LACTIC ACID BASED POLYESTER LAMINATE PAPER

• Main Authors: KAKIZAWA YASUTOSHI, FURUTA HIDEYUKI
• Format: Patent
• Language: English
• Published: 19.11.1996
• Edition: 6
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; IMPREGNATING OR COATING OF PAPER; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PERFORMING OPERATIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

PURPOSE: To manufacture a laminate paper suitable for the regeneration of waste paper by the constitution of lactic acid based polyester, having the specified range of weight average molecular weight containing the structural unit formed by the dehydration condensation of lactic acid and polyester structural unit formed by the dehydration condensation of dicarboxylic acid and diol, and a specific range of the melting point measured by DSC, and paper. CONSTITUTION: As lactic polyester to be used is of superior resistance and shaping properties, the weight average molecular weight of 20,000-400,000 is preferable, and the melting point measured by DSC is in the range of 70-20 deg.C. As for a polymerizing agent, preferably polyvalent carboxylic acid, an epoxy compound, isocyanate or the like is used alone or as a mixture. The adding amount of the polymerizing agent is preferably in the range of 0.001-5 pts.wt. to the total amount of the structural unit formed by the dehydration condensation of lactic acid and the polyester structural unit formed by dicarboxylic acid and diol. As for the use of a laminate paper, it is suitable for packaging food, as it is provided with superior flexibility, resistance to oils and stability. The laminate paper is also provided with hydrolyzing properties and biodegradability, and decomposed by hydrolysis, microbes and the like when it is thrown away into earth or sea water after use.