STYRENIC RESIN EXPANDABLE PARTICLE, METHOD FOR PRODUCING THE SAME AND STYRENIC RESIN EXPANSION MOLDED PRODUCT

• Main Authors: YAMAMOTO SHINICHI, KOBAYASHI HIDEKI, TAKENAKA YOSHIKAZU, SUNAKAWA YASUYUKI, MAEDA TAMAO, SASAKI HIDEAKI
• Format: Patent
• Language: English
• Published: 05.04.2007
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; MAKING GRANULES OR PREFORMS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

PROBLEM TO BE SOLVED: To effectively treat a waste resin of a molded product composed of a cyclic polyolefinic resin in a state of a low environmental load not by an incineration treatment. SOLUTION: A base resin of expandable particles is composed of a mixed resin of the waste resin of the molded product composed of 70-97 mass% of a styrenic resin and 3-30 mass% of the cyclic polyolefinic resin. The waste resin converted into fine particles having preferably ≤5 μm, more preferably <3 μm particle major axis is dispersed in the styrenic resin. A volatile foaming agent is contained in the base resin. The expansion molded product molded by using the styrenic resin expandable particles exhibits physical properties comparable to those of the expansion molded product molded by using the styrenic resin expandable particles in which 100 mass% of the base resin is the styrenic resin. COPYRIGHT: (C)2007,JPO&INPIT