Patent application number | Description | Published |
20130202223 | BIODEGRADABLE RESIN AND METHOD FOR MANUFACTURING SAME - Provided is a biodegradable resin including a urethane bond generated by a reaction of a polyester polymer with a polyvalent isocyanate used as a chain extender. Particularly, provided is a method of preparing a biodegradable resin using a limited amount of the chain extender and having excellent properties, and a biodegradable resin in which nitrogen content is controlled. Therefore, the biodegradable resin which can reduce the use of a harmful component to the human body and environment in the process of preparing the biodegradable resin and can be safely used for packing materials for food or medicine is provided. | 08-08-2013 |
20140121332 | PRODUCTION METHOD FOR BIODEGRADABLE POLYESTER COPOLYMER RESIN - There is provided a production method for a biodegradable resin using a relatively inexpensive compound as an aromatic dicarboxylic acid compound, wherein, during the process of producing a biodegradable resin in the form of an aliphatic-aromatic polyester copolymer, an aliphatic dihydroxyl compound used as a starting material is used in an amount of between 1 and 1.5 equivalent weight with respect to aliphatic and aromatic dicarboxylic acid compounds. The present invention includes the steps of: causing a hydroxyl group of the aliphatic dihydroxyl compound to undergo a first reaction with a carboxyl group of the aliphatic dicarboxylic acid compound; and causing the residual hydroxyl group of the aliphatic dihydroxyl compound to undergo a second reaction with a carboxyl group of the aromatic dicarboxylic acid compound. The present invention has the advantage that it is possible to produce the aliphatic-aromatic polyester copolymer biodegradable resin by means of an efficient method while not detracting from the mechanical properties of the biodegradable resin. | 05-01-2014 |
20140134380 | BIODEGRADABLE RESIN COMPOSITION, AND DRAINING BOARD CORE MATERIAL AND DRAINING BOARD PRODUCED THEREFROM - A biodegradable resin composition is provided. More particularly, a biodegradable resin composition for a core of a drain board, which has excellent extrusion productivity and thus improves productivity by improving physical properties, for example, reducing contractibility and elasticity recovery, according to original characteristics of a biodegradable resin without degradation in biodegrability of the biodegradable resin by mixing the biodegradable resin with an additional material for improving processibility in suitable amounts, a core of a drain board using the same, and a method of manufacturing a drain board. | 05-15-2014 |
20150119481 | RESIN COMPOSITION FOR FOAMING CONTAINING BIODEGRADABLE RESIN, AND FOAM MANUFACTURED THEREFROM - There are provided a resin composition for foaming including a biodegradable resin and a foamed article made thereof. The resin composition for foaming according to the present invention includes an ethylene-vinyl acetate resin, a biodegradable polyester resin containing a monomer of a double bond compound, a cross-linking agent, a co-crosslinking agent, a filler, and a foaming agent. In the resin composition, the double bond in the biodegradable polyester resin can be chemically cross-linked to the ethylene-vinyl acetate resin by a cross-linking agent, so that a compatibility with the ethylene-vinyl acetate resin can be improved, processability (mold releasability) during a mixing and melting process can be improved, and a foaming property and a mechanical property of a foamed article can be remarkably improved. | 04-30-2015 |
20150152218 | METHOD FOR MANUFACTURING BIODEGRADABLE COPOLYMER BY SPLIT-INJECTING AROMATIC DICARBOXYLIC ACID COMPOUND - There is provided a method of preparation for a biodegradable co-polyester, the method including: forming an oligomer through a primary esterification reaction between a hydroxy group of an aliphatic dihydroxy compound and a carboxylic group of an aliphatic dicarboxylic acid compound; performing a secondary esterification reaction between the formed oligomer and an aromatic dicarboxylic acid compound; and performing a polycondensation reaction in a vacuum, in which sequentially divided addition of the aromatic dicarboxylic acid compound is performed and the weight ratio of the aromatic dicarboxylic acid compound with respect to the oligomer for each time of the sequentially divided addition is from 2:8 to 5:5. The method efficiently increases a solubility of aromatic dicarboxylic acid, thereby increasing a reaction rate and reducing a side reaction. | 06-04-2015 |
