Microbial collapsible thermoplastics moldings and its production manner

摘要

PURPOSE:To obtain a molded item of resin capable of breaking microorganism and also having excellent mechanical property and secondary workability by using aliphatic polyester resin as matrix resin and mixing and dispersing thermoplastic resin in said matrix at a predetermined ratio. CONSTITUTION:Aliphatic polyester resins are polycondensation product of polyhydric carboxylic acid and polyhydric alcohol, polycondensation product of hydroxy acid and ring-opening polymerization product of lactone, which are hydrolyzed by the action of lipase. Thermoplastic resins are those of olefin, styrene, vinyl, acryl, amide, etc. A mixture of 25-60wt.% of said aliphatic polyester and 75-40wt.% of thermoplastic resins is extruded under conditions satisfying the formulas I, II. Extrusion is difficult to perform where etaA500 and both the components are not sufficiently mixed where etaB/etaA=10 and molded items wherein polyester resin is used as matrix cannot be obtained where etaB/etaA1. Conditions which satisfy the formulas can be provided by suitably selecting molecular weights of resins used and components and compositions of aliphatic polyesters and thermoplastic resins.