Composition for production of cover packing and process for production of cover packing using the same

Abstract

A composition for production of cover packing, comprising: (A) a blocked isocyanate, (B) an active hydrogen group-containing compound having average two or more functional groups, (C) an organic substance powder having an average particle diameter of 40 to 250 μm, and (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. 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.

Dependencies are inferred from the claim text.