Novel aqueous adhesive
AssigneeNippon Oil Co., Ltd.
InventorsHirosuke Imai, Hiroyuki Ito
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Abstract
A water-soluble adhesive comprising a partly alkali metal-modified butadiene-maleic anhydride copolymer wherein the free carboxylic acid groups and the carboxylic acid-alkali metal salt groups are contained in ratios of from 9 : 1 to 2.5 : 7.5; and a process for preparing same.
Claims6
A water-soluble adhesive consisting essentially of an aqueous solution of a partly alkali metal modified butadienemaleic anhydride copolymer wherein the free carboxylic acid groups and the carboxylic acid-alkali metal salt groups are contained in ratios of from 9 :
- 1 to 2.5 :
- 7.5, respectively, the partly alkali metal-modified copolymer being prepared from a starting butadiene-maleic anhydridecopolymer wherein the butadiene and maleic anhydride units are on the main chain and at least one alkali metal compound.
A process for the preparation of a water-soluble adhesive comprising a partly alkali metal-modified butadiene-maleic anhydride copolymer wherein the free carboxylic acid groups and the carboxylic acid-alkali metal salt groups are contained in ratios of from 9 :
- 1 to 2.5 :
- 7.5, comprising the steps of hydrolyzing a starting butadiene-maleic anhydride copolymer having an intrinsic viscosity of 0.1-3.0 as determined in acetone at 30.degree. C and then reacting the thus-hydrolyzed copolymer with at least one alkali metal compound in such amounts as to correspond to 0.2-1.5 equivalent of the maleic anhydride residues in said starting copolymer, in a liquid phase at 20.degree. -100.degree. C for 1/2-5 hours.
Dependencies are inferred from the claim text.