Inkjettable polymerizable liquid crystalline mixture
A polymerizable mixture for ink jetting, having liquid crystalline phases comprising the following components: a) 50-80 wt % mono-functional LCP's, b) 10-50 wt % of a higher functional LCP's, f) 0.01-5 wt % initiators, preferably below 1% g) 0.01-5 wt % inhibitors, preferably below 1% h) 0-20 wt % additives, preferably below 10 wt %, with the provision that the total amount of the components is 100 wt %, characterized in that the polymerizable mixtures has a viscosity smaller than 0.015 Pa s at 100° C. and yet remaining thermally stable.
1. A polymerizable solvent-free mixture for ink jetting, having liquid crystalline phases comprising the following components:
a) 50-80 wt. % mono-functional polymerizable liquid crystals
b) 10-50 wt. % of a higher functional polymerizable liquid crystals
f) 0.01-5 wt % initiators
g) 0.01-5 wt % inhibitors
h) 0-20 wt % additives,
with the provision that the total amount of the components is 100 wt %, characterized in that the polymerizable mixture has a viscosity smaller than 0.015 Pa·s at 100° C. and yet remaining thermally stable.
2. The polymerizable mixture according to claim 1 , characterized in that said mixture further comprises c) 10-30 wt % liquid crystalline inert monomers, preferably from 15-25 wt %.
3. The polymerizable mixture according to claim 2 , characterized in that the liquid crystalline inert monomers c) are non-chiral.
4. The polymerizable mixture according to claim 1 , characterized in that said mixture further comprises d) 0.01-30 wt % non-liquid crystalline functionalized monomers.
5. The polymerizable mixture according to claim 1 , characterized in that said mixture further comprises e) 0.01-30 wt % non-liquid crystalline inert monomers.
6. The polymerizable mixture according to claim 1 , characterized in that the components a) and/or b) are acrylates.
7. The polymerizable mixture according to claim 1 characterized in that the additives h) are selected from a group comprising photochromic pigments or dyes, thermochromic pigments or dyes, electrochromic pigments or dyes, ionochromic pigments or dyes, halochromic pigments or dyes, solvatochromic pigments or dyes, tribochromic pigments or dyes and piezochromic pigments or dyes.
8. The polymerizable mixture according to claim 1 characterized in that the additives h) are conductive or semi-conductive additives.
9. The polymerizable mixture according to claim 8 characterized in that the additives h) are selected from a group comprising nanometer or micrometer sized rods, flakes, spheres or otherwise suitably shaped conductive particles of metals, alloys or semiconductor-based materials.
10. The polymerizable mixture according to claim 8 characterized in that the additives h) are selected from a group comprising
semi-conductive conjugated polymers
semi-conductive liquid crystals.
11. The polymerizable mixture according to claim 1 characterized in that the additives h) are selected from a group comprising magnetic additives, such as paramagnetic, super-paramagnetic, diamagnetic or ferri-magnetic particles.
12. The polymerizable mixture according to claim 1 , characterized in that the mixture is aligned by a substrate layers selected from a group consisting of rubbed polyimide, rubbed tri-acetyl-cellulose, rubbed polyethylene terephthalate, rubbed polyethylene, or rubbed polypropylene.
13. The polymerizable mixture according to claim 1 , characterized in that the components from e) through f) are selected such that they do not prohibit the alignment of the liquid crystals from components a) through d).
14. The polymerizable mixture according to claim 1 , characterized in that the components from a), b) d) and e) are functionalized to form a polymer structure.
15. The polymerizable mixture according to claim 1 , characterized in that the components a) through h) are selected such that phase-separation is suppressed at least only before polymerization but preferably also during polymerization.
16. A security feature created with a mixture according to claim 1 , characterized by a substrate having a printed pattern containing unique information.
17. The security feature according to claim 16 , characterized in that substrates of the security feature contain further authentication features, including holograms, retro-reflecting layers, and interference stack reflectors.