JPH0441696B

PURPOSE:To obtain a high-MW polyglycolide inexpensively, by polycondensing glycolic acid in the presence of a catalyst and adding liquid paraffin to the reaction system after reaching a specified MW. CONSTITUTION:Glycolic acid is polycondensed at 150-250 deg.C in the presence of 0.01-1.0wt%, based o...

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Hauptverfasser:	OKADA TAKAO, FUKUZAKI HIRONOBU
Format:	Patent
Sprache:	eng
Schlagworte:	AGRICULTURE ANIMAL HUSBANDRY BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES, AS HERBICIDES CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES CHEMISTRY COMPOSITIONS BASED THEREON DISINFECTION, STERILISATION, OR DEODORISATION OF AIR FISHING FORESTRY HUMAN NECESSITIES HUNTING HYGIENE MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES MEDICAL OR VETERINARY SCIENCE METALLURGY METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL ORGANIC MACROMOLECULAR COMPOUNDS PEST REPELLANTS OR ATTRACTANTS PLANT GROWTH REGULATORS PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTSTHEREOF THEIR PREPARATION OR CHEMICAL WORKING-UP TRAPPING
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain a high-MW polyglycolide inexpensively, by polycondensing glycolic acid in the presence of a catalyst and adding liquid paraffin to the reaction system after reaching a specified MW. CONSTITUTION:Glycolic acid is polycondensed at 150-250 deg.C in the presence of 0.01-1.0wt%, based on the acid, catalyst (e.g., stannous chloride). When the MW of the condensate reaches 2,000-6,000 after about 2-10hr from the start of the reaction, 5-30wt%, based on the acid, liquid paraffin is added to the reaction system and the reaction is further continued for about 1-20hr. This process is useful also for the production of a polylactide from lactic acid.