Cheil Synthetics Inc.

Hoseo University Academic Cooperation Foundation

Cheil Synthetics Incorporation

Korea Advanced Institute of Science and Technology

Saehan Industries Incorporation

Cms Technology, Inc.

Dae W Ihm

Shi Surk Kim

Soon Sik Kim

Jeong Lim Kim

Chang S Lee

Young Goo Kang

Myung S Lee

Young Jin Kim

Bo Sung Kim

Seon Hwi Cho

Dae Jeong Kim

Jong Hee Kim

Kwang Tae Kim

Seung B Jun

Soo Sung Lee

Seong I Woo

Hee S Ihm

Young C Lee

Moon S Beak

Hae S Jun

Jung: Sung G

Byeng H Kim

Kwon I Kim

Iee K Kim

Disclosed herein are a di-(1-vinylimidazole) metal phthalocyanine compound in which 1-vinylimidazoles as ligands are included in a phthalocyanine having a metal, a composition comprising the same and a preparation method thereof. The di-(1-vinylimidazole) metal phthalocyanine compound has an excellent UV blocking effect together with low surface resistance and is prepared but by charging a powder phase with nitrogen, not by dissolving raw materials in an organic solvent as in the prior art.

DI-(1-Imidazole) metal phthalocyanine compound, composition comprising the same and preparation method thereof

Disclosed herein are a di-(4-vinylpyridine) metal phthalocyanine compound in which 4-vinylpyridines as ligands are included in a phthalocyanine having a metal, a composition comprising the same and a preparation method thereof. The di-(4-vinylpyridine) metal phthalocyanine compound has an excellent UV blocking effect together with low surface resistance and is prepared but by charging a powder phase with nitrogen, not by dissolving raw materials in an organic solvent as in the prior art.

DI-(4-vinylpyridine) metal phthalocyanine compound, composition comprising the same and preparation method thereof

Disclosed is a method for the preparation of 3-(hydroxyphenylphosphinyl)-propanoic acid which is commonly used as a flame retardant for polyester resins. The preparation of 3-(hydroxyphenylphosphinyl)-propanoic acid is attained by the condensation of phenylphosphonous dichloride and acrylic acid and the hydrolysis of the condensate. In the condensation, the mole ratio of phenylphosphonous dichloride to acrylic acid is within the range of 1:1.1 to 1:1.25. Under a pressure of greater than 1 atm, acrylic acid is added at 65.about.110.degree.C. at an amount more by 10.about.25 mole % than that of phenylphosphonous dichloride and the condensation is carried out at a temperature of 70.about.100.degree. C. under at greater than 1 atm, to produce 3-(hydroxyphenylphosphinyl)-propanoic acid at high yields with desired color.

Method for preparation 3-(hydroxyphenylphosphinyl)-propanoic acid

A photopolymerization photoresist composition having a binder resin, a multifunctional compound, a photopolymerization initiator, a sensitizer and other additives. The photopolymerization initiator has one or more 4,6-bis(chloromethyl)-s-triazine compound containing a diazophenyl group. The initiator acts as a chromophore and is represented by the following general formula I: ##STR1## wherein the position at which the diazo group bonds to phenyl group may be changed. R is an aliphatic radical or an unsubstituted- or substituted aromatic radical and n is an integer of 0 to 2.

Photoresist composition containing 4,6-(bis)chloromethyl-5-triazine

There is provided a process for the preparation of composite semi-permeable membrane superior in selectivity and permeability, capable of improving bonding strength between a porous support layer and a reinforcement and mechanical strength of semi-permeable membrane. The composite semi-permeable membrane is prepared by subjecting woven fabric or non-woven fabric to corona discharge with a discharge power of approximately 10 to approximately 15 watt for a period of approximately 20 to approximately 40 seconds, spraying water over one surface of the fabric, casting porous support substance on the other surface of the fabric when a time of approximately 5 to approximately 10 seconds has elapsed after the spray, and laminating a crosslinked polyamide ultrathin film on the porous support substance, the polyamide ultrathin film being synthesized by interfacial polycondensation of a multifunctional amine solution and a multifunctional halogen solution.

