| 摘要 |
<p>Abstract: A sealing material which does not sag after application and shows excellent sealing performance even under severe high-temperature conditions. Even when used with foaming, the sealing material can form satisfactory closed cells therein. Also provided is a method of foaming application of the sealing material. The sealing material is characterized by comprising an ultraviolet-curable ingredient and an ultraviolet-polymerizable initiator, the content of any thermoplastic elastomer not curable with ultraviolet in the material being 5 wt.% or lower. It is further characterized in that the ultraviolet-curable ingredient comprises an acrylate which gives an ultraviolet-cured polymer having a glass transition temperature and a weight-average molecular weight in respective certain ranges, and that the sealing material has a melt viscosity at 120°C in a certain range. The method of sealing-material foaming application is characterized by thermally melting the sealing material, incorporating nitrogen gas into the molten sealing material at a given elevated pressure, ejecting the mixture in the air at a given pressure and applying it to an area needing sealing while foaming the mixture to thereby form a sealing foam, and curing the foam with ultraviolet.</p> |
