Patents Assigned to Woongjin Chemical Co., Ltd.
-
Patent number: 9839879Abstract: A forward osmosis membrane for seawater desalination and a method for preparing the same. The forward osmosis membrane has a composite membrane structure including a nonwoven fabric layer; a hydrophilic polymer layer; and a polyamide layer. The hydrophilic polymer layer formed on the nonwoven fabric layer facilitates an inflow of water from the feed water to the draw solution to enhance flux and realize high water permeability in the direction of osmosis. The polyamide layer not only secures contamination resistance and chemical resistance but also minimizes the back diffusion of salts of the draw solution in the direction of reverse osmosis. Hence, the forward osmosis membrane of the present invention is greatly useful for desalination of high-concentration seawater.Type: GrantFiled: December 24, 2014Date of Patent: December 12, 2017Assignee: Woongjin Chemical Co., Ltd.Inventors: Sung Dae Chi, Bong Jun Cha, Jong Hwa Lee, Doo Ri Kim, Su Jeong Lim
-
Patent number: 9248410Abstract: A forward osmosis membrane for seawater desalination and a method for preparing the same. The forward osmosis membrane has a composite membrane structure including a nonwoven fabric layer, a hydrophilic polymer layer, and a polyamide layer. The hydrophilic polymer layer formed on the nonwoven fabric layer facilitates an inflow of water from the feed water to the draw solution to enhance flux and realize high water permeability in the direction of osmosis. The polyamide layer not only secures contamination resistance and chemical resistance but also minimizes the back diffusion of salts of the draw solution in the direction of reverse osmosis. Hence, the forward osmosis membrane of the present invention is greatly useful for desalination of high-concentration seawater.Type: GrantFiled: February 9, 2011Date of Patent: February 2, 2016Assignee: Woongjin Chemical Co., Ltd.Inventors: Sung Dae Chi, Bong Jun Cha, Jong Hwa Lee, Doo Ri Kim, Su Jeong Lim
-
Patent number: 9170355Abstract: A reflective polarizer of the invention has excellent optical properties even though a very small number of polymer components per unit area is disposed inside a matrix thereof compared to reflective polarizers of the related art, which include birefringent polymer, since the polymer inside the matrix has a plate-like shape. This is advantageous for covering the entire range of visible light, since a plate-like polymer having a variety of optical thicknesses can be used. The additional processing of bonding the skin layer is not performed, since the skin layer is formed on at least one surface of the core layer in the state in which it is molten. This can greatly reduce manufacturing costs, and is advantageous in that it maximizes optical properties in a limited thickness.Type: GrantFiled: February 7, 2012Date of Patent: October 27, 2015Assignee: WOONGJIN CHEMICAL CO., LTD.Inventors: Duk Jae Cho, Jung Wan Han, Myeong Ki Baek, Hwang Kyu Lee, Seung Jin Ko
-
Patent number: 9089820Abstract: A selective membrane having a high fouling resistance. In one embodiment, the selective membrane is a composite polyamide reverse osmosis membrane having a hydrophilic coating made by covalently bonding a hydrophilic compound to the polyamide membrane, the hydrophilic compound including (i) a reactive group that is adapted to covalently bond directly to the polyamide membrane, the reactive group being at least one of a primary amine and a secondary amine; (ii) a non-terminal hydroxyl group; and (iii) an amide group. In another embodiment, the hydrophilic compound includes (i) a reactive group adapted to covalently bond directly to the polyamide membrane, the reactive group being at least one of a primary amine and a secondary amine; (ii) a hydroxyl group; and (iii) an amide group, the amide group being linked directly to the hydroxyl group by one of an alkyl group and an alkenyl group.Type: GrantFiled: December 19, 2011Date of Patent: July 28, 2015Assignee: WOONGJIN CHEMICAL CO., LTD.Inventors: Ja-Young Koo, Yong-Doo Jung, Sung-Pyo Hong, Yeo-Jin Kim
-
Publication number: 20150108061Abstract: A forward osmosis membrane for seawater desalination and a method for preparing the same. The forward osmosis membrane has a composite membrane structure including a nonwoven fabric layer; a hydrophilic polymer layer; and a polyamide layer. The hydrophilic polymer layer formed on the nonwoven fabric layer facilitates an inflow of water from the feed water to the draw solution to enhance flux and realize high water permeability in the direction of osmosis. The polyamide layer not only secures contamination resistance and chemical resistance but also minimizes the back diffusion of salts of the draw solution in the direction of reverse osmosis. Hence, the forward osmosis membrane of the present invention is greatly useful for desalination of high-concentration seawater.Type: ApplicationFiled: December 24, 2014Publication date: April 23, 2015Applicant: Woongjin Chemical Co., Ltd.Inventors: Sung Dae Chi, Bong Jun Cha, Jong Hwa Lee, Doo Ri Kim, Su Jeong Lim
