Abstract:
The invention relates to a process to produce a stable fluoropolymer latex using non-fluorinated surfactant with greater thermal stability. The polymerization is run at pressures greater than typically used. The resulting polymer exhibit improved melt color stability as compared to those produced under similar conditions at lower pressures.
Abstract:
Provided is a method of making a polymeric composition comprising (a) providing a dispersion of initial polyolefin particles in an aqueous medium, wherein the initial polyolefin particles comprise (i) one or more hydrocarbon polyolefin, (ii) one or more non-hydrocarbon polyolefin, and (iii) one or more crosslinking agent; (b) contacting the initial polyolefin particles with a peroxide initiator to form crosslinked polyolefin particles.
Abstract:
The invention relates to the technical field of the inverse emulsion polymerization, in particular to a surfactant composition used in the inverse emulsion polymerization, and to the inverse emulsion polymerization process using the composition as well as polymers prepared therefrom. The surfactant composition comprises at least one polymeric surfactant based on polyalkylene oxide and long chain fatty acids and at least one surfactant based on polyoxyethylene sorbitan fatty acid ester.
Abstract:
Latex emulsions are disclosed which can be used in the formation of coating compositions that are not water sensitive, have good blush resistance and retortability. In some embodiments, the coating compositions are used to coat substrates such as cans and packaging materials for the storage of food and beverages. Coating compositions of the invention may be prepared by polymerizing at least one ethylenically unsaturated monomer component, a stabilizer comprising a strong acid and an initiator in a carrier to form an emulsion, polymerizing the emulsion with at least one different ethylenically unsaturated monomer component to prepare the composite latex emulsion, and reacting the composite latex emulsion with a neutralizer to form the coating composition. Methods of coating substrates with the coating compositions, and substrates coated with the coating compositions are also disclosed.
Abstract:
The invention pertains to a process for manufacturing a (per)fluoropolymer, said process comprising polymerizing one or more fluorinated monomers in the presence of a multi-phase medium, said medium comprising: (A) a water phase [phase (W)]; (B) at least one fluorinated surfactant [surfactant (FS)] having formula (I) here below: R f -(OCF 2 CF 2 ) K-1 -O-CF 2 -COOX a (I) wherein R f is a C 1 -C 3 perfluoroalkyl group comprising, optionally, one or more ether oxygen atoms, k is 2 or 3 and X a is a selected from a monovalent metal and an ammonium group of formula NRN4, wherein R N , equal or different at each occurrence, is a hydrogen atom or a C 1 -C 3 alkyl group; (C) an oil phase [phase (O)] comprising: - at least one non-functional (per)fluoropolyether (non-functional PFPE) comprising at least one (per)fluoropolyoxyalkylene chain [chain (Rp)] and - at least one functional (per)fluoropolyether (functional PFPE) comprising at least one (per)fluoropolyoxyalkylene chain [chain (R' F )] and having a number average molecular weight of at least 1000 and a solubility of less than 1% by weight in water at 25°C.
Abstract:
A method of separating an anionic fluorochemical surfactant from an aqueous solution containing the anionic fluorochemical surfactant, which comprises (i) bringing the aqueous solution into contact with a basic anion-exchange resin to adsorb the anionic fluorochemical surfactant onto the basic anion-exchange resin and (ii) subsequently eluting the anionic fluorochemical surfactant from the basic anion-exchange resin with an eluent which is an alkali solution comprising water and an organic solvent.