan
- Applicant Address: US TN Kingsport
- Assignee: EASTMAN CHEMICAL COMPANY
- Current Assignee: EASTMAN CHEMICAL COMPANY
- Current Assignee Address: US TN Kingsport
- Main IPC: C09K19/02
- IPC: C09K19/02 ; G02B1/00 ; B32B23/20
Abstract:
The present invention relates to a multilayer cellulose ester film having a reversed optical dispersion. The film can have an A-B bi-layer or an A-B-A tri-layer configuration. The cellulose ester material for layer A has a hydroxyl degree of substitution (DSOH) from 0 to 0.5, while the cellulose ester material for layer B has a DSOH from 0.5 to 1.3. By manipulating the thickness of layers A and B, and the film stretching conditions, desirable optical retardation and optical dispersion properties can be obtained. The film can be used as an optical waveplate in liquid crystal displays to improve viewing angle, contrast ratio, and color shift.
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