-
Patent number: 8986832Abstract: Disclosed is an optical-modulation object, including birefringent island-in-the-sea yarns, whose island portions are grouped, based on two or more spinning cores, in a matrix. The optical-modulation object causes formation of an optical modulation interface between island portions and sea portions, thus maximizing optical modulation efficiency, as compared to conventional birefringent island-in-the-sea yarns.Type: GrantFiled: January 26, 2010Date of Patent: March 24, 2015Assignee: Woongjin Chemical Co., Ltd.Inventors: Yeon Soo Kim, Deog Jae Jo, Jin Soo Kim, Do Hyun Kim, In Young Yang
-
Patent number: 8820540Abstract: Method for preparing a filtration membrane and a filtration membrane prepared by the method. According to one embodiment, the method involves casting a polymer solution onto a porous support to form a coated support. The coated support is then quenched to form a membrane/support composite, and the membrane/support composite is then dried. Next, a first end of a first piece of adhesive tape is applied to the membrane side of the composite, and the second end of the first piece of adhesive tape is applied to a first rotatable winder. In addition, a first end of a second piece of adhesive tape is applied to the support side of the composite, and the second end of the second piece of adhesive tape is applied to a second rotatable winder. The two winders are then rotated so as to pull apart the membrane from the support.Type: GrantFiled: January 28, 2011Date of Patent: September 2, 2014Assignee: Woongjin Chemical Co., Ltd.Inventors: Ja-Young Koo, Doowon Lee, Sungpyo Hong
-
Publication number: 20140043786Abstract: A reflective polarizer of the invention has excellent optical properties even though a very small number of polymer components per unit area is disposed inside a matrix thereof compared to reflective polarizers of the related art, which include birefringent polymer, since the polymer inside the matrix has a plate-like shape. This is advantageous for covering the entire range of visible light, since a plate-like polymer having a variety of optical thicknesses can be used. The additional processing of bonding the skin layer is not performed, since the skin layer is formed on at least one surface of the core layer in the state in which it is molten. This can greatly reduce manufacturing costs, and is advantageous in that it maximizes optical properties in a limited thickness.Type: ApplicationFiled: February 7, 2012Publication date: February 13, 2014Applicant: Woongjin Chemical Co., Ltd.Inventors: Duk Jae Cho, Jung Wan Han, Myeong Ki Baek, Hwang Kyu Lee, Seung Jin Ko
-
Patent number: 8353326Abstract: A three-dimensional fabric with three-layered structure is provided. The three-dimensional fabric comprises a surface layer, a backing layer, an intermediate layer, a first interconnection portion for connecting the surface layer and the backing layer, and a second interconnection portion for connecting the intermediate layer and the backing layer. The three-dimensional fabric with three-layered structure can be woven on a single loom in a batch operation and undergo transformation between two-dimensional shape and three-dimensional shape. This fabric is applicable as materials for blinds with high light-shielding rate because intermediate portions have a multi-layered structure.Type: GrantFiled: May 14, 2010Date of Patent: January 15, 2013Assignees: Woongjin Chemical Co., Ltd., Youil Corporation Co., Ltd.Inventors: Hoo-Sung Chang, Il-Sun Ryu
-
Publication number: 20120223007Abstract: The present invention relates to a tubular molded body capable of full-wrapping a membrane module, and an industrial filter assembly using the same. The tubular molded body of the present invention is a molded body consisting of a transparent plastic material and having a constant outer diameter that protects the membrane module through a simple manipulation using a physical fastening means to minimize the space for water stagnation, and prevents the accumulation of Mg2+ and Ca2+ to avoid a rise of the differential pressure caused by contaminants. Furthermore, the present invention provides an industrial filter assembly including a tubular molded body encasing from one end to the other of the membrane module, an industrial facility vessel protecting the exterior of the tubular molded body.Type: ApplicationFiled: September 12, 2011Publication date: September 6, 2012Applicant: WOONGJIN CHEMICAL CO., LTD.Inventors: Jae Hoon Moon, Sung Kyu Kim, Ki Sup Park, Sang Heum Ryu
