The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 2001
Filed:
Sep. 24, 1999
Kathy E. M. L. A. Allewaert, Haacht, BE;
Frans A. Audenaert, Kaprijke, BE;
Pierre J. Vander Elst, Elewijt, BE;
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
The present invention provides a method for preparing a fluorochemical composition comprising polyurethane by reacting: (A) fluorochemical oligomer of formula (I): M,M,—Q,—T,wherein: M,M,represents flurochemical oligomer comprising m units derived from fluorinated monomer and n units derived from fluorine-free monomer and wherein the fluorinated monomers and fluorine-free monomers may be the same or different; m represents a value of 2 to 40; n represents a value of 0 to 20; T,is —OH or —NH,; Q,and T,together represent an organic residue obtained by removing a hydrogen atom from a chain transfer agent that is functionalized with T,; and (B) difunctional compound capable of reacting with an isocyanate and comprising a poly(oxyalkylene) group having 18 to 280 oxyalkylene moieties with (C) diisocyanate or triisocyanate. Substrates treated with the fluorochemical composition prepared according to the method described above, have good stain release properties in particular for oily stains and water based stains such as wine, tea and coffee.