Abstract: The instant invention relates to liquid crystal media comprising a strongly dielectrically positive component A, preferably comprising isothiocyanate compounds, most preferably compounds of formula I, as given in the text, and a further dielectrically positive component B, preferably comprising terminally polar substituted bi- or terphenyl compounds, most preferably comprising compounds of formula II, as given in the text, further to novel isothiocyanato compounds as well as to liquid crystal displays comprising these media, in particular to PDLC display and most particular to holographic PDLC displays.

Abstract: The invention relates to a process for the preparation of superabsorbent polymers based on fine-particled non-crosslinked and/or crosslinked aqueous polyacrylonitrile emulsions.

Abstract: An arrangement and a method are described for the transmission of address, instruction and/or data telegrams from a control unit to (at least) one controlled unit and for the return of a respective reception acknowledge signal from the controlled unit (units) to the control unit in response to each address, instruction and/or data telegram, the reception acknowledge signal signaling the control unit the correct transmission of the relevant address, instruction and/or data telegram.

Abstract: A process for producing a superabsorbent polymer is described. The process that entails a continuous hydrolysis of an aqueous emulsion of crosslinked or uncrosslinked polyacrylonitrile in the form of fine particles is carried out in a cascade of stirred tanks. The reaction with alkali-hydroxide solution an aqueous-alcoholic medium at 60 to 100° C. yields polymers that are suitable for the preparation of hygiene products, water-storing materials in agriculture, and sheathing of electrical cables.

Abstract: 1,4-disubstituted 2,6-difluorobenzene compound of formula I wherein R is an alkyl or alkenyl radical, A1 and A2 are independently (a) a trans-1,4-cyclohexylene radical in which a CH2 group may be replaced by -O- and/or -S, (b) a 1,4-phenylene radical in which a CH group may be replaced by N, (c) 1,4-cyclohexenylene, 1,4-bicyclo(2,2,2)octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl, Z1 and Z2 are —CO—O—, —O—CO—, —CH2O—,—OCH2—, —CH2CH2—, —CH═CH—,—C≡C—or a single bond m and n are 0, 1, 2 or 3, (m+n) is 1, 2 or 3, X is R or F, Cl, CF3, —OCF3, or —OCHF2, —OCF5, —CN or —NCS with the provisos that at least one of the radicals A1 and A2 present in the molecule is  and at least one of Z1 or Z2 is —COO—, are suitable as components of liquid-

Abstract: A process for modifying superabsorbent polymers is disclosed. The surface of a polymer containing hydrolyzed polyacrylonitrile in the form of particulates, is modified by crosslinking in a water/alcohol reaction mixture and in the presence of silica. The resulting product features improved absorbency under load and lesser degree of gel blocking.

Abstract: Water-soluble homo- and/or copolymers containing alkali metal and/or alkaline earth metal carboxylate groups and based on acrylic or methacrylic derivatives, and corresponding water-soluble homo- and/or copolymers containing carboxyl groups and homo- and/or copolymers containing ammonium carboxylate groups are provided, which homo- and/or copolymers possess excellent suitability for increasing the viscosity of aqueous systems, in particular of print pastes for textile treatment.

Abstract: 1,4-disubstituted 2,6-difluorobenzene compound of formula I wherein R is an alkyl or alkenyl radical, A1 and A2, in each case independently of one another, are (a) a trans-1,4-cyclohexylene radical in which a CH2 group may be replaced by —O— and/or —S, (b) a 1,4-phenylene radical in which a CH group may be replaced by N, (c) 1,4-cyclohexenylene, 1,4-bicyclo(2,2,2)octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl, Z1 and Z2 are —CO—O—, —O—CO—, —CH2—O—, —OCH2—, —CH2CH2—, —CH═CH—, —C≡C— or a single bond m and n are 0, 1, 2 or 3, (m+n) is 1, 2 or 3, X is R or F, Cl, CF3, —OCF3, or —OCHF2, —OCF5, —CN or —NCS with the proviso that at least one of the radicals A1 and A2 present in the molecule is are suitable as components of liquid-c

Abstract: Super-absorbent polymer in the form of pre-formed spherical particles obtainable by alkaline hydrolysis of aqueous emulsions of crosslinked and/or un-crosslinked homopolymers and/or copolymers of acrylonitrile in water/alcohol mixtures and the use of the polymer in hygiene products, as a water-storing material in agriculture and for the sheathing of electrical cables.

Abstract: Cellulose-containing, optionally wood-containing materials which have been obtained using water-dispersible polyisocyanates which in turn have been prepared by reaction of the following starting components:a) modified polyisocyanates of the formula (I) ##STR1## in which: R.sup.1 denotes an aliphatic hydrocarbon radical having 2 to 18 carbon atoms; a cycloaliphatic hydrocarbon radical having 4 to 15 carbon atoms; an aromatic hydrocarbon radical having 6 to 15 carbon atoms or an araliphatic hydrocarbon radical having 8 to 15 carbon atoms,R.sup.2 denotes an aliphatic hydrocarbon radical which has 10 to 35 carbon atoms and optionally contains double bonds,R.sup.3 denotes a hydrocarbon radical which is at least divalent and can also be heterocyclic, with inclusion of the ester oxygen or amide nitrogen from X, ##STR2## where R.dbd.H or C.sub.1 -C.sub.4 -alkyl, or R is a constituent of a cyclic structure,n denotes a number .gtoreq.2 and y denotes a number .gtoreq.