20150158974 | METHOD FOR PREPARING BIODEGRADABLE ALIPHATIC-AROMATIC POLYESTER COPOLYMER RESIN WITH IMPROVED HYDROLYSIS RESISTANCE - There is provided a method of preparation for a biodegradable co-polyester resin with improved hydrolysis resistance, the method including performing a primary esterification reaction between an aliphatic dihydroxy compound and an aliphatic dicarboxylic acid compound, and performing a secondary transesterification reaction with addition of an aromatic dicarboxylate after the primary esterification reaction, in which a short chain alcohol-type branching agent is added to the primary esterification reaction or to the secondary transesterification reaction. In the method of the present invention, the slow esterification reaction caused by acid is performed first and the aromatic dicarboxylate compound without acidity is added thereto, thereby efficiently controlling a non-reactant or a partial-reactant affecting an acid value of a product during the reaction, so that an acid value can be controlled and hydrolysis resistance can be improved without using an excessive amount of expensive BDO, an reaction of an excessive amount of a chain extender, or using an expensive anti-hydrolysis agent. Further, by minimizing an amount of the branching agent used herein, tear strength can be improved. | 06-11-2015 |
Patent application number | Description | Published |
20150183927 | METHOD FOR CONTINUOUSLY PREPARING BIODEGRADABLE ALIPHATIC/AROMATIC POLYESTER COPOYMER - Provided is a method of continuous preparation of a biodegradable aliphatic/aromatic polyester copolymer, the method including: performing a first esterification reaction of an aliphatic dihydroxy compound and an aliphatic dicarboxylic acid at a temperature of 185° C. or less; continuously performing a second esterification reaction of a reaction product obtained by the first esterification reaction; obtaining a pre-polymer by continuously performing a first polycondensation reaction of a reaction product obtained by the second esterification reaction; and continuously performing polycondensation reaction of the pre-polymer, wherein an aromatic carboxylic acid is added to a reactor in which the first esterification reaction or the second esterification reaction is performed, to prepare the biodegradable aliphatic/aromatic polyester copolymer. According to the method of continuous preparation of the biodegradable aliphatic/aromatic polyester copolymer as described above, the amount of the aliphatic dihydroxy compound used, which is a starting material, is reduced and accordingly, manufacturing costs are reduced. | 07-02-2015 |
20150252142 | METHOD FOR CONTINUOSLY PREPARING BIODEGRADABLE ALIPHATIC POLYESTER - Provided is a method of continuous production of a biodegradable aliphatic polyester including continuously performing an esterification reaction of a mixture including an aliphatic dihydroxy compound and aliphatic dicarboxylic acid at a temperature of 185° C. or less to obtain an ester; continuously performing a first polycondensation reaction of the ester to obtain a preliminary polymer; and continuously performing a polycondensation reaction of the preliminary polymer. According to the method of production, an amount of the aliphatic dihydroxy compound used decreases, which is a starting material, thereby decreasing the manufacturing cost of the biodegradable aliphatic polyester. | 09-10-2015 |
20150291731 | METHOD FOR PREPARING BIODEGRADABLE POLYESTER COPOLYMER AND POLYESTER COPOLYMER PREPARED THEREBY - The present invention provides a method of preparing a polyester-based polymer and a polyester-based polymer prepared by the method. The method of preparing the polyester-based polymer includes a prepolymerization step of polymerizing a dicarboxylic acid compound (A), a diol compound (B), and a carbodiimide compound (C) at 160-220° C. to produce a prepolymer; and a condensation polymerization step of performing a condensation polymerization of the prepolymer at 200-250° C., under a vacuum pressure of 0.1 to 2 Torr. | 10-15-2015 |
20150299384 | METHOD FOR PREPARING BIODEGRADABLE POLYESTER COPOLYMER - The present invention provides a method of preparing a polyester-based polymer and a polyester-based polymer prepared by the method. The method of preparing the polyester-based polymer includes a prepolymerization step of polymerizing a dicarboxylic acid compound (A), a diol compound (B), and an aromatic branching agent (C) at 160-220° C. to produce a prepolymer; and a condensation polymerization step of performing a condensation polymerization of the prepolymer at 200-250° C., under a vacuum pressure of 0.1 to 2 Torr. | 10-22-2015 |
