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OwnerMasaharu Takada, Shinji Ochi +1inventors
InventorsMasaharu Takada, Shinji Ochi, Shinji Okuda
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The present invention provides one-pack type curing paste material to be used in a method of mechanically mixing and dispersing a low-pressure gas into a paste material to produce an expandable material, followed by discharging and expanding the expandable material to produce a curable product, especially a cured product with dense uniform closed-cells by using a mechanical foaming apparatus suitable for performing of the method. The one-pack type curing paste material of the present invention has viscosity characteristics included in the zone defined by points A, B, C and D in the graph of FIG. 1 showing the relationship between shear rate and apparent viscosity, said points A and B being at 50-30000 poises of an apparent viscosity (measured by a Brookfield rotary viscometer using spindle No.7, at 2 rpm, at 20° C.) in low shear rate region (0.43 sec−1) and said points C and D being at 20-2000 poises of an apparent viscosity (measured by an apparent viscosity meter according to JIS K2220, at 20° C.) in high shear rate region (783 sec−1).
In a method of mechanically mixing and dispersing a paste material and a low-pressure gas to produce an expandable material, followed by discharging and expanding the expandable material to produce a cured product, wherein the improvement comprises using as the paste material a one-pack type curing paste material having viscosity characteristics included in the zone defined by points A, B, C and D in the graph of FIG. 1 showing the relationship between shear rate and apparent viscosity, said points A and B being at 50-30000 poises of an apparent viscosity (measured by a Brookfield rotary viscometer using spindle No.7, at 2 rpm, at 20° C.) in low shear rate region (0.43 sect−1) and said points C and D being at 20-2000 poises of an apparent viscosity (measured by an apparent viscosity meter according to JIS K2220, at 20° C.) in high shear rate region (783 sec−1), and mechanically mixing and dispersing the one-pack type curing material and a low-pressure gas, followed by discharging and expanding the resulting expandable material to produce a cured product with dense uniform closed-cells.
Dependencies are inferred from the claim text.