摘要:
Chiral compounds of the formula I ##STR1## where: R.sup.1,R.sup.2,R.sup.3,R.sup.4 are hydrogen or aromatic, aliphatic or araliphatic radicals having 1 to 40 carbon atoms,R.sup.5,R.sup.6,R.sup.7,R.sup.8 are aromatic or aliphatic radicals having 1 to 20 carbon atoms,with the proviso that at least one of the radicals R.sup.1 to R.sup.8 contains a polymerizable group,are used as dopes in liquid crystals, in compositions for coating substrates and in the preparation of interference pigments which can be used in printing inks and surface coatings.
摘要:
Improved cholesteric special-effect layers are obtainable by comminuting cholesteric layers. These cholesteric layers are produced by applying at least one layer of a reactive, pourable cholesteric mixture to a moving substrate, by casting, and forming a solid cholesteric layer.
摘要:
A process for coating or printing substrates with a coating or printing composition comprises applying a polymerizable material containing liquid-crystalline, polymerizable monomers which carry at least two polymerizable groups for coating and at least one polymerizable group for printing, to the substrate, and subsequently carrying out the polymerization, where the coating composition or the printing composition comprises a.sub.1) a chiral liquid-crystalline monomer and b) a polymeric binder and/or monomeric compounds which can be converted into the polymeric binder by polymerization, or, in the case of emulsion coatings and printing inks, a dispersion auxiliary d), or the coating composition or the printing composition comprises a.sub.2) an achiral liquid-crystalline monomer, b) a polymeric binder and/or monomeric compounds which can be converted into the polymeric binder by polymerization, or, in the case of emulsion coatings and printing inks, a dispersion auxiliary d), and c) a non-liquid-crystalline chiral compound.
摘要:
Chiral nematic polyesters comprise as alcohol component chiral diol structural units and as acid component dicarboxylic acid residues comprising mesogenic groups. The polyesters are particularly suitable for surface coating.
摘要:
Polymerizable liquid-crystalline compounds of the formula IZ.sup.1 --Y.sup.1 --A.sup.1 --Y.sup.3 --M--Y.sup.4 --A.sup.2 --Y.sup.2 --Z.sup.2 IwhereZ.sup.1 and Z.sup.2 are radicals containing reactive groups via which polymerization can be effected,Y.sup.1 -Y.sup.4 are a single chemical bond, oxygen, sulfur, --O--CO--, --CO--O--, --O--CO--O--, --CO--NR--, --NR--CO--, --O--CO--NR--, --NR--CO--O-- or --NR--CO--NR--, where at least one of the groups Y.sup.3 and Y.sup.4 is --O--CO--O--, --O--CO--NR--, --NR--CO--O-- or --NR--CO--NR--,A.sup.1 and A.sup.2 are spacers having 2 to 30 carbon atoms in which the carbon chain may be interrupted by ether oxygen, thioether sulfur or by nonadjacent imino or C.sub.1 -C.sub.4 -alkylimino groups,M is a mesogenic group,R is C.sub.1 -C.sub.4 -alkyl,and compositions comprising them are distinguished by favorable liquid-crystalline phase-temperature ranges and can be used in optical display devices and in cholesteric liquid-crystalline colorants.
摘要:
Mixtures of liquid-crystalline compounds comprising at least two different substances of the formula I ##STR1## where Z.sup.1 and Z.sup.2, independently of one another, are polymerizable groups, Y.sup.1 and Y.sup.2, independently of one another, are each a direct bond, --O--, --COO--, --OCO-- or --S--, A.sup.1 and A.sup.2, independently of one another, are spacers, and R.sup.1, R.sup.2 and R.sup.3 are conventional substituents, and novel compounds of the above formula where at least two of Z.sup.1, Z.sup.2, Y.sup.1, Y.sup.2, A.sup.1 and A.sup.2 are not identical, are described. The novel mixtures and compounds are suitable, inter alia, as base material for color-effect materials and piezomaterials, preferably in chirally doped form.
摘要:
A polymerizable, chiral compound of the formula (I): (Z--Y.sup.1 -A-O--CO--O-M-Y.sup.2).sub.n X (I) where: A, M, Y.sup.1 and Y.sup.2, X, n and Z are as defined herein; and which compound is suitable for use in electro-optical displays or as chiral dopes for nematic or cholesteric liquid crystals for the production of layers which reflect in colors.
摘要:
The invention relates to a heat-insulating coating which comprises one or more cholesteric IR-reflecting layers and to processes for its preparation and to its use.
摘要:
Colorant preparations contain the following ingredients: a) at least one dispersed, substantially water insoluble dye, b) water, c) at least one dispersant d) a compound of the general formula I where R1, R2 are independently selected from hydrogen, (CH2—CH2—O)nH or (CH(CH3)—CH2—O)n—H, where n is an integer from 1 to 8; (CH2—CH2—O)a—(CH(CH3)—CH2—O)b—(CH2—CH2—O)c—(CH(CH3)—CH2—O)d—H, where a, b, c, d are each an integer from 0 to 7 and a+b+c+d=9. R3 is selected from straight-chain C2-C10-alkyl, C6-C14 aryl, identicallly or differently substituted by hydrogen or C1-C8-alkyl CH2—O—R4 where R4 is selected from C1-C10-alkyl.
摘要:
A process for treating a substrate comprises utilizing at least one aqueous formulation comprising (A) at least one binder obtainable by copolymerization of ethylene and (meth)acrylic acid and optionally one or more further comonomers, (B) at least one reaction product of at least one carbodiimide (C) with at least one diol, triol or polyol (D), or (C) at least one carbodiimide and optionally at least one diol, triol or polyol.