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US 2021/0230327 A1Published application
Fluoroelastomer curable composition
AssigneeSolvay Specialty Polymers Italy S.P.A.
InventorsLiubov CHERNYSHEVA, Lidia Maria BAIGUERA, Mattia BASSI, Nicola RANIERI
Life of this patent
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Abstract
The invention pertains to UV-curable compositions comprising a iodine-containing (per)fluoroelastomer, and well-defined amount of certain combinations of given photoinitiators and crosslinking which are particularly effective in delivering through low temperature UV curing crosslinked parts possessing outstanding mechanical properties.
Claims18
A composition (C) comprising:
- at least one fluroelastomer (A), wherein fluoroelastomer (A) is a (per)fluoroelastomer comprising iodine cure sites;
- at least one initiator (P). wherein initiator (P) is a photoinitiator of formula:
- wherein:
- each of RAH, equal to or different from each other, is a C1-C12 hydrocarbon group, optionally containing one or more than one heteroatom, selected from the group consisting of oxygen, nitrogen, and sulfur;
- jA is zero or is an integer of 1 to 3;
- E is either a trivalent ═P(═O)— group or a trivalent ═C(RDH)— group, with RDH being a methyl group or an ethyl group;
- RBH is a phenyl, a methyl group or an ethyl group, with the provisio that when E is ═C(RCH)—, then RBH is a methyl group or an ethyl group;
- RCH is a hydrogen atom or is selected from a methyl group and an ethyl group;
- said initiator (P) being present in an amount of 4.0 to 15.0 phr, based on fluoroelastomer (A);
- and
- at least one compound (U), wherein compound (U) is a polyunsaturated compound selected from:
- (U-1) tri-substituted isocyanurate compounds of general formula:
- wherein each of Risocy, equal to or different from each other and at each occurrence, is independently selected from H or a group —Rrisocy or —ORrisocy, with Rrisocy being C1-C5 alkyl, optionally comprising halogen(s), and each of Jisocy, equal to or different from each other and at each occurrence, is independently selected from a bond or a divalent hydrocarbon group, optionally comprising heteroatoms, and
- (U-2) tri-substituted cyanurate compounds of general formula:
- wherein each of Rcy, equal to or different from each other and at each occurrence, is independently selected from H or a group —Rrcy or —ORrcy, with Rrcy being C1-C5 alkyl, optionally comprising halogen(s), and each of Jcy, equal to or different from each other and at each occurrence, is independently selected from a bond or a divalent hydrocarbon group, optionally comprising heteroatoms;
- said compound (U) being present in an amount of 2.5 to 15.0 phr, based on fluoroelastomer (A).
13 more elements
Dependencies are inferred from the claim text.