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AssigneeNitto Denko Corporation
InventorsKatsuhiko Tachibana, Masahiko Ando, Yasuyuki Tokunaga, Manabu Matsunaga, Atsushi Kuriu
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In accordance with the present invention, a foamed structure having closed cells or both closed cells and open cells can be effectively used as a waterstop sealing material. In particular, a waterstop sealing material having excellent sealing properties can be provided. The waterstop sealing material comprises a foamed structure having closed cells or both closed cells and open cells, the foamed structure having a multi-layer pressure-sensitive adhesive layer provided on at least one side thereof, optionally through a base material, the multi-layer pressure-sensitive adhesive layer comprising as an outermost layer a layer made of a pressure-sensitive adhesive composition containing a polymer having a polycarbonate structure having a repeating unit represented by formula: wherein R represents a C2-20 straight-chain or branched hydrocarbon group and n represents a positive integer.
A water stop sealing material comprising a foamed structure having closed cells or both closed cells and open cells, said foamed structure having two opposing surfaces, and a multi-layer pressure-sensitive adhesive layer provided on the first of said opposing surfaces, said multi-layer pressure-sensitive adhesive layer comprising an inner subbing pressure-sensitive layer comprising rubber or acrylic pressure-sensitive adhesive and an outermost layer comprising a pressure-sensitive adhesive composition containing a polymer having a polycarbonate structure having a repeating unit represented by the following general formula:
Dependencies are inferred from the claim text.