| 摘要 |
Aqueous dispersions comprising a mixture of: A) from 0.05% by weight to 10% by weight of salts of perfluoropolyether di-carboxylic derivatives having formula: <?in-line-formulae description="In-line Formulae" end="lead"?>T-O-R<SUB>f</SUB>-T (IA) <?in-line-formulae description="In-line Formulae" end="tail"?> wherein T=-CF<SUB>2</SUB>-COOZ or -CF<SUB>2</SUB>CF<SUB>2</SUB>-COOZ wherein Z=Na, K, NH<SUB>4</SUB>, R<SUB>1</SUB>(R<SUB>2</SUB>)(R<SUB>3</SUB>)N wherein R<SUB>1</SUB>=R<SUB>2</SUB>=alkyl or hydroxyalkyl, R<SUB>3</SUB>=H, alkyl or hydroxyalkyl, R<SUB>f </SUB>is a (per)fluoropolyoxyalkylene chain having number average molecular weight between 500 and 10,000. B) from 0.01% to 5% by weight of water-dispersible or water-soluble cationic polymers, having a charge density, defined as number of equivalents per weight unit of dry polymer, higher than 1 meq/g of dry polymer.
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