Method of preparing a composite material of silica network and c

Details Method of preparing a composite material of silica network and c Method of preparing a composite material of silica network and c

1994-07-06

1995-08-01

Thomas, Alexander S.

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

With charge transferring layer of specified composition

522172, 522 83, 522 99, 427515, 359 68, G02F 11333

Patent

active

054378966

ABSTRACT:
Method of preparing a composite material comprising a silica network and chains of a polyhydroxy compound which are interwoven therewith and a liquid crystal display device having a top coat of such a composite material.
A description is given of a method of preparing a composite material comprising a silica network and, interwoven therewith, chains of, for example, polyhydroxyalkyl acrylate, by first photopolymerizing a tetraalkenyl orthosilicate with UV-light and subsequently converting it into the composite material by subjecting it to a sol-gel treatment. The material obtained is optically transparent. In addition, the material exhibits very little shrinkage so that it can be deposited on a substrate in relatively thick layers. The composite material is very suitable for a top coat 5 on a color-filter layer 3 in a liquid crystal display device because, inter alia, it adheres well to the ITO layer 7.

REFERENCES:
patent: 5204381 (1993-04-01), Zeigler
patent: 5360834 (1994-11-01), Popall et al.
"`Inverse` Organic-Inorganic Composite Materials", by B. Novak et al, Macromolecules Dec. 1991, 24, pp. 5481-5483.
"The photopolymerization of Acrylates and Methacrylates Containing Silicon", by r. S. Davidson et al, Polymer, Dec. 1992, vol. 33, No. 14, pp. 3031-3036.
"New Surface-Coating Materials: Electron-Beam Curing of Some Silicon-Containing Acrylates", by R. J. Batten et al, Polymer, Dec. 1992, vol. 33, No. 14, pp. 3037-3043.

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