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(b) ethylenic alpha , beta -unsaturated carboxylic acids having carboxyl group(s), such as (meth)acrylic acid, crotonic acid, itaconic acid, itaconic anhydride, maleic acid, maleic anhydride, fumaric acid, and citraconic acid, and salts of these acids;
(b) ácidos carboxílicos a,b-insaturados etilénicos que tienen grupo(s) carboxílico(s), tales como ácido (met)acrílico, ácido crotónico, ácido itacónico, anhídrido itacónico, ácido maleico, anhídrido maleico, ácido fumárico, y ácido citracónico, y sales de dichos ácidos;