Fluoroelastomer composition
AssigneeSolvay Specialty Polymers Italy S.P.A.
InventorsStefano Bossolo, Marco Avataneo, Stefano Millefanti, Michael J. Cox
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Abstract
The invention pertains to a composition based on a fluoroelastomer comprising nitrile or carboxylate-type cure sites and including a curing agent and a Br-containing marker having reactivity towards the said cure-sites, which can be cured so as to deliver cured parts maintaining chemically bound bromine atoms; this material, when submitted to wear/damage would hence release Br-containing contaminants, which can easily spotted via notably an on-line mass spectrometer, so as to monitor and anticipate critical failures of sealing materials based there upon.
Claims18
A fluoroelastomer composition (C), said composition (C) comprising:
- at least one fluoroelastomer (A), wherein fluoroelastomer (A) comprises from 0.1 to 10.0% moles, with respect to total moles of recurring units of fluoroelastomer (A), of recurring units derived from a cure-site containing monomers having at least a carbo-group [monomer (CS-C)] selected from the group consisting of carboxylic groups —COOH;
- carboxylate groups —COOXa, with Xa being a monovalent metal or an ammonium group;
- carboxamide group —CONH2;
- and alkoxycarboxylic group —COO—RH, with RH being a (fluoro)(hydro)carbon group;
- at least one curing agent [agent (A)];
- at least one bromine-containing marker [marker (B)], selected from the group consisting of compounds comprising at least one Br atom and at least one group selected from:
- (B-1) aromatic ortho-diamine groups;
- (B-2) aromatic ortho amino-(thio)phenolic groups;
- (B-3) amidoxime/amidine/amidrazone groups of formula:
- wherein RN1 is —OH or —H, and RN2 is H or NH2;
- (B-4) imidoylamidine groups of formula:
- (B-5) azide groups of formula:
- —(SO2)xn—N3, whereas xn is 0 or 1;
- and
- (B-6) carbazide groups of formula -JN-C(O)—NH—NH2, wherein JN is either a bond, an ester oxygen —O— group, or an amine —NH— group.
Dependencies are inferred from the claim text.