Light-curable compositions useful for forming composite materials
AssigneeArkema France
InventorsKyle Snow, William Wolf
Life of this patent
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Abstract
Composite materials are formed by photo curing compositions containing one or more cyanoacrylates, substantial amounts of one or more fillers (in particular, opaque and/or fibrous fillers such as carbon fibers) as well as particular photoinitiator systems. The photoinitiator system may comprise, for example, a metallocene compound such as a ferrocene in combination with an acylgermane or other photocleavable compound which generates an acyl radical when exposed to light. Complete, deep curing of such compositions to provide composite materials having improved mechanical properties can be achieved, even though the light used to initiate curing may not be capable of penetrating the entire thickness of the composition due to the presence of the filler.
Claims28
A light-curable composition useful for forming a composite material, wherein the light-curable composition comprises:
- a) a photoinitiator system comprising at least one of i) a combination of at least one metallocene compound comprising a transition metal of Group VIII of the periodic table and aromatic electron system ligands and at least one photocleavable compound which generates an acyl radical when exposed to light or ii) a photocleavable metallocene compound comprising a transition metal of Group VIII of the periodic table and aromatic electron system ligands which generates an acyl radical when exposed to light;
- b) at least one cyanoacrylate;
- and
- c) at least 10% by weight, based on total weight of the light-curable composition, of at least one opaque filler.
A light-curable composition useful for forming a composite material, wherein the light-curable composition comprises:
- a) a photoinitiator system comprising a combination of at least one ferrocene compound of formula (I) and at least one acylgermane compound of formula (II) or formula (III):
- wherein R1 is hydrogen or C1-C4 alkyl, each R1 group is the same or different, and one or more R groups are present in one or both cyclopentadienyl groups;
- wherein R2 is methyl or phenyl;
- wherein R3 is hydrogen or methoxy;
- b) at least one cyanoacrylate;
- c) at least 20% by weight, based on total weight of the light-curable composition, of opaque carbon fibers;
- and
- d) at least one acid stabilizer compound selected from the group consisting of Lewis acids.
A composite material which is the cured reaction product of a light-curable composition comprised of:
- a) a photoinitiator system comprising at least one of i) a combination of at least one metallocene compound comprising a transition metal of Group VIII of the periodic table and aromatic electron system ligands and at least one photocleavable compound which generates an acyl radical when exposed to light or ii) a photocleavable metallocene compound comprising a transition metal of Group VIII of the periodic table and aromatic electron system ligands which generates an acyl radical when exposed to light;
- b) at least one cyanoacrylate;
- and
- c) at least 10% by weight, based on total weight of the light-curable composition, of at least one opaque filler.
Dependencies are inferred from the claim text.