FLEXIBLE PHOTOCURABLE CYANOACRYLATE COMPOSITIONS
The present invention relates to a photocurable composition which includes a cyanoacrylate component, a metallocene component, a photoinitiator and a plasticizer component, reaction products of which show among other things improved flexibility in terms of elongation at break.
1 . A cyanoacrylate composition, comprising:
(a) a cyanoacrylate component;
(b) a metallocene component;
(c) a photoinitiator component; and
(d) a plasticizer component.
2 . The composition according to claim 1 , wherein the plasticizer component is a short chain alkylene compound having a plurality of alkyl esters and/or reverse alkyl esters substituents thereon.
3 . The composition according to claim 1 , wherein the plasticizer component is a short chain alkylene compound having 3 or 4 carbon atoms in the chain.
4 . The composition according to claim 1 , wherein the plasticizer component is a short chain alkylene compound having a straight chain.
5 . The composition according to claim 1 , wherein the plasticizer component is a short chain alkylene compound having 2-4 substituents thereon.
6 . The composition according to claim 1 , wherein the plasticizer component is a short chain alkylene compound having a plurality of alkyl esters and/or reverse alkyl esters substituents thereon, wherein the alkyl ester and/or reverse alkyl ester has a C 1-3 alkyl ester and/or reverse alkyl ester.
7 . The composition according to claim 1 , wherein the plasticizer component is selected from:
8 . The composition according to claim 1 , wