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 |
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 |
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 |