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US 4,352,914 AGranted
Binder composition for foundry sand molds and cores
AssigneeMitsubishi Petrochemical Co., Ltd.
InventorTakeshi Tobinaga
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Abstract
A novel binder composition for foundry sand molds or cores comprises (a) an organic polyisocyanate compound and (b) a certain polyol compound selected from a formaldehyde-modified bisphenol and a formaldehyde-modified cyclic ketone, or a partially alkoxylated derivative of the polyol compound, the ratio of the component (a) to the component (b) being in the specific range.
Claims11
A binder composition for foundry sand molds or cores comprising:
- (a) component (a) which is an organic polyisocyanate compound;
- and
- (b) component (b) which is a compound selected from the group consisting of (i) a polyol compound obtained by the reaction of formaldehyde with a compound selected from bisphenols, cyclic ketones in each of which both of the carbon atoms adjacent to the carbonyl group have a total of at least two hydrogen atoms, and mixtures thereof, and (ii) a derivative of the polyol compound (i) which is a reaction product of a polyol compound (i) and a monohydric alcohol,
- wherein the quantitative ratio of the component (a) to the component (b) is such that the isocyanate group of the component (a) is present in the range of 0.3 to 3 equivalents per equivalent of the hydroxyl group of the component (b) and the degree of alkoxylation of the methylol groups of the component (ii) is 10% to 60%.
1 more element
Dependencies are inferred from the claim text.