The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 2026
Filed:
Feb. 04, 2021
Kuraray Co., Ltd., Kurashiki, JP;
Kazumasa Kusudo, Okayama, JP;
Hiroyuki Kawai, Saijo, JP;
Takashi Katayama, Tokyo, JP;
Shuhei Yorimitsu, Okayama, JP;
Noriko Kawashima, Tokyo, JP;
Daisuke Konishi, Kamisu, JP;
Naoyuki Yaguchi, Kokubunji, JP;
Kenichi Kojima, Kokubunji, JP;
KURARAY CO., LTD., Kurashiki, JP;
Abstract
To provide a waterproof sheet for civil engineering, having sufficient strength and elongation even at a low temperature of about −10° C. and having excellent adhesiveness to a structure such as a tunnel. Disclosed is a waterproof sheet for civil engineering, which has a layer (A) including a composition containing an ethylene-vinyl acetate copolymer (a1) and a thermoplastic resin (a2) other than the ethylene-vinyl acetate copolymer (a1), and a silica-containing layer containing silica, wherein the content of the ethylene-vinyl acetate copolymer (a1) in the composition is 30 to 95% by mass, the content of the thermoplastic resin (a2) is 5 to 70% by mass, and the absolute value of the difference between the SP value of the ethylene-vinyl acetate copolymer (a1) and the SP value of the thermoplastic resin (a2) is less than 0.70 (cal/cm).