20150307657 | METHOD FOR CONTINUOUS PRODUCTION OF BIODEGRADABLE ALIPHATIC/AROMATIC POLYESTER COPOLYMER - A continuous preparation method of a biodegradable aliphatic/aromatic polyester copolymer includes: performing a first esterification reaction of an aliphatic dihydroxy compound with an aliphatic dicarboxylic acid at a temperature of 185° C. or less; continuously performing a second esterification reaction of a reaction product from the first esterification reaction; continuously performing a first polycondensation reaction of a reaction product from the second esterification reaction to obtain a prepolymer; continuously performing a second polycondensation reaction of the prepolymer to obtain a second polycondensation reaction product having an intrinsic viscosity from about 0.9 dl/g to about 1.0 dl/g; and continuously performing a third polycondensation reaction of the second polycondensation reaction product to prepare the biodegradable aliphatic/aromatic polyester copolymer, wherein the performing of the first esterification reaction or the continuously performing of the second esterification reaction includes adding an aromatic carboxylic acid. The biodegradable aliphatic/aromatic polyester copolymer prepared by control of the intrinsic viscosity of the second polycondensation reaction product may be improved in processibility, film formability, tensile/tearing strength, and blending ability with another polymer resin. Use of a less amount of the aliphatic dihydroxy compound as a starting material may reduce manufacturing costs. | 10-29-2015 |
20150315334 | METHOD FOR CONTINUOUS PRODUCTION OF BIODEGRADABLE ALIPHATIC/AROMATIC POLYESTER COPOLYMER - A continuous preparation method of a biodegradable aliphatic/aromatic polyester copolymer includes: performing a first esterification reaction of an aliphatic dihydroxy compound with an aliphatic dicarboxylic acid at a temperature of 185° C. or less; continuously performing a second esterification reaction of a reaction product from the first esterification reaction; continuously performing a first polycondensation reaction of a reaction product from the second esterification reaction to obtain a prepolymer; continuously performing a second polycondensation reaction of the prepolymer to obtain a second polycondensation reaction product having a melting index from about 15 g/10 min to about 25 g/10 min; and continuously performing a third polycondensation reaction of the second polycondensation reaction product to prepare the biodegradable aliphatic/aromatic polyester copolymer, wherein the performing of the first esterification reaction or the continuously performing of the second esterification reaction includes adding an aromatic carboxylic acid. | 11-05-2015 |
20150315335 | METHOD FOR CONTINUOUS PRODUCTION OF BIODEGRADABLE ALIPHATIC/AROMATIC POLYESTER COPOLYMER - A continuous preparation method of a biodegradable aliphatic/aromatic polyester copolymer includes: performing a first esterification reaction of an aliphatic dihydroxy compound with an aliphatic dicarboxylic acid at a temperature of 185° C. or less; continuously performing a second esterification reaction of a reaction product from the first esterification reaction; continuously performing a first polycondensation reaction of a reaction product from the second esterification reaction to obtain a prepolymer having a weight average molecular weight of about 6,900 to about 14,000; continuously performing a second polycondensation reaction of the prepolymer to obtain a second polycondensation reaction product; and continuously performing a third polycondensation reaction of the second polycondensation reaction product to prepare the biodegradable aliphatic/aromatic polyester copolymer, wherein the performing of the first esterification reaction or the continuously performing of the second esterification reaction includes adding an aromatic carboxylic acid. The biodegradable aliphatic/aromatic polyester copolymer prepared by the continuous method may be improved in processibility, film formability, tensile/tearing strength, and blending ability with another polymer resin. Use of a less amount of the aliphatic dihydroxy compound as a starting material may reduce manufacturing costs. | 11-05-2015 |