Patent application number | Description | Published |
20120296078 | ACETYLATED CELLULOSE ETHER AND ARTICLES COMPRISING THE SAME - Acetylated cellulose ether and an article including the same. The acetylated cellulose ether has a degree of substitution (DS) of alkyl group of 1 to 2, a molar substitution (MS) of hydroxyalkyl group of 0 to 1, and a degree of substitution (DS) of acetyl group of 1 to 2. | 11-22-2012 |
20140288261 | CATALYST FOR SYNTHESIZING POLYESTER RESIN AND METHOD OF MANUFACTURING POLYESTER RESIN USING THE SAME - A catalyst used to manufacture a biodegradable polyester resin, in particular, an organic titanium catalyst which does not contain a heavy-metal component, and a method of manufacturing a polyester resin using the same. Accordingly, the method of manufacturing a polyester resin can be useful in attaining desired physical properties without using a catalyst harmful to environments and a human body. The biodegradable resin, which can be safely used in the field of applications in which the use of harmful components is a sensitive issue without using the components harmful to environments and a human body during the manufacture of a resin, can be prepared. | 09-25-2014 |
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 |
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 |
20160090443 | BIODEGRADABLE POLYESTER RESIN AND ARTICLE CONTAINING THE SAME - Provided are a biodegradable polyester resin and an article including the resin. The provided biodegradable polyester resin includes an aliphatic dicarboxylic acid residue including a succinic acid residue and an adipic acid residue; and an aliphatic diol residue including at least one selected from the group consisting of an ethylene glycol residue and a butanediol residue in order to improve biodegradability and flexibility. | 03-31-2016 |