EP0407937A1
Expired / Lapsed
EP
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Fluoroelastomers with improved processability and process for preparing them
Assignee: Syensqo Specialty Polymers Italy SpA
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Filing: 1990-07-09
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Granted: —
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Expires: 2010-07-09
Abstract
Abstract Described are fluoroelastomers characterized by the presence of iodine and/or bromine atoms at the end of the polymeric chain, in an amount of at the most one iodine and/or bromine atom per polymeric chain, and by a bromine content within the chain ranging from 0.05 to 2% by weight, based on the total weight of the monomeric units. Said fluoroelastomers exhibit improved processability, particularly as regards their use in injection moulding and the release from the moulds, as well as an improved heat stability. A process for preparing said fluoroelastomers is also disclosed.
Inventors
- 👤 Margherita Albano
- 👤 Giulio Brinati
- 👤 Vincenzo Arcella
- 👤 Enzo Giannetti
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:12
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/22
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
82 words
Elastomeric fluorinated copolymers comprising monomeric units derived from vinylidene fluoride and/or tetrafluoroethylene, optionally combined with monomeric units derived from hexafluoropropene and/or perfluoroalkyl-perfluorovinylethers, which contain terminal iodine and/or bromine atoms in an amount of, at the most, one iodine and/or bromine atom per polymeric chain and which contain bromine within the chain, derived from brominated units of the polymeric chain, in an amount of from 0.05 to 2% by weight, based on the total weight of the monomeric units present in the polymer.
Claim 2
Dependent Claim
82 words
Elastomeric fluorinated copolymers comprising monomeric units derived from vinylidene fluoride and/or tetrafluoroethylene, optionally combined with monomeric units derived from hexafluoropropene and/or perfluoroalkyl-perfluorovinylethers, which contain terminal iodine and/or bromine atoms in an amount of, at the most, one iodine and/or bromine atom per polymeric chain and which contain bromine within the chain, derived from brominated units of the polymeric chain, in an amount of from 0.05 to 2% by weight, based on the total weight of the monomeric units present in the polymer.
Claim 3
Dependent Claim
33 words
Copolymers according to claim 1, wherein the terminal iodine and/or bromine atoms of the polymeric chains represent from 0.001 to 1% by weight of the total weight of the monomeric units present therein.
Claim 4
Dependent Claim
36 words
Copolymers according to any one of claims 1 and 2, wherein the content of terminal iodine and/or bromine atoms is from 0.04 to 0.6% by weight of the total weight of the monomeric units present therein.
Claim 5
Dependent Claim
40 words
Copolymers according to any one of claims 1 to 3, comprising up to 40% by moles, based on the total moles of fluorinated monomeric units, of units derived from an olefin selected from ethylene, propylene, butene, isobutene or mixtures thereof.
Claim 6
Dependent Claim
77 words
Process for preparing elastomeric fluorinated copolymers containing terminal iodine and/or bromine atoms in an amount not exceeding one iodine and/or bromine atom per polymer chain, which process comprises polymerizing a monomer selected from vinylidene fluoride, tetrafluoroethylene, hexafluoropropene, perfluoroalkyl-perfluorovinylethers or mixtures thereof with at least one polymerizable brominated monomer by means of radical starters and in the presence of one or more compounds capable of providing, under the polymerization conditions, I⁻ and/or Br⁻ ions in the polymerization medium.
Claim 7
Dependent Claim
77 words
Process for preparing elastomeric fluorinated copolymers containing terminal iodine and/or bromine atoms in an amount not exceeding one iodine and/or bromine atom per polymer chain, which process comprises polymerizing a monomer selected from vinylidene fluoride, tetrafluoroethylene, hexafluoropropene, perfluoroalkyl-perfluorovinylethers or mixtures thereof with at least one polymerizable brominated monomer by means of radical starters and in the presence of one or more compounds capable of providing, under the polymerization conditions, I⁻ and/or Br⁻ ions in the polymerization medium.
Claim 8
Dependent Claim
12 words
Process according to claim 5, which is carried out in aqueous emulsion.
Claim 9
Dependent Claim
43 words
Process according to any one of claims 5 and 6, wherein said brominated monomer is employed in an amount such as to provide a polymer containing from 0.05 to 2% by weight of bromine, based on the total weight of the monomer units.
Claim 10
Dependent Claim
43 words
Process according to any one of claims 5 to 7, wherein the mixture of monomers comprises up to 40% by moles, based on the total moles of fluorinated monomers present therein, of an olefin selected from ethylene, propylene, butene-1, isobutene and mixtures thereof.
Claim 11
Dependent Claim
29 words
Process according to any one of claims 5 to 8, wherein the compounds capable of providing I⁻ or Br⁻ ions are iodides or bromides of alkali or alkaline-earth metals.
Claim 12
Dependent Claim
17 words
Process according to any one of claims 5 to 9, wherein alkali and/or alkaline-earth iodides are employed.
References Cited (Backward Citations)
EP0055407A1
Cited
EP0211251B1
Cited
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