C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 9/26 (2006.01) B01D 67/00 (2006.01) B01D 71/32 (2006.01) C08G 65/00 (2006.01) C08G 65/22 (2006.01) C08J 9/28 (2006.01) C08L 71/02 (2006.01) G02B 1/04 (2006.01) G02C 7/04 (2006.01)
Patent
CA 2248045
The present invention relates to porous polymers comprising a perfluoropolyether unit, to a process for producing such porous polymers, in particular to a process for polymerising or copolymerising monomers incorporating perfluoropolyethers to form porous polymers, to articles made of or comprising porous polymers comprising a perfluoropolyether unit, such as membranes or ophthalmic devices, and to the use of porous polymers comprising perfluoropolyether units as articles, such as membranes or ophthalmic devices. The perfluoropolyether units are preferably of formula PFPE -OCH2CF2O(CF2CF2O)x(CF2O)y CF2CH2O- (PFPE) wherein the CF2CF2O and CF2O units may be randomly distributed or distributed as blocks throughout the chain and wherein x and y may be the same or different such that the molecular weight of the perfluorinated polyether is in the range of from 242 to 4,000. The porous polymer is polymerized from monomers comprising macromonomers having one or more perfluoropolyether units, and using poly(alkylene)glycols as porogens during polymerization, wherein polymerization starts from a co-continuous microemulsion and displays a discrete phase during or at the end of the polymerization, the discrete phase forming an interpenetrating network throughout the mixture, and wherein the water content of the polymer, when fully equilibrated with water, is above 5 weight percent. The process can comprise the steps of 1) dispersing a porogen in a continuous monomer component phase wherein said continuous monomer component phase comprises at least one monomer having at least one perfluoropolyether unit and wherein said porogen is an optionally substituted poly(alkylene)glycol; 2) thereafter polymerising the continuous monomer phase whereby more than 600 of the porogen is in the form of a discrete phase immediately after polymerization; and 3) removing the porogen from the porous polymer.
L'invention porte sur des polymères poreux comportant une unité de perfluoropolyéther, sur un procédé de production desdits polymères poreux, et en particulier sur un procédé de polymérisation ou de copolymérisation de monomères comprenant des perfluoropolyéthers en vue de l'obtention de polymères poreux comportant une unité de perfluoropolyéther, sur des articles faits de polymères poreux ou incluant de tels polymères, lesquels présentent une unité de perfluoropolyéther, articles tels que des membranes ou des dispositifs ophtalmiques. Les unités de perfluoropolyéther répondent de préférence à la formule (PFPE) suivante: -OCH2CF2O(CF2CF2O)x(CF2O)yCF2CH2O-, dans laquelle les unités CF2CF2O et CF2O peuvent être distribuées aléatoirement ou distribuées comme blocs à l'intérieur de la chaîne, et dans laquelle x et y peuvent être identiques ou différents mais tels que le poids moléculaire du polyéther perfluoré se situe entre 242 et 4000. Lesdits polymères poreux, qui comportent une ou plusieurs unités de perfluoropolyéther dont la teneur en eau, lorsqu'elles sont gorgées d'eau, est supérieure à celle de ces mêmes polymères polymérisés dans des conditions normales, sont adaptés à des applications telles que la production de lentilles ophtalmiques souples.
Chaouk Hassan
Meijs Gordon Francis
Commonwealth Scientific And Industrial Research Organisation
Fetherstonhaugh & Co.
Novartis Ag
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