Fluoropolymer

Details Fluoropolymer Fluoropolymer

C - Chemistry, Metallurgy

08

F

C08F 220/38 (2006.01) C08F 218/10 (2006.01) C08F 218/12 (2006.01) C08F 220/24 (2006.01) C14C 9/00 (2006.01)

Patent

CA 2700142

Various fluoropolymers have been proposed for imparting oil and water repellency to leather. Commonly, these fluoropolymers are amphiphilic; i.e., they are made from at least one monomer which is hydrophobic and at least one monomer which is hydrophilic. The present invention identifies and remedies disadvantages associated with the ability of amphiphilic fluoropolymers to impart oil and water repellency to leather. Contrary to conventional thinking, it has now been discovered that the incorporation of hydrophilic groups in a fluoropolymer undesirably reduces its ability to impart water resistance to leather. Correspondingly, it has also been discovered that a fluoropolymer incorporating fewer or no hydrophilic groups imparts superior oil and water repellency to leather when compared to fluoropolymers incorporating more hydrophilic groups. Therefore, this invention provides fluoropolymers which incorporate reduced levels of hydrophilic groups.

L'invention concerne divers fluoropolymères conférant un caractère oléofuge et hydrofuge au cuir. De manière générale, ces fluoropolymères sont amphiphiles, c'est-à-dire qu'ils sont faits d'au moins un monomère hydrophobe et d'au moins un monomère hydrophile. La présente invention identifie et corrige les inconvénients associés à la capacité des fluoropolymères amphiphiles à conférer un caractère oléofuge et hydrofuge au cuir. À l'encontre de l'opinion traditionnelle, il a été découvert que l'incorporation de groupes hydrophiles dans un fluoropolymère réduit de manière indésirable sa capacité à conférer au cuir un caractère hydrofuge. Parallèlement, il a également été découvert qu'un fluoropolymère contenant moins ou pas de groupes hydrophiles confère au cuir un caractère oléofuge et hydrofuge supérieur à celui conféré par des fluoropolymères incorporant un plus grand nombre de groupes hydrophiles. Par conséquent, la présente invention fournit des fluoropolymères comprenant des niveaux réduits de groupes hydrophiles.

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