Cyanoacrylate compositions
This invention relates to cyanoacrylate-containing compositions, which when cured provide improved bonding performance on aluminum substrates.
1 . A cyanoacrylate adhesive composition, comprising:
(a) a cyanoacrylate component, and
(b) an aromatic multifunctional anhydride component, wherein the aromatic multifunctional anhydride component is an aromatic dianhydride component
selected from the group consisting of:
2 . The composition according to claim 1 , wherein the wherein the aromatic multifunctional anhydride component is an aromatic dianhydride component within the following structure:
wherein X is as defined above.
3 . The composition according to claim 1 , wherein the cyanoacrylate component is selected from the group consisting of methyl cyanoacrylate, ethyl-2-cyanoacrylate, propyl cyanoacrylates, butyl cyanoacrylates, octyl cyanoacrylates, allyl cyanoacrylate and β-methoxyethyl cyanoacrylate.
4 . The composition according to claim 1 , further comprising a multi-functional cyanoacrylate component.
5 . The composition according to claim 4 , wherein the multi-functional cyanoacrylate component is embraced by structure I
wherein R in structure I is a linkage selected from (CH 2 ) n , with n being 2, 3, 4, 5, 6, 8, 9, 10, or 12.
6 . The composition according to claim 4 , wherein the multi-functional cyanoacrylate component is selected from the group consisting of 1,10-decanediol bis-cyanoacrylate, 1,8-octanediol bis-cyanoacrylate, and 1,6-hexanediol bis-cyanoacrylate.
7 . The composition of claim 1 , further comprising a stabilizing amount of an acidic stabilizer and a free radical inhibitor.
8 . The composition according to claim 1 , further comprising an accelerator component.
9 . The composition according to claim 8 , wherein the accelerator component is selected from the group consisting of calixarene, oxacalixarene, silacrown, cyclodextrin, crown ether, poly(ethyleneglycol) di(meth)acrylate, ethoxylated hydric compound, and combinations thereof.
10 . The composition according to claim 9 , wherein the crown ether is selected from members within the group consisting of 15-crown-5, 18-crown-6, dibenzo-18-crown-6, benzo-15-crown-5-dibenzo-24-crown-8, dibenzo-30-crown-10, tribenzo-18-crown-6, asym-dibenzo-22-crown-6, dibenzo-14-crown-4, dicyclohexyl-18-crown-6, dicyclohexyl-24-crown-8, cyclohexyl-12-crown-4, 1,2-decalyl-15-crown-5, 1,2-naphtho-15-crown-5, 3,4,5-naphtyl-16-crown-5, 1,2-methyl-benzo-18-crown-6, 1,2-methylbenzo-5, 6-methylbenzo-18-crown-6, 1,2-t-butyl-18-crown-6, 1,2-vinylbenzo-15-crown-5, 1,2-vinylbenzo-18-crown-6, 1,2-t-butyl-cyclohexyl-18-crown-6, asym-dibenzo-22-crown-6, and 1,2-benzo-1,4-benzo-5-oxygen-20-crown-7 and combinations thereof.
11 . The composition according to claim 1 , further comprising additives selected from the group consisting of tougheners, shock resistant additives, thixotropy conferring agents, thickeners, dyes, and combinations thereof.
12 . Reaction products of the composition according to claim 1 .
13 . A method of bonding together two substrates, at least one of which is constructed from aluminum, comprising the steps of:
applying a cyanoacrylate-containing composition according to claim 1 , to at least one of the substrates and
mating together the substrates for a time sufficient to permit the adhesive to fixture.
14 . A method of preparing a cyanoacrylate-containing composition according to claim 1 , comprising the steps of:
providing a cyanoacrylate component, and
combining therewith with mixing an aromatic multi-functional anhydride component.
15 . The composition according to claim 1 , wherein cured products thereof show an improvement in tensile strength performance on aluminum substrates as contrasted to compositions without the claimed anhydride of (b).