Seoul National University

Korea Institute of Science and Technology

Snu Rdb Foundation

Saehan Industries Incorporation

Ecotech Co., Ltd.

Polyplus Co., Ltd.

Young Chow Chemical Co., Ltd.

Seung-Yeop Kwak

Sung-Ho Kim

Dae-up Ahn

Jae-woo Chung

Jae-Jin Kim

Chang-Keun Kim

Sang-Wook Chun

Jae-Deok Jeon

Sang-Jae Jung

Jeong-Soo Choi

Seok-Bong Lee

Soon-Sik Kim

Se-Bum Son

Disclosed are plasticizer compositions including cyclodextrin derivatives, a flexible PVC composition with suppression of the migration of a plasticizer containing the same, and a manufacturing method thereof. The manufacturing method of the flexible PVC composition of the present invention includes steps of (S1) preparing cyclodextrin derivatives; (S2) mixing the cyclodextrin derivatives, PVC and a low molecular weight liquid plasticizer to form a plastisol; and (S3) heating the plastisol to form a solution and cooling the solution. The manufacturing method PVC-1 of the present invention may be useful to mass-produce flexible PVC with suppression of the migration of a plasticizer in a simple and economic manner without using solvents since the cyclodextrin derivatives are used as a compound that can suppress the migration of a plasticizer. The flexible PVC has an effect of reducing an amount of the migrated plasticizer without deterioration in its physical properties.

Plasticizer composition containing cyclodextrin derivatives, flexible PVC composition with suppression of the migration of plasticizer containing the same, and manufacturing method thereof

The present invention relates to a PVC product containing cyclodextrin derivative particles and capable of suppressing migration of a plasticizer and a method for manufacturing the same, which includes (S1) preparing cyclodextrin derivative particles, in which a hydroxyl functional group is replaced by a predetermined compound; (S2) inputting the cyclodextrin derivative particles, a water-based dispersion medium and a vinyl chloride monomer into a high-pressure reactor and performing polymerization to obtain cyclodextrin derivative particles-capsulated PVC particles, in which a plurality of the cyclodextrin derivative particles are dispersedly capsulated in PVC particles; and (S3) mixing the cyclodextrin derivative particles-capsulated PVC particles with a low molecular weight liquid plasticizer and molding the mixture in a predetermined shape using heat.

Poly(vinyl chloride) product containing cyclodextrin derivatives with suppression of the migration of plasticizer and manufacturing method thereof

The present invention relates to a manufacturing method of organic modifier-free exfoliated nano clay-polymer composite. The manufacturing method of organic modifier-free exfoliated nano clay-polymer composite includes (S) dispersing layered clay nanoparticles and dissolving a thermoplastic polymer in an acidic solvent; (S) adding the product of step (S) to a polymer non-solvent incapable of dissolving the polymer, but capable of dissolving the organic modifier separated from the organized layered clay nanoparticles; and (S) separating an organic modifier-free exfoliated nano clay-polymer composite from the product of step (S). The inventive manufacturing method can maximally improve the physical properties of composites through the addition of the exfoliated clay nanoparticles by removing the organic modifier that may deteriorate physical properties of the composite from the exfoliated clay nanoparticles dispersed therein.

Manufacturing method of organic modifer-free exfoliated nano clay-polymer composite

A solvent-free polymer electrolyte and a secondary battery employing the electrolyte are provided. The electrolyte includes: a porous film, including a first polymer and a second oligomer, the first polymer being at least one selected from the group consisting of poly (vinylidene fluoride-co-hexafluoropropylene) copolymers, polyvinylidenefluorides, polymethylmethacrylates, polyacrylonitriles, polyethyleneoxides, and celluloses having a polyether chain, and the second oligomer being at least one selected from the group consisting of poly(ethylene oxide-co-ethylene carbonate) copolymers with at least one terminal groups substituted by a halogen atom and polyethyleneglycols with at least one terminal group substituted by a halogen atom. An electrolyte comprising the second oligomer and a lithium salt is present in the pores of the porous film.