Process for the preparation of composite semi-permeable membrane

There is disclosed a biodegradable copolyester having a combination structure consisting of one or more repeating unit of alkyleneterephthalate and one or more repeating unit of hydroxyalkanoate, represented by the following general formula I: ##STR1## wherein n is an integer not more than 10, R is --CH.sub.3 or --C.sub.2 H.sub.5,

Biodegradable copolyester and method for preparing the same

There is disclosed a method for the production of aliphatic copolyester film. The method comprises the steps of: applying esterification or ester-interchange to a reaction mixture of at least one acid component selected from the group consisting of succinic acid, succinic anhydride and succinic acid ester, 1,4-butanediol as a main diol component, 2,2-dimethyl-1,3-propanediol of 1 to 30% by mole based on the mole of the acid component, multifunctional compound 0.01 to 1% by mole, based on the mole of the acid component, multifunctional compound have more than three functional group of hydroxy group or carboxy group at below 220.degree. C., so as to give an oligomer mixture; polycondensing the oligomer into an aliphatic copolyester at a temperature of 240.degree. to 260.degree. C. under reduced pressures of not more than 1 mmHg in the presence of a catalyst; and melt-extruding the aliphatic copolyester using T die. Improved in draw ratio, the aliphatic copolyester film provided by the method can be applied to various applications, such as films, bottles, glass fiber-reinforced plastics, adhesives, paints.

Method for the production of aliphatic copolyester film

A method for the preparation of prepreg of thermoplastic composite resin is disclosed. The method comprises the steps of: laminating a non-oriented glass fibrous mat experiencing needle punching on a base layer of a polypropylene film; forming a complex layer which comprises a plurality of yarns unidirectionally oriented on the both sides of a polypropylene film on the non-oriented glass fibrous mat atop the base layer; overlying a needled, non-oriented glass fibrous mat on the complex layer of the unidirectionally oriented glass fibrous yarn/polypropylene film/unidirectionally oriented glass fibrous yarn; covering a top layer of a polypropylene film over the needled, non-oriented glass fibrous mat, to form a laminate; and pressing the laminate at high temperatures under high pressures. By virtue of employing the unidirectionally oriented glass fibrous yarns which can be satisfactorily impregnated into the polypropylene resin, the prepreg of thermoplastic composite resin is superior in mechanical strength, thermal resistance and fluidity. Thermoplastic composite material containing unidirectionally oriented glass fibers with no damage can be used as substance requiring high strength, such as construction materials, machine elements and etc and as articles requiring compress molding, such as auto parts, especially bumper beam.

Method for the preparation of prepreg of thermoplastic composite resin

A method for preparation of a polyether-ester elastomer. The method comprises admixturing dibasic acid with short chain diol for the formation of a short chain ester monomer represented :into general formula (I) and with polyglycol for the formation of a long chain ether moromet represented into general formula (II), adding the alkali salt of dialkylsufoisophthalate to the admixture to react the admixture until the discharge of methanol is tip to above 70%, adding stabilizing agent to perform the polymerization reaction, and then, blending phenolic alkali metal salt. ##STR1## wherein R is a biradical obtained by removing carboxyl group from a dicarboxylic acid having a molecular weight not more than 400,

Method for the preparation of copolyester elastomer having high viscosity

A biaxially stretched polyester film is disclosed. The biaxially stretched polyester film comprises substantially spherical silica particles of colloidal state having average diameters ranging from approximately 20 nm to approximately 200 nm in amounts ranging from approximately 0.005% to approximately 1.0% by weight based on the total weight of the polyester; and alumina particles having average diameters ranging from approximately 50 nm to approximately 500 nm in amounts ranging from approximately 0.05% to approximately 5.0% by weight, the average diameter of the alumina particles being larger than that of the silica particles. The biaxially stretched film prepared according to the present invention has excellent surface properties such as slip property and abrasion resistance, so that the film may be used for manufacturing final products without scratches and white powders occurring thereon.

Biaxially stretched polyester film

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Seoul, South Korea

Dae W Ihm