摘要:
Chain transfer agents that are chlorine-free and liquid under polymerization conditions, useful for fluoromonomer polymerization, have the following structure: R1—O—R2 They are superior to common chain transfer agents such as chloroform in being safer and environmentally benign. They are also superior to gaseous chain transfer agents such as ethane because they do not enter the fluoromonomer gas recycle streams and so do not complicate the analysis and purification of those streams.
摘要:
This invention concerns substantially fluorinated, but not perfluorinated, ionomers consisting of a polyethylene backbone having pendant groups of fluoroalkoxy sulfonic acids and metal salts thereof. Such ionomers are useful for electrochemical applications.
摘要:
This invention concerns polymers, having fluoroalkoxy side chains, which are made by a novel process comprising reacting a polymer containing hydroxyl groups, especially poly(vinyl alcohol), with a fluorinated olefin in the presence of a base. The resulting polymers are useful in coatings, as in optical wave guides, and antireflective coatings and in other optical devices.
摘要:
A metal exchanged fluorinated ionomer is a copolymer minimally including repeating units of (i) a polymerized derivative of a perfluorinated cyclic or cyclizable monomer and (ii) a strong acid highly fluorinated vinylether compound in which the acid moiety is exchanged with a cation of a Group 11 metal. Metal exchanged fluorinated ionomers are readily soluble and can be formed into thin, selectively gas permeable membranes by solution deposition methods. These membranes are suitable for separating olefins from gas olefin/paraffin mixtures. Good selectivity and transmembrane flux can be obtained without humidifying the membrane feed gas mixture.
摘要:
The present invention relates to compositions comprising at least one fluoroolefin and an effective amount of stabilizer that may be a terpene, terpenoid or fullerene; or a mixture of a terpene, terpenoid or fullerene with other stabilizers. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers, and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.
摘要:
The present invention relates to novel unsaturated polycyclic compounds containing two fluoroalcohol substitutents. This invention also relates to homopolymers and copolymers derived from such unsaturated polycyclic compounds. The copolymers are useful for photoimaging compositions and, in particular, photoresist compositions (positive-working and/or negative-working) for imaging in the production of semiconductor devices. The polymers are especially useful in photoresist compositions having high UV transparency (particularly at short wavelengths, e.g., 157 nm) which are useful as base resins in resists and potentially in many other applications.
摘要:
Fluorinated copolymers useful in photoresist compositions and associated processes for microlithography are described. These copolymers are comprised of a fluoroalcohol or protected fluoroalcohol functional group which simultaneously imparts high ultraviolet (UV) transparency and developability in basic media to these materials and a repeat unit derived from an acrylate monomer containing a fluoroalkyl group or a hydroxyl substituted alkyl group. The materials of this invention have high UV transparency, particularly at 193 and 157 nm, which makes them highly useful for lithography at these short wavelengths.
摘要:
Fluorinated polymers, photoresists and associated processes for microlithography are described. These polymers and photoresists are comprised of a fluoroalcohol functional group which simultaneously imparts high ultraviolet (UV) transparency and developability in basic media to these materials. The materials of this invention have high UV transparecy, particularly at short wavelengths, e.g., 157 nm, which makes them highly useful for lithography at these short wavelengths.
摘要:
Chain transfer agents that are chlorine-free and liquid under polymerization conditions, useful for fluoromonomer polymerization, have the following formula: R1—O—R2. They are superior to common chain transfer agents such as chloroform in being safer and environmentally benign. They are also superior to gaseous chain transfer agents such as ethane because they do not enter the fluoromonomer gas recycle streams and so do not complicate the analysis and purification of those streams.