Polymer dispersed liquid crystals in radiation curable electron-rich alkene-thiol polymer mixtures
US5516455A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 1995 |
| Grant date | May 14, 1996 |
| Priority date | — |
| Expiry date | Feb 17, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/544
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polymer dispersed liquid crystal composite prepared from: (1) at least one multifunctional electron-rich alkene that does not undergo appreciable homopolymerization and is selected from the group consisting of (a) vinyl ethers and vinyl sulfides; (b) keteneacetals, ketenethioacetals and methylene oxathiolanes, wherein the carbon of the carbon-carbon double bond not bearing the electron donating group has bonded to it H or a combination of H and a C1 to C.sub.6 alkyl, preferably a methyl group; (c) ortho or para vinyl phenyl ethers or thioethers (also known as styryloxy or styrylthio ether monomers); or (d) bicylic alkenes which have, as a result of their stereoelectronic configuration, unequal .pi.-electron density above and below the plane of the carbon-carbon double bond axis; (2) a multifunctional thiol; (3) a photoinitiator; and (4) liquid crystal material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.