Porous film type solvent-free polymer electrolyte filled with oligomer/prepolymer electrolyte and secondary battery employing the same

The present invention discloses aliphatic polyester compound having highly branched structure for polyvinylchloride plasticizer and polyvinylchloride blend containing the same. Aliphatic polyester compound having highly branched structure for polyvinylchloride plasticizer according to the present invention is formed by self-condensation polymerization of monomer having one carboxy functional group and two hydroxy functional groups. Since such aliphatic polyester having highly branched structure has superior compatibility with polyvinylchloride and never flows out contrary to the conventional liquid plasticizer having low molecular weight of phthalate, etc., the problems such as the disturbance of endocrine system of human body and the destruction of ecosystem due to the efflux of plasticizer is not caused and since the same has superior efficiency of plasticization, it is possible to give polyvinylchloride sufficient flexibility.

Aliphatic polyester compounds having highly branched structure as a plasticizer of polyvinylchloride and flexible polyvinylchloride blend containing the same

A hyperbranched polyetherketone and a heat-resistant blend of polyvinylchloride with the same. The polyethereketone is synthesized by self-polycondensation of 3,5-bis&lsqb;4-&lsqb;(2,3,4,5,6-pentafluorophenyl)carbonyl&rsqb;phenoxy&rsqb;-4-hydroxbenzophenone or 3,5-difluoro-4-hydroxybenzophenone, and then substituting 50 to 80 mole % of fluorine atoms present in the side chains and ends of the PEK molecule by polar groups. In addition, a blend of polyvinylchloride can be manufactured using the hyperbranched polyetherketone by a melt blending technique applicable for industrial purpose at a temperature of 180 to 120&deg; C., and thus the blend of polyvinylchloride with the polyetherekentone can be applied to high temperature end-use products such as hot water pipes.

Dendritic polyetherketone and heat-resistant blend of PVC with the same

A reverse osmosis membrane having excellent antifouling property, which is advantageous in terms of fundamental prevention of fouling generated by inorganic crystalloids, organic contaminants, and microorganisms, and a method for preparing the same. The membrane can be manufactured by hydrolyzing a titanium compound in an acidic aqueous solution to produce TiO particles of nano scale; dispersing the produced TiO particles in an acidic aqueous solution of pH 1-6 or an alkaline aqueous solution of pH 9-13 to yield a stable TiO dispersed solution; and immersing a reverse osmosis membrane prepared by a known method in the TiO dispersed solution to incorporate TiO into the membrane.

Reverse osmosis membrane having excellent anti-fouling property and method for manufacturing the same

A hyperbranched polyetherketone and a heat-resistant blend of polyvinylchloride with the same. The polyetherketone is synthesized by self-polycondensation of 3,5-bis&lsqb;4-&lsqb;(2,3,4,5,6-pentafluorophenyl)carbonyl&rsqb;phenoxy&rsqb;-4-hydroxybenzophenone or 3,5-difluoro-4-hydroxybenzophenone, and then substituting 50 to 80 mole % of fluorine atoms present in the side chains and ends of the PEK molecule by polar groups. In addition, a blend of polyvinylchloride can be manufactured using the hyperbranched polyetherketone by a melt blending technique applicable for industrial purpose at a temperature of 180 to 120&deg; C., and thus the blend of polyvinylchloride with the polyetherketone can be applied to high temperature end-use products such as hot water pipes.

A composite reverse osmosis membrane may advantageously be prepared by the process comprising applying porous support layer onto a nonwoven fabric and then forming an ultrathin active layer of an aromatic polyester superposed thereon, the active layer being prepared by the interfacial polymerization of an aqueous solution of polyhydric phenol and a solution of aromatic acyl halide dissolved in an organic solvent; or applying a porous support layer onto a nonwoven fabric and then forming an ultrathin active layer of a copolymer of aromatic polyester and aromatic polyamide superposed thereon, the active layer being prepared by the interfacial polymerization of a mixed aqueous solution of polyhydric phenol and an aromatic amine with a solution of aromatic acyl halide dissolved in an organic solvent. The composite membrane of the present invention has improvements in properties, such as water-permeability, chlorine-resistance, oxidation stability, salt rejection rate, and durability.

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Seoul, South Korea

Seung-Yeop Kwak