GREAT EASTERN RESINS INDUSTRIAL CO., LTD. Patent applications |
Patent application number | Title | Published |
20130079542 | PROCESSES FOR PRODUCING ARYL CARBAMATES, ISOCYNATES AND POLYUREAS USING DIARYL CARBONATE - A preparation of aryl carbamates can be achieved readily by carbonylation of an aromatic polyamine compound with diphenyl carbonate (DPC) using a combination of an organic acid and a tertiary amine as a catalyst. Aryl carbamate can be converted into 4,4′-diphenylmethane diisocyanate (MDI) by heating it at about 200 to about 230° C. in a non-polar solvent containing inhibitor such as benzoyl chloride. In another application, trans-ureation of biscarbamates with an amine or mixed amines is found to be extremely facile in a polar solvent such as dimethyl sulfoxide (DMSO) and tetramethylene sulfone (TMS) in absence of any catalyst to make polyurea polymers of high molecular weights. Thus, efficient green-chemistry processes based on biscarbamates in making isocyanate products as well as urea prepolymers, urea elastomers and urea plastics have been developed in all in excellent yields without using reactive phosgene or 4,4′-diphenylmethane diisocyanate separately in the trans-ureation polymerizations. | 03-28-2013 |
20120201973 | PRIMER COMPOSITION FOR CURED SILICON-CONTAINING SURFACE AND ITS USES - A method for improving an adhesion of an adhesive to a cured silicon-containing surface is provided. The method comprises applying a primer composition to the surface before applying the adhesive; and subjecting the surface to a plasma treatment before or after the composition is applied thereto; wherein the primer composition comprises a polar organic solvent, an acrylic monomer, and an amino-containing silane. | 08-09-2012 |
20120108742 | Biodegradable and biocompatible waterborne polyurethane - The present invention relates to a waterborne polyurethane containing biodegradable segments and the process for synthesizing the same. The waterborne polyurethane according to the present invention has excellent biodegradable, biocompatible and mechanical characteristics and thus is a useful biomedical material, in particular for making films for medical applications. | 05-03-2012 |
20100151144 | PRIMER COMPOSITION FOR CURED SILICON-CONTAINING SURFACE AND ITS USES - A primer composition for a cured silicon-containing surface and its uses are provided. The composition comprises a polar organic solvent, an acrylic monomer, and an amino-containing silane having a formula of (R | 06-17-2010 |
20090192283 | PROCESS FOR PREPARING HIGH PERFORMANCE WATERBORNE ALIPHATIC-AROMATIC MIXED POLYURETHANES - The present invention relates to an improved process for preparing high performance aliphatic-aromatic mixed waterborne polyurethanes (PUs). Waterborne PUs prepared from mixed aromatic diisocyanates and aliphatic diisocyanates exhibit superior mechanical properties as compared with those prepared from aliphatic diisocyanates alone. | 07-30-2009 |
20090012242 | SYNTHESIS OF POLYIMIDES (PI) FROM POLY-CARBODIIMIDES AND DIANHYDRIDES BY SEQUENTIAL SELF-REPETITIVE REACTION (SSRR) - Disclosed are processes for synthesizing polyimides by a sequential self-repetitive reaction between poly (aryl carbodiimide) (p-CDI) or aryl diisocyanates with dianhydrides. | 01-08-2009 |