Abstract:
A fluoropolymer coating composition is described comprising an aqueous liquid medium, fluoropolymer particles dispersed in the aqueous liquid medium, and at least one aziridine compound. The aziridine compound comprises at least two aziridine groups (i.e. polyaziridine) or at least one aziridine group and at least one alkoxy silane group. In another embodiment, an article is described comprising a substrate wherein a surface of the substrate comprises a coating comprising fluoropolymer particles; and a reaction product of at least one aziridine compound comprising at least two aziridine groups or at least one aziridine group and at least one alkoxy silane group. The coating can be utilized as a primer for bonding a non-fluorinated substrate to a fluoropolymer film and/or the coating can be used as an (e.g. outer exposed) surface layer. In some embodiments, the article may be the (e.g. backside) film of a photovoltaic module.
Abstract:
Described herein is a method of making a fluoropolymer and fluoropolymers thereof, wherein the method comprises: (a) providing an aqueous solution comprising a water soluble polyiodide salt of Formula (I): M +y [I-I-(I)J y - wherein M is a cation group having a valence y, y is an integer of at least 1 and n is an integer of at least 1; and (b) initiating polymerization of a monomer in the aqueous solution, wherein the monomer is a fluorinated monomer.
Abstract:
A process of removing fluorinated compounds from an aqueous phase originating from the preparation of fluoropolymers said process comprising the use of polycationic polymers.
Abstract:
There is provided a fluoroelastomer characterized by containing one type or more types of fluorinated emulsifiers represented by the formula: F-(CF2)t -[O(CF2)n]m-O-(CHF)o-(CF2)p-X where m = 0 to 3; n = 1 to 5; o = 0 to 1; p = 1 to 3; t = 1 to 10; and where when t = 2 than o ≠ 0; and further where X is selected from a group consisting of a carboxyl acid group and a salt of a carboxylic acid group. A method for preparing fluoroelastomers by using such fluorinated emulsifiers in emulsion polymerization of fluoromonomers and articles containing such fluoroelastomers are also provided. A fluorinated elastomer dispersion including an aqueous mixture of a crosslinkable fluorinated elastomer and such fluorinated emulsifiers are also provided. The fluoroelastomers created with such fluorinated emulsifiers are essentially free of cations other than NH4+ and H+ and have a low glass transition temperature.
Abstract translation:本发明提供一种含氟弹性体,其特征在于,含有由式:F-(CF 2)t - [O(CF 2)n] m -O-(CHF)o - (CF 2)p X表示的一种以上的含氟乳化剂,m = 0 到3; n = 1至5; o = 0到1; p = 1至3; t = 1至10; 并且当t = 2时比o≠0; 并且其中X选自由羧酸基团和羧酸基团组成的组。 还提供了通过使用这种氟化乳化剂在含氟单体和含有这种含氟弹性体的制品的乳液聚合中制备含氟弹性体的方法。 还提供了包含可交联氟化弹性体和这种氟化乳化剂的含水混合物的含氟弹性体分散体。 用这种氟化乳化剂产生的含氟弹性体基本上不含除NH4 +和H +以外的阳离子,并具有低玻璃化转变温度。
Abstract:
The present invention is a fluoropolymer comprising a plurality of pendent groups terminating in -CF 2 SO 3 X, -CF 2 SO 2 F, or combinations thereof, where X is selected from a group consisting of H + and a monovalent cation, and at least one -CF 2 Y end group, where Y is selected from a group consisting of a chlorine atom, a bromine atom, an iodine atom, a nitrile group, and an -SO 3 X group.
Abstract:
A method is provided for making a crosslinked polymer electrolyte, typically in the form of a membrane for use as a polymer electrolyte membrane in an electrolytic cell such as a fuel cell, as well as the polymer so made, the method comprising application of electron beam radiation to a highly fluorinated fluoropolymer comprising: a backbone derived in part from tetrafluoro-ethylene monomer, first pendent groups which include a group according to the formula -SO2X, where X is F, C1, Br, OH or -O-M+, where M+ is a monovalent cation, and second pendent groups which include Br, C1 or I. Typically, the membrane has a thickness of 90 microns or less, more typically 60 or less, and most typically 30 microns or less.
Abstract:
Described herein is a peroxide curable, highly fluorinated elastomer derived from tetrafluoroethylene, a perfluoro ether monomer, and a compound selected from at least one of a highly fluorinated bisolefin ether and an iodine-containing perfluorinated ether.