Abstract: An optically active compound having characteristics necessary for realizing liquid crystal compositions provided with suitable characteristics, particularly a negative temperature characteristic and a very high twistability, and a liquid crystal composition containing the compound are provided, which optically active compound is expressed by the formula ##STR1## wherein R.sup.1 and R.sup.2 are 1-20 C alkyl or alkoxy or H; l, m and n are 0 or 1; X is F, Cl, Br or CN; and ##STR2## each independently represent ##STR3## wherein Y is H, halogen or CN.

Abstract: The present invention is connected with a low-melting polyimide copolymer containing 30 to 90 mole % of an imide repeating unit represented by the following formula (I) and 10 to 70 mole % of an imide repeating unit represented by the following formula (II), and having a logarithmic viscosity number of 0.1 to 4 dl/g: ##STR1## wherein R.sup.1 is at least one of ##STR2## Furthermore, the present invention is connected with a method of preparing the low-melting polyimide copolymer.Since having a melting point of about 300.degree. to about 400.degree. C., the polyimide copolymer of the present invention has heat resistance and enables melt-moldings such as extrusion and injection molding.

Abstract: A disposable diaper includes a semi-rigid absorbent body and high flexible side flaps disposed on laterally opposite side thereof. Each of said side flaps includes a first flap disposed outside said absorbent body and a second flap diverged from said first side flap. Each of said second flaps has the associated one of an elastic band incorporated therein and turned up under an elastic effect of said associated elastic band at least along a line of the divergence.

Abstract: Glycosaminoglycan-degrading enzyme preparation containing krill hyaluronidase, and a method of producing said preparation.

Abstract: A device (10) for displaying information, in particular more extensive braille texts, includes a pattern setter (16) and eraser means (36). Above the pattern setter, there is a cover plate (14) comprising at least one removable character carrier (20) composed of a plurality of form-fit profiles (30). In or between the latter, rows of spring-biased pins (22) are guided which have undercuts (42) adapted to be locked by lateral teeth (40) of elastic strips (38). Only those pins which have been lifted by the pattern setter (16), e.g. according to programmed control, project with their tips (24) from the top face (34) of the character carrier (20) which may be detached for independent use as a reading board, printing plate, deep-drawing die, etc. For erasing, the strips (38) are shifted between the profiles by half the grid distance (a/2) so that the teeth (40) will release the set pins for return to their starting position.

Abstract: Apparatus for stretching and folding a limp fabric piece (1), having a plurality of opposed elastic bands (12,12',13,13') extending therefrom comprising a platform (2) having a foldable segment, means for folding said foldable segment relative to the platform (2),A limp fabric piece feeding plate (5) for feeding said limp fabric piece (1) to said platform (2) and holding said fabric piece (1) thereon in an extended condition and in a pre-determined position to enable eventual folding of the fabric piece (1) to produce a garment,means for moving said plate (5) horizontally or vertically,suction means located adjacent said platform (2) for applying suction to the elastic bands (12,12',13,13') extending from the fabric piece (1),elastic band gripper means associated with the suction means for gripping and holding the sucked-in elastic bands (12,12',13,13'), relative to said suction means,means for moving said suction means relative to said platform (2) to stretch said fabric piece (1),garment gripper means assoc

Abstract: A ferroelectric liquid crystal composition exhibiting SC* phase within a broad temperature range including room temperature and also having high-speed response properties and a light switching element using the above-mentioned liquid crystal composition and exhibiting high-speed response properties are provided, which composition comprises at least one member of chiral compounds expressed by the formula ##STR1## wherein R.sup.1 and R.sup.2 each represent a linear or branched chain alkyl, alkoxy, alkoxyalkoxy, alkoxycarbonyl, alkanoyl or alkanoyloxy group each of 1 to 18 C and at least one of R.sup.1 and R.sup.2 has an asymmetric carbon atom in the alkyl chain moiety of these groups, and at least one member of chiral compounds having a spontaneous polarization value of 40 nC/cm.sup.2 or more.

Abstract: Here is disclosed a disposable diaper comprising an absorbent core of a desired thickness, a water-permeable topsheet covering at least an upper surface of said core, a water-proof or a water-impervious backsheet covering at least a bottom surface of said core, water-impervious side flaps extending outwardly of opposite sides of said core, first elastic bands adapted to form elastic gathers longitudinally of the respective flaps and leakage protecting baffles formed along opposite side edges of said core and contained second elastic bands to provide elastic gathers longitudinally thereof.

Abstract: A security railing formed from plastics material pipe which is lightweight, low cost, and non-corrosive. The top railing and preferably the posts of the security railing are formed of double pipe construction comprising a first pipe and a second pipe inside the first pipe, the second pipe having an outside diameter related to the inside diameter of the first pipe. The first pipe is of plastics material and the second pipe preferably also is of plastics material. A lower railing utilizes a plastic pipe having the same outside diameter as the laminated top railing. T connectors and cross connectors are used at the joints between the upper and lower railings and the posts, and these T connectors and cross connectors are of the same outer dimension as the first pipe to give the railing a smooth contour.

Abstract: A key switch that includes both a locking mechanism and a switch mechanism that are separately replaceably coupled together so that either the locking mechanism or the switching mechanism may be individually replaced. The locking mechanism includes a hollow outer cyinder, a hollow inner cylinder rotatably mounted within the interior of the outer cylinder and a notched bolt extending from the rear end portion of the inner cylinder. The switch mechanism includes a case, a cam accommodated therein, and two pairs of contact terminals which are alternately operable by the cam. The cam of the switch mechanism is fitted on the notched bolt of the locking mechanism.

Abstract: A copolymer of sulfur dioxide and polyalkylpolysilylstyrene composed of repeating units of formula I: ##STR1## where R is a lower alkyl group, p is an integer between 2 and 5, q in an integer between 1 and 10 representing the sequence length of polyalkylpolysilylstyrene, and n is a number between 5 and 10,000, and having a number-average molecular weight of 2,000 to 2,000,000. This copolymer is a novel and useful positive resist material which is highly sensitive to light, or electron-beam or X-ray radiation and is of high dry etching resistance.

Abstract: The invention relates to a process for the production of alkali metal chlorates by electrolysis of alkali metal chloride. The electrolyte is prepared by addition of a crystal slurry having a dry content above 50 per cent by weight to the of alkali metal chloride depleted reaction solution flowing out from th eelectrolyster. The crystal slurry has been prepared by dissolving an alkali metal chloride in water whereafter the obtained water solution has been purified in a known manner and concentrated to the stated dry content.

Abstract: The invention is concerned with a method of preventing adhesions or accretions of body tissues inter se by means of employing a degradable gel of a crosslinked carboxyl-containing polysaccharide. The invention also covers a gel product to be used for this purpose, and a process for preparing said product by means of crosslinking with a di- or polyfunctional expoxide at a pH of from 2 to 5.

Abstract: Hexafluoracetone or its hydrate is produced in a higher yield than that of the conventional process (1) by oxidizing a heptafluoroisobutenyl ether with ozone or (2) by thermally decomposing an octafluoroisobutyl ether or a heptafluoroisobutenyl ether in the presence of oxygen and an activated carbon catalyst.

Abstract: Here are disclosed a composite non-woven fabric having a high dimensional stability and a process for preparing such non-woven fabaric. This non-woven fabric is prepared by a cross-stretching starting non-woven fabric obtained by a fiber entanglement treatment of a staple fiber web by fluid jets to form a substrate, then introducing short fibers onto this cross-stretched substrate and filling said cross-stretched substrate with said short fibers by further fiber entanglement treatment also by fluid jets. Such composite non-woven fabric is suitable particularly as cloth for disposable medican garments or the like.

Abstract: A granular fertilizer with a degradative coating characterized in that after it has been applied to soil and its fertilizer component has dissolved out, the resulting coating part degrades rapidly is provided, which degradative coating comprises an ethylene-carbon monoxide copolymer as its indispensable component and a rubbery resin, an ethylene-vinyl acetate copolymer resin or powder as an optional component.

Abstract: A ferroelectric liquid crystal composition exhibiting SC* phase within a broad temperature range including room temperature and yet having cholesteric phase and further high-speed response properties and a light switching element using the above composition and having high-speed response properties are provided, which composition comprises an achiral compound expressed by the formula ##STR1## wherein R.sup.1 and R.sup.2 each represent the same or different linear or branched chain alkyl group of 1 to 18 carbon atoms, in 20 to 70% by weight and having cholesteric phase; and which composition may further comprise at least one member of optically active compounds selected from four specified pyrimidine compounds.