-
Publication number: 20120211414Abstract: A selective membrane having a high fouling resistance. In one embodiment, the selective membrane is a composite polyamide reverse osmosis membrane having a hydrophilic coating made by covalently bonding a hydrophilic compound to the polyamide membrane, the hydrophilic compound including (i) a reactive group that is adapted to covalently bond directly to the polyamide membrane, the reactive group being at least one of a primary amine and a secondary amine; (ii) a non-terminal hydroxyl group; and (iii) an amide group. In another embodiment, the hydrophilic compound includes (i) a reactive group adapted to covalently bond directly to the polyamide membrane, the reactive group being at least one of a primary amine and a secondary amine; (ii) a hydroxyl group; and (iii) an amide group, the amide group being linked directly to the hydroxyl group by one of an alkyl group and an alkenyl group.Type: ApplicationFiled: December 19, 2011Publication date: August 23, 2012Applicant: WOONGJIN CHEMICAL CO., LTD.Inventors: Ja-Young Koo, Yong-Doo Jung, Sung-Pyo Hong, Yeo-Jin Kim
-
Publication number: 20120043274Abstract: A forward osmosis membrane for seawater desalination and a method for preparing the same. The forward osmosis membrane has a composite membrane structure including a nonwoven fabric layer, a hydrophilic polymer layer, and a polyamide layer. The hydrophilic polymer layer formed on the nonwoven fabric layer facilitates an inflow of water from the feed water to the draw solution to enhance flux and realize high water permeability in the direction of osmosis. The polyamide layer not only secures contamination resistance and chemical resistance but also minimizes the back diffusion of salts of the draw solution in the direction of reverse osmosis. Hence, the forward osmosis membrane of the present invention is greatly useful for desalination of high-concentration seawater.Type: ApplicationFiled: February 9, 2011Publication date: February 23, 2012Applicant: Woongjin Chemical Co., Ltd.Inventors: Sung Dae Chi, Bong Jun Cha, Jong Hwa Lee, Doo Ri Kim, Su Jeong Lim
-
Patent number: 7913857Abstract: A selective membrane having a high fouling resistance. In one embodiment, the selective membrane is a composite polyamide reverse osmosis membrane in which a hydrophilic coating is applied to the polyamide layer of the membrane, the hydrophilic coating being made by covalently bonding a hydrophilic compound to residual acid chlorides of the polyamide membrane, the hydrophilic compound including (i) at least one reactive group that is adapted to covalently bond directly to the polyamide membrane, the at least one reactive group being at least one of a primary amine and a secondary amine; and (ii) at least one non-terminal hydroxyl group.Type: GrantFiled: February 6, 2007Date of Patent: March 29, 2011Assignee: Woongjin Chemical Co., Ltd.Inventors: Ja-Young Koo, Sung Pyo Hong, Jong Hwa Lee, Kwan Young Ryu
-
Publication number: 20100317248Abstract: Fabrics including a low-melting fiber are provided. In an embodiment, the fabric includes a regular fiber and a low-melting fiber. The low-melting fiber is directly included in either warps or wefts or both. Alternatively, a blended or plied fiber of the regular fiber and the low-melting fiber is included in either warps or wefts or both. The low-melting fiber has a fusion rate of 30 to 100%. The fabric has a yarn slip length of 0.1 to 2.5 mm.Type: ApplicationFiled: May 28, 2010Publication date: December 16, 2010Applicant: WOONGJIN CHEMICAL CO., LTD.Inventors: Hoo-Sung CHANG, Sung-Gun Kim
-
Publication number: 20100288449Abstract: A three-dimensional fabric with three-layered structure is provided. The three-dimensional fabric comprises a surface layer, a backing layer, an intermediate layer, a first interconnection portion for connecting the surface layer and the backing layer, and a second interconnection portion for connecting the intermediate layer and the backing layer. The three-dimensional fabric with three-layered structure can be woven on a single loom in a batch operation and undergo transformation between two-dimensional shape and three-dimensional shape. This fabric is applicable as materials for blinds with high light-shielding rate because intermediate portions have a multi-layered structure.Type: ApplicationFiled: May 14, 2010Publication date: November 18, 2010Applicants: Woongjin Chemical Co., Ltd., Youil Corporation Co., Ltd.Inventors: Hoo-Sung CHANG, Il-Sun Ryu
