Abstract: A secure housing for a portable computer, which has a screen, operating keys and at least one connector, can be transferred from an open state to a closed state. In order to protect the computer and the data stored thereon, the secure housing can be locked in the closed state and conceals at least one operating key of the computer while the screen is exposed.

Abstract: A passenger seat including a holding device for a media reproducing apparatus, includes a base holding fixture attached to a backrest of said passenger seat, at least one adapter adapted to be detachably connected with said base holding fixture, said adapter being configured for holding said media reproducing apparatus at said base holding fixture, a standardized electronic interface to the power supply of said media reproducing apparatus, and a protective shutter fixedly connected with said backrest. The protective shutter is adapted to be moved from an open position in which access to said adapter and said media reproducing apparatus is allowed, into a closed position in which said media reproducing apparatus and said adapter are completely covered by said protective shutter. The protective shutter is of break-proof configuration and made at least partially from a translucent material such that a screen is visible through said protective shutter in the closed position.

Abstract: A passenger seat including a holding device for a media reproducing apparatus, includes a base holding fixture attached to a backrest of said passenger seat, at least one adapter adapted to be detachably connected with said base holding fixture, said adapter being configured for holding said media reproducing apparatus at said base holding fixture, a standardized electronic interface to the power supply of said media reproducing apparatus, and a protective shutter fixedly connected with said backrest. The protective shutter is adapted to be moved from an open position in which access to said adapter and said media reproducing apparatus is allowed, into a closed position in which said media reproducing apparatus and said adapter are completely covered by said protective shutter. The protective shutter is of break-proof configuration and made at least partially from a translucent material such that a screen is visible through said protective shutter in the closed position.

Abstract: A secure housing for a portable computer, which has a screen, operating keys and at least one connector, can be transferred from an open state to a closed state. In order to protect the computer and the data stored thereon, the secure housing can be locked in the closed state and conceals at least one operating key of the computer while the screen is exposed.

Abstract: Alkanals having a 2-alkyl branch are obtained from mixtures which contain the alkanals having a 2-alkyl branch in addition to n-alkanals, 3-alkylalkanals and/or further isomers by a process in whicha) the alkanal mixture is reacted with an aqueous formaldehyde solution in the presence of a secondary amine and of a carboxylic acid as a catalyst,b) the aqueous phase containing the catalyst and any unconverted excess formaldehyde is separated off andc) the alkanals having a 2-alkyl branch are isolated by distillation from the condensates of the other alkanals with formaldehyde.

Abstract: 1,1-disubstituted ethylene compounds of the general formula I ##STR1## where Z is COOR.sup.2, CN or COR.sup.3, R.sup.1 is an aliphatic, cycloalophatic, araliphatic, aromatic or heterocyclic radical which may be further substituted by functional groups which are inert under the reaction conditions, R.sup.2 is an aliphatic, cycloaliphatic or araliphatic radical of 1 to 15 carbon atoms and R.sup.3 is an aliphatic, cycloaliphatic or araliphatic radical of 1 to 15 carbon atoms which may be substituted by groups which are inert under the reaction conditions, and R.sup.1 together with R.sup.2 or R.sup.1 together with R.sup.3 may furthermore form an alkylene chain of 2 to 10 carbon atoms which may be substituted by groups which are inert under the reaction conditions, are prepared from a formyl compound of the general formula II ##STR2## where Z, R.sup.1, R.sup.2 and R.sup.3 have the above meanings, by a process in which the reaction is carried out in the presence of formaldehyde or paraformaldehyde and(a) a C.sub.

Abstract: Bridged, water-soluble copolymers are obtainable by(A) copolymerization of a monomer mixture of(a) from 50 to 99 mol % of acrylamide and/or methacrylamide,(b) from 50 to 1 mol % of a monoethylenically unsaturated monomer containing actual groups and(c) from 0 to 20 mol % of monomers which differ from (a) and (b),in the presence of a polymerization initiator under conditions such that the acetal groups of the monomers (b) undergo virtually no hydrolysis,(B) hydrolysis of the acetal groups of the monomers (b), present as copolymerized units in the copolymers (A),(C) condensation of the copolymers (B) containing aldehyde groups at a pH above 5, at most to a degree such that the resulting condensates are still water-soluble and(D) stopping of the condensation reaction by adding acid until the pH reaches 3 or less,and are used as paper stock additives in papermaking for increasing the wet strength of paper.

Abstract: 1,3-Di(alkoxycarbonylamino)propanes of the general formula I ##STR1## where R.sup.1, R.sup.2 and R.sup.3 can be identical or different and each is hydrogen, or an aliphatic, cycloaliphatic, araliphatic or aromatic radical, and R.sup.4 is an aliphatic, cycloaliphatic or araliphatic radical, are prepared by reacting an .alpha.,.beta.-unsaturated aldehyde with a carbamic acid ester by reacting in a first stage as the .alpha.,.beta.-unsaturated aldehyde a compound of the general formula II ##STR2## where R.sup.1, R.sup.2 and R.sup.3 have the abovementioned meanings, with a carbamic acid ester of the general formula III ##STR3## where R.sup.4 has the abovementioned meanings, at 0.degree.-150.degree. C. to give a 1,1,3-tri(alkoxycarbonylamino)propane of the general formua IV ##STR4## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 have the abovementioned meanings, and in a second stage heating the compound of the general formula (IV) in the presence of a hydrogenation catalyst and hydrogen under 1-300 bar at 100.