Method for waterproofing with a cross-linked macromolecular waterproofing agent
AssigneeNippon Shokubai Kagaku Kogyko Co., Ltd.
InventorsHiroya Kobayashi, Tadao Shimomura, Kazuhiro Okamura, Yoshinori Sano
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Abstract
A waterproofing agent for an optical or electric cable, formed of a cross-linked macromolecular compound containing a sulfonic acid group or a salt thereof in an amount of not less than 0.5 mg. equivalent/g and a dissociating group in an amount of not less than 1.0 mg. equivalent/g, and a method for waterproofing said cable by packing said waterproofing agent in the sheath of said cables.
Claims11
A method for waterproofing an optical or electric cable, which comprises packing in the sheath of said cable a cross-linked macromolecular compound containing a sulfonic acid group or a salt thereof in an amount of not less than 0.5 mg. equivalent/g. and a dissociating group in an amount of not less than 1.0 mg. equivalent/g. and having the ability to absorb deionized water in the range of 50 to 1000 times its own weight, said cross-linked macromolecular compound being produced by polymerizing a monomer mixture consisting essentially of (A) 5 to 100 mol% of at least one sulfonic acid group unsaturated monomer selected from the group consisting of sulfoethyl(meth)acrylate, sulfopropyl(meth)acrylate, and 2-acrylamide-2-methyl propanesulfonic acid or salt thereof and (B) 95 to 0 mol% of at least one other unsaturated monomer selected from the group consisting of methacrylic acid, sodium methacrylate, acrylamide, acrylic acid, calcium acrylate, methacrylamide, methoxypolyethylene glycol monomethacrylate and sodium acrylate in the presence of a cross-linking agent in the range of 0.00001 to about 0.3 in molar ratio, based on said monomer mixture.
A method waterproofing an optical or electric cable, which comprises immobilizing a cross-linked macromolecular compound containing a sulfonic acid group or a salt thereof in an amount of not less than 0.5 mg. equivalent/g. and a dissociating group in an amount of not less than 1.0 mg. equivalent/g. and having the ability to absorb deionized water in the range of 50 to 1000 times its own weight, said cross-linked macromolecular compound being produced by polymerizing a monomer mixture consisting essentially of (A) 5 to 100 mol% of at least one sulfonic acid group unsaturated monomer selected from the group consisting of sulfoethyl(meth)acrylate, sulfopropyl(meth)acrylate, and 2-acrylamide-2-methyl propanesulfonic acid or salt thereof and (B) 95 to 0 mol% of at least one other unsaturated monomer selected from the group consisting of methacrylic acid, sodium methacrylate, acrylamide, acrylic acid, calcium acrylate, methacrylamide, methoxy-polyethylene glycol monomethacrylate and sodium acrylate in the presence of a cross-linking agent in the range of 0.00001 to about 0.3 in molar ratio, based on said monomer mixture, on the surface of a film or sheet with an organic polymer type binder;
- and
- backing the immobilized compound in the sheath of said cable.
A method for waterproofing an optical or electric cable, which comprises:
- immobilizing on a fibrous substance a cross-linked macromolecular compound containing a sulfonic acid group or a salt thereof in an amount of not less than 0.5 mg. equivalent/g. and a dissociating group in an amount of not less than 1.0 gm. equivalent/g. and having the ability to absorb deionized water in the range of 50 to 1000 times its own weight, and
- packing the resultant immobilized compound in the sheath of said cable.
Dependencies are inferred from the claim text.