발포성 수지조성물, 이들 조성물을 사용한 열가소성 발포 패턴 및 금속 주조물의 제조방법

• Format: Patent
• Language: Korean
• Published: 21.10.1992
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CASTING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; FOUNDRY MOULDING; GENERAL PROCESSES OF COMPOUNDING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; POWDER METALLURGY; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

내용 없음 Disclosed are a foamable resin composition which comprises a copolymer with a weight-average molecular weight of 150,000-350,000 produced by copolymerization of a monomer mixture of 55-85% by weight of styrene and 45-15% by weight of a methacrylic acid ester represented by general formula (I) CH2=C(CH3)COOR(I) (wherein R represents a C1-4 alkyl group) and, having impregnated therein, 10% by weight or less of a foaming agent relative to said monomer mixture, a thermoplastic foamable pattern which is constituted by heating, foaming and molding of a foamable resin composition as claimed in claim 1, a metal casting manufacturing method which comprises a stage wherein a thermoplastic foamable pattern as claimed in claim 9 is especially surrounded by refractory material and a stage wherein molten metal is poured into said pattern in order to eliminate said pattern and, as the result of solidification of said metal, form a casting as a reproduction of said pattern, and a metal casting manufacturing method which comprises a stage wherein a thermoplastic foamable pattern as claimed in claim 9 is especially surrounded by refractory material, a stage wherein said pattern is eliminated to form a space, a stage wherein molten metal is poured into said space and a stage wherein a casting is formed as a reproduction of said pattern by solidification of said metal.