| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject composition exhibiting excellent anti-sagging effect, continuous extrudability, low price and setting resistance, and useful for e.g. lighting fixtures, by mixing use of each specific principal agent liquor and curing agent liquor as the two components in specific proportions. SOLUTION: This sealant composition is composed of (A) a principal agent liquor comprising (A1 ) a polyol, (A2 ) a thixotropy-imparting agent, and a catalyst and a foaming agent, and (B) a curing agent liquor. The usage of this composition is as follows: the components A and B are mixed together using a mixing extruder in weight and molar ratios B/A of (5-100):100 and (0.8-1.2):1, respectively, and the resulting mixture is extruded to a member sealing part to effect curing along with expansion. In this case, the component A1 is a mixture of (A1 <1> ) a polyether polyol 15-70 (mmg/KOH) in OH number and 2.1-3 in average functional group number and (A1 <2> ) a polyether-based polymer polyol 15-70 in OH number prepared by graft polymerization between styrene and acrylonitrile in a weight ratio A1 <1> /A1 <2> of (90:10) to (70:30), while the component A2 is surface- treated calcium carbonate 0.03-0.15μm in primary particle size, its amount to be used being 15-45 pts.wt. based on 100 pts.wt. of the component A1 .
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