| abstract |
A composition for production of cover packing, comprising: n (A) a blocked isocyanate, n (B) an active hydrogen group-containing compound having average two or more functional groups, n (C) an organic substance powder having an average particle diameter of 40 to 250 μm, and n (D) an inorganic substance powder having an average particle diameter of less than 40 μm; and a method for production of cover packing using the composition. n With this composition which is a one-pack type, curable composition, no apparatus for mixing the main material and the curing agent is required; by heating, dissociation of blocking agent and completion of reaction are allowed to take place simultaneously; and a cover packing superior in mechanical strength, etc. can be formed. Further with the composition, there is no need of using a high-performance, high-pressure pump or a mold of good sealing; curing takes place in several minutes after mixing at a mold temperature; the cured material is releasable from the mold despite of the small hardness; and superior discharging, lining and driplessness are obtained. |