-
Publication number: 20100218841Abstract: A three-dimensional multilayer fabric is provided. The fabric comprises a surface layer, a backing layer, and an intermediate layer connecting the surface layer and the backing layer. The intermediate layer has a multi-layered structure where a multiple of a fabric is separated each other. The three-dimensional multilayer fabric can be woven on a single loom in a batch operation and undergo transformation between two-dimensional shape and three-dimensional shape. This fabric is applicable as materials for blinds with high light-shielding rate because intermediate portions have a multi-layered structure.Type: ApplicationFiled: February 12, 2010Publication date: September 2, 2010Applicants: WOONGJIN CHEMICAL CO., LTD., YOUIL CORPORATION CO., LTD.Inventors: Hoo-Sung CHANG, Il-Sun RYU
-
Publication number: 20100151756Abstract: Screen fabrics are provided. In an embodiment, the screen fabric includes a regular fiber and a dope dyed fiber. The dope dyed fiber is directly included in either warps or wefts or both. Alternatively, a blended or plied fiber of the regular fiber and the dope dyed fiber is included in either warps or wefts or both. Differences in the lightness, chroma and hue of the screen fabric before and after post-processing are ±2 or less, ±2 or less and ±0.1 or less, respectively.Type: ApplicationFiled: December 10, 2009Publication date: June 17, 2010Applicant: WOONGJIN CHEMICAL CO., LTD.Inventor: Sung-Gun KIM
-
Publication number: 20100116731Abstract: Disclosed therein is a reverse osmosis water purifier having a simple filter configuration, which includes filter parts consisted of a sediment-filter, a chlorine-resistant polyamide composite membrane and a post-carbon-filter. The reverse osmosis water purifier can be designed in slim size by omitting a pre-carbon-filter, and provide drinking water of good quality since a portion of the residual chlorine in the feed water pass through the chlorine-resistant polyamide composite membrane to the downstream of said membrane and the residual chlorine can inhibit an adventitious growth of microorganism in the post-carbon-filter or the purified-water tank.Type: ApplicationFiled: November 6, 2009Publication date: May 13, 2010Applicant: Woongjin Chemical Co., Ltd.Inventors: Jeong-Yul Kim, Sang-Ok Moon, Sung-Pyo Hong, Yong-Doo Jung
-
Patent number: 7694696Abstract: A three-dimensional multilayer fabric is provided. The fabric comprises a surface layer, a backing layer, and an intermediate layer connecting the surface layer and the backing layer. The surface layer includes sequential unstitched surface portions and sequential stitched surface portions formed in an alternating and repeating pattern. The unstitched surface portions of the surface layer are essentially composed of surface warp threads only, and the stitched surface portions of the surface layer are composed of the surface warp threads and intermediate warp threads. The backing layer includes sequential unstitched backing portions and sequential stitched backing portions formed in an alternating and repeating pattern. The unstitched backing portions of the backing layer are essentially composed of backing warp threads only, and the stitched backing portions of the backing layer are composed of the backing warp threads and the intermediate warp threads.Type: GrantFiled: April 11, 2008Date of Patent: April 13, 2010Assignees: Woongjin Chemical Co., Ltd., Youil Corporation Co., Ltd.Inventors: Hoo-Sung Chang, Il-Sun Ryu
-
Publication number: 20090288731Abstract: A three-dimensional multilayer fabric is provided. The fabric comprises a surface layer, a backing layer, and an intermediate layer connecting the surface layer and the backing layer. The surface layer includes sequential unstitched surface portions and sequential stitched surface portions formed in an alternating and repeating pattern. The unstitched surface portions of the surface layer are essentially composed of surface warp threads only, and the stitched surface portions of the surface layer are composed of the surface warp threads and intermediate warp threads. The backing layer includes sequential unstitched backing portions and sequential stitched backing portions formed in an alternating and repeating pattern. The unstitched backing portions of the backing layer are essentially composed of backing warp threads only, and the stitched backing portions of the backing layer are composed of the backing warp threads and the intermediate warp threads.Type: ApplicationFiled: April 11, 2008Publication date: November 26, 2009Applicant: WOONGJIN CHEMICAL CO, LTDInventors: Hoo-Sung Chang, ll-Sun Ryu