Abstract: The invention relates to polyurethane compositions and especially to elastic polyurethane fibers resulting therefrom which can be employed for swimwear in aqueous, chlorine-containing environments such as swimming pools, for example. The invention relates in particular to polyurethane compositions and especially to elastic polyurethane fibers resulting therefrom that contain hydrotalcites and/or other basic metal aluminium hydroxy compounds coated with polyorganosiloxane or with a mixture of polyorganosiloxane and polyorganohydrogensiloxane.

Abstract: The present invention relates to a process for preparing acylsuccinic acid polyesters by reactingA) a polyester, which is the reaction product oi) maleic acid, maleic acid esters, maleic anhydride, fumaric acid and/or fumaric acid esters and optionally other diacids, monoacids or their derivatives withii) diols and optionally monofunctional alcohols,wherein the molar ratio of diols to diacids and their derivatives is 0.667:1 to 1.5:1, and the molar ratio of maleic acid and its derivatives+ fumaric acid and its derivatives to other diacids and their derivatives is greater than 0.15:1, and the molar ratio of monofunctional compounds to difunctional compounds is less than 0.4:1, withB) aliphatic C.sub.2 -C.sub.22 aldehydes and/or cycloaliphatic C.sub.6 -C.sub.20 aldehydes,in the presence of 0.2 to 10 % by weight (based on the weight of polyester) of free radical initiators at a temperature of 60 to 160.degree. C.

Abstract: The present invention relates to a process for preparing polyisocyanates containing isocyanurate groups by trimerizing a portion of the isocyanate groups of an organic polyisocyanate component containinga) one or more diisocyanates corresponding to formula (1) ##STR1## wherein R represents a saturated, straight-chain, aliphatic hydrocarbon group having 8 to 15 carbon atoms and optionallyb) up to 95 NCO equivalent-%, based on the total equivalents a) and b), of one or more organic polyisocyanates other than a),in the presence of trimerization catalysts and terminating the trimerization reaction at any desired degree of trimerization.The invention also relates to the polyisocyanates containing isocyanurate groups obtained by this process and to their use, optionally in excess starting polyisocyanates and optionally blocked with blocking agents for isocyanate groups, as an isocyanate component for preparing polyisocyanate addition products.

Abstract: This invention relates to impact-resistant thermoplastic moulding compositions based on a graft rubber, a thermoplastic resin and a small quantity of a free acid-functional nitrile rubber.

Abstract: The invention relates to a process for the preparation of cinnamic acid derivatives which involves reacting chlorinated aromatic compounds and acrylic acid derivatives in the presence of palladium catalysts.

Abstract: The present invention relates to mixtures of cycloaliphatic diisocyanates corresponding to formula 1) ##STR1## wherein R represents a saturated, linear, aliphatic hydrocarbon residue having 8 to 15 carbon atoms.The present invention also relates to a process for the preparation of these diisocyanate mixtures and to their use for the production of polyisocyanate addition products.

Abstract: A process for preparing substituted 4-methylidenecinnamic acid derivatives of Formula (I). ##STR1## The variables are defined herein. The compounds of Formula (I) can be used, for example, as UV absorbers.

Abstract: A process for the production of super-absorbent polymers with a swelling capacity in water-containing liquids of up to 1,000 g/g in which aqueous emulsions of particularly high molecular weight polymers of acrylonitrile are partly hydrolyzed by reaction with aqueous solutions of alkali metal and/or alkaline earth metal hydroxides, the polymers are precipitated in powder form by addition of water-miscible organic solvents, separated off, dried and then optionally heated for a short time. The super-absorbent polymers are used as water-storing materials, for example in sanitary articles, in agriculture or in the sheathing of electrical cables.

Abstract: The invention relates to a process for the solventless production of elastic filaments based on segmented poly(urethane)s or poly(urethane urea)s having improved thermal properties and, hence, improved processing behavior, for example during the heat setting of fabrics containing the elastic fibers, by the use of a polyisocyanate containing isocyanurate groups in the reaction of long-chain, relatively high molecular weight polyhydroxyl compounds with organic diisocyanates and low molecular weight diols and, optionally, other auxiliaries and additives in the melt, direct spinning of the reaction mixture thus obtained and thermal aftertreatment of the elastic filaments obtained and also to the filaments obtainable by this process.

Abstract: Biphenylylethanes of the formula I ##STR1## in which one of the radicals R.sup.1 and R.sup.2 is X and the other radical R.sup.1 or R.sup.2 is R--Y-- whereX is H, halogen, --CF.sub.3, --OCHF.sub.2, --OCF.sub.3, --CN, --NCS or --NO.sub.2,R is alkyl, fluoroalkyl, alkenyl or oxaalkyl andY is O, S, --CO--O--, --O--CO--, --O--CO--O--, a single bond or--in the case where m=1--alternatively trans-1,4-cyclohexylene or ##STR2## m is 1 or 2, Ph is in each case identical or different radicals selected from the group comprising 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene and 3,5-difluoro-1,4-phenylene,L.sup.3 and L.sup.4 are each H, or one of these radicals is alternatively F,L.sup.1, L.sup.2and L.sup.5 are each H or F, with the proviso that in the case where X=CN or R.sup.1 =--NCS, Y is trans-1,4-cyclohexylene or ##STR3## and/or m=2 and/or one of the radicals L.sup.1, L.sup.2 and L.sup.