C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 212/08 (2006.01) B22C 7/02 (2006.01) B22C 9/04 (2006.01) C08F 220/12 (2006.01) C08J 9/06 (2006.01) C08J 9/14 (2006.01) C08J 9/20 (2006.01)
Patent
CA 2063464
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.
Graham Nigel K.
Kato Yoshiyuku
Shibata Hideaki
Simmons William
Foseco International Ltd.
Hitachi Chemical Co. Ltd.
Jsp Corporation
Sim & Mcburney
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