Aqueous, concentrated polycarboxylic acid sodium salt solutions, their production and use
AssigneeClariant Finance (BVI) Limited
InventorsBernard Danner, Francis Palacin
Life of this patent
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Abstract
Aqueous, homogeneous 20 to 60% solutions (L) of mixtures of (A) copolymers of (x) (meth)acrylic acid with (y) maleic acid or maleic acid anhydride in the molar ratio (x)/(y)=0.7/1 to 7/1, with an average molecular weight M.sub.w in the range of from 500 to 500'000, as free acids and/or sodium salts and (B) Nitrilotriacetic acid as free acid and/or sodium salt, in which the weight ratio (A)/(B) is in the range of from 1/1 to 1/10 at least 25% of the total carboxy groups are present as sodium salt and the pH of (L) is in the range of from 5 to 11, are suitable as adjuvants for the treatment of fibrous material, in particular as scouring agents for dyeings of hydrophilic fibrous material.
Claims17
Aqueous, homogeneous 20 to 60%, by weight, solution (L) of a mixture of
- (A) copolymers of (x) (meth)acrylic acid with (y) maleic acid or maleic acid anhydride in the molar ratio (x)/(y) =0.7/1 to 7/1, with an average molecular weight M.sub.w in the range of from 500 to 500,000, as free acids and/or sodium salts and
- (B) Nitrilotriacetic acid as free acid and/or sodium salt,
- in which the weight ratio (A)/(B) is in the range of from 1/1 to 1/10, at least 25% of the total carboxy groups, in (A) and (B), are present as sodium salt and the pH of (L) is in the range of from 5 to 11.
Dependencies are inferred from the claim text.