| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a two-part curing polyol composition for a foamed grindstone, capable of producing the grindstone useful for grinding a precision product, such as a glass product and a semiconductor silicon product, capable of stably producing a molded product for the foamed grindstone by a two-part liquid mixing cast-molding machine, capable of producing the urethane foamed grindstone having excellent mechanical characteristics and uniform density distribution, and having excellent dissolving stability. <P>SOLUTION: This two-part curing polyol composition for the foamed grindstone is formed by uniformly dissolving (A) a mixture of polyaminochlorophenylmethane compounds in (B) a polyol in a weight ratio of the component (A) to the component (B) [(A)/(B)] of 30/70 to 60/40, wherein the mixture comprises a dinuclear polyaminochlorophenylmethane compound expressed by formula in an amount of 50-70 wt%, a trinuclear polyaminochlorophenylmethane compound expressed by formula in an amount of 20-40 wt%, and a tetranuclear or more higher polynuclear polyaminochlorophenylmethane compound expressed by formula in an amount of 5-10 wt%. A two-part curing composition for the foamed grindstone, the foamed grindstone, and a method for producing the foamed grindstone are provided by using the two-part curing polyol composition, respectively. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
