摘要:
A process for protecting marble, stones, tiles, cement and similar materials from the action of atmospheric and polluting agents, by applying a perfluropolyether to the surface of the manufactured article, characterized by using a perfluoropolyether having at one or at both ends functional groups capable of acting as anchoring agents for the substrate.
摘要:
A process for protecting manufactured structures or articles of marble, stones, tiles, cement and the like from the action of polluting and atmospheric agents, by applying a perfluoropolyether onto the surface of the manufactured structure or article, characterized in that there is utilized a perfluoropolyether having at one or both its ends functional groups selected from carboxylic, ester or amidic groups.
摘要:
This invention relates to the preparation of new fluorinated polymers starting from acrylic esters and/or acrylamides, in which the cross-linking degree of the final product is controlled by using, as a starting product, a mixture of mono- and di-acryl monomers, said monomers being characterized in that they include in their structure a perfluoropolyoxyalkylene chain.
摘要:
Elastomeric compositions vulcanizable with peroxides, consisting of a fluoroelastomer based on vinylidene fluoride and containing small quantities of brominated or iodinated olefine as comonomer, admixed with from 1% to 25% by weight of perfluoropolyether or polycondensation derivatives thereof such as perfluoropolyamides.
摘要:
A lubricating grease consisting of a mixture containing from 15% to 40% by weight of polytetrafluoroethylene, from 60% to 85% by weight of a liquid dispersing medium of the type of perfluoropolyether or oligomer of C.sub.2 ClF.sub.3, less than 1% by weight of a perfluoroalkyl or polyoxyperfluoroalkyl surfactant and, optionally, stabilizing and anticorrosive agents of the class of polyoxyperfluoroderivatives, said mixture being subjected to grinding in order to obtain the disaggregation of the polytetrafluoroethylene granules into primary particles not larger than 1 micron.
摘要:
Vulcanizable mixes based on elastomeric copolymers of vinylidene fluoride with fluorinated or chlorofluorinated olefins, or with fluorinated vinyl ethers, and which comprise, as processing aid, at least one fluorinated polyamide, are disclosed.
摘要:
Disclosed are alkali and ammonium polyoxapolyfluoroalkanesulphonates having the formula:A-[CF.sub.2 O--(C.sub.2 F.sub.4 O).sub.m (CF.sub.2 O).sub.n --CF.sub.2 ]-Band the free acids thereof, in which the oxyperfluoroalkylene units --C.sub.2 F.sub.4 O--and --CF.sub.2 O-- are randomly distributed along the chain; m and n are integers the sum of which is a number from 2 to 50, and preferably from 4 to 20; the m/n ratio is between 0.2 and 1.5; A is a monovalent radical --CH.sub.2 O--R--SO.sub.3 M, wherein R is a divalent radical in alpha-gamma or alpha-delta position and is selected from the group consisting of alkylene, cycloalkylene, arylene and benzylene radicals, optionally containing, as substituents, chlorine atoms or alkylene or alkoxy groups; and M is an alkali metal, hydrogen or an ammonium group; and B is the same as A or is the radical --CH.sub.2 OH. These products are prepared by reacting .alpha.,.omega.-bis(hydroxymethyl)polyoxaperfluoroalkanes having the formulaHO-CH.sub.2 -[CF.sub.2 O-(C.sub.2 F.sub.4 O).sub.m (CF.sub.2 O).sub.n -CF.sub.2 ]-CH.sub.2 OH,or the alkali or ammonium dialcoholates thereof, with a sultone of the formula ##STR1## wherein R is a divalent radical in alpha-gamma or alpha-delta position and is selected from the group consisting of alkylene, cycloalkylene, arylene and benzylene radicals.