Surface treatments with bifunctional perfluoropolyether derivatives

US6221434A · kind A · utility

Assignee

• Ausimont S.p.A. · IT

Inventors

• Mario Visca · Alessandria, IT
• Silvana Modena · Monza, IT
• Simonetta Antonella Fontana · Milano, IT
• Giovanni Gavazzi · Cassano d'Adda, IT

Key dates

• Filing date: Nov 29, 1999
• Grant date: Apr 24, 2001
• Expiry date: Nov 29, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K3/18
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A surface treatment method for imparting -oil- and/or water-repellency, comprising the step of applying to the surface to be treated compositions comprising at least one compound having the formula III EQU ACF.sub.2 O--(CF.sub.2 O).sub.n (C.sub.2 F.sub.4 O).sub.m --CF.sub.2 --B III where n=1-20, m=1-20 and A and B are reactive functional groups chosen independently from the group constituted by: PA0 a) CONHR, where R=C.sub.n H.sub.2n+1 with n=1-30, PA0 b) CH.sub.2 OH, PA0 c) CONH(X)SiR.sup.1.sub.n (OR').sub.3-n, where n=0-2, R.sup.1 and R', identical or different, are C.sub.r H.sub.2r+1 alkyl radicals, where r=1-4, and X is a bifunctional alkyl spacer of the (CHR").sub.m type, where m=1-20, and R" can be H or CH.sub.3, optionally containing heteroatoms, PA0 d) --[CH.sub.2 O(R'"O).sub.p ].sub.k --P(O)(OH).sub.3-k, where R'" is an alkylene radical, for example C.sub.2 H.sub.4 or C.sub.3 H.sub.6, p=1-10 and k=1, 2, the composition comprising the compound at a suitable concentration and being applied in an amount suitable to obtain substantially at least one monolayer of the compound on the surface to be treated, the reactive groups being chosen according to the nature of the surface t…