Abstract: This invention relates to a process for manufacturing terephthalic acid and more particularly, to a process for manufacturing and recovering the highly purified terephthalic acid, in accordance with the practice of this invention comprising the following procedurses: alkali weight-reduction waste water discharged from weight-reduction process in a polyester textile dyeing complex is dissolved in water, adsorbed to remove impurities, and through acid-neutralization, terephthalic acid of this invention may be obtained.

Abstract: Disclosed is a unidirectional fiber sheet comprising an arranged fiber layer, a multi axial scrim, and a release paper having 3 to 80% of its surface area coated with an adhesive. The adhesive is applied to the release paper in the form of stripes which may be positioned parallel, perpendicular or oblique to the filaments of the arranged fiber layer. The unidirectional fiber sheet according to the present invention is prepared by partially coating a release paper with an adhesive, and heat-pressing together an arranged fiber layer prepared from filament tows, a multi axial scrim having a net structure to support the arranged fiber layer, and the release paper so as to bind the three together.

Abstract: This invention is a poly(vinyl alcohol) microfibrillar short fiber and its method of preparation, especially manufacturing a microfibrillar poly(vinyl alcohol) short fiber having high tensile strength, high tensile modulus, high fineness, and excellent alkali resistance using a special saponifying agent and through an advanced mechanical shearing operation in the course of saponification of poly(vinyl pivalate) to poly(vinyl alcohol) without requiring spinning, drawing, and heat treatment.

Abstract: This invention relates to a process for manufacturing terephthalic acid and more particularly, to a process for manufacturing terephthalic acid in a high recovery rate with high purity in accordance with the practice of this invention comprising the following procedures: polyethylene terephthalate (hereinafter referred to as "PET") scrap is hydrolyzed with alkaline aqueous solution to give the slurry of terephthalic acid alkali metal/earth metal salt, then the particles of terephthalic acid formed from acid-neutralization are enlarged to recover terephthalic acid with high purity.

Abstract: This invention relates to a process for manufacturing terephthalic acid and more particularly, to a process of manufacturing and recovering the highly purified terephthalic acid using an alkali weight-reduction waste water discharged from weight-reduction process in a polyester textile dyeing complex, in accordance with the practice of this invention comprising the following procedures: polyethylene terephthalate (hereinafter referred to "PET") waste scrap materials are hydrolyzed to prepare the slurry of disodium terephthalate. Then, said slurry dissolved in water is adsorbed to remove impurities, and followed by acid-neutralization to obtain terephthalic acid of this invention.

Abstract: This invention relates to a stabilized isothiazolone solution and more particularly, to a stabilized isothiazolone solution comprising isothiazolone expressed by the following formula (I), stabilizer expressed by the following formula (II), and organic solvent diffusing these compounds effectively: ##STR1## In these formulae, n, R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 have the same definitions as defined in the detailed description of this application, respectively.

Abstract: The present invention is directed to a pharmaceutical compositions improving percutaneous absorbability by absorption assistants, which remarkably increase permeation and dissolution of piroxicam, and penetration enhancers. A further surprising feature of the present invention resides in the fact that absorption assistant which assists penetration enhancer is able to include the active substance excessively in adhesive matrix as solvent of the active substance.

Abstract: A plate type heat transfer device which has a number of rectangular or oval cavities (or cell) in its transverse cross-section, is charged with a certain amount of a working fluid in each of the cavities (or cells). Heat from the lower surface of the plate is transferred to the upper surface of the heat transfer device. The device has a wide range of application, such as for the stabilization or protection of foundation for pipelines roads, airport runways, structures, etc., by keeping the foundation intact in extremely cold regions, or to the ceilings or floors of relatively large spaces, such as office buildings, manufacturing factories, storage buildings, or even to the roofs of refrigerator cars where the temperature control is required.

Abstract: The present invention is directed to new ginkgolide derivatives, which may be used for the prevention or treatment of various PAF-induced diseases, and the pharmaceutical uses of these derivatives. The present invention is also directed to a process for preparing these ginkgolide derivatives.

Abstract: The present invention relates to new ginkgolide derivatives of the formula (I) as below which represents PAF-antagonistic activity and the method for the preparation thereof, by that the cyclic compounds of substituted Ginkgolide B derivatives are produced by reacting the known Ginkgolide B and C mixture having the hydroxy group in 1- and 10-carbon with acid, then they are separated, and separated Ginkgolide B derivatives is hydrolyzed in acidic aqueous solution. And the present invention is related to make use it as PAF-antagonistic agent through separating the only one component of the new ginkgolide derivative by those methods.

Abstract: The present invention relates to an improved process for selectively preparing 4-isothiazolin-3-one having the following structural formula(I), consisted of preparing 3,3'-dithiodipropionyldichloride by reacting 3,3'-dithiodipropionic acid with thionylchloride, reacting with amine compound to prepare 3,3'-dithiodipropioneamide, and herein adding sulfrylchloride in organic solvent to cyclize, which is useful as antiseptic or anti-infectives for cooling water, metal processing oils, paints, cosmetics, surfactants, sensitizers, etc. ##STR1## wherein, R.sup.1 is methyl or n-octyl group;R.sup.2 is hydrogen or chlorine atom.

Abstract: The present invention relates to a method for preparing enteric-coated oral drugs containing acid-unstable compound, in particular an enteric-coated oral drug prepared in the form of acid-stable dosage units as inclusion complex formed by reacting benzimidazole derivative, acid-unstable compound, with cyclodextrin in alkaline solution.