EXTRUDED PROPYLENE RESIN FOAM AND PROCESS FOR PRODUCTION THEREOF

• Main Authors: SUGAWARA, MINORU, TSUNORI, RYOICHI, OTSUKI, YASUHIKO
• Format: Patent
• Language: English; French; Japanese
• Published: 28.09.2006
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

An extruded propylene resin foam obtained by extrusion-foaming a propylene resin and having a closed cell content of less than 40% and an expansion ratio of 10 or above. The foam has open -cell structure due to moderate breakage of cells and a high expansion ratio, so that the cells of the foam each exert sound absorbing characteristics. Thus, the foam is excellent in sound absorbing characteristics. Mousse extrudée en résine de propylène obtenue en extrudant en mousse une résine de propylène, contenant moins de 40% de cellules fermées et ayant un coefficient d'expansion de 10 ou plus. La mousse présente une structure de cellules ouvertes en raison d'une rupture modérée des cellules et d'un coefficient d'expansion élevé, et les cellules de la mousse ont donc chacune des propriétés d'absorption du son. Ainsi, la mousse présente d'excellentes propriétés d'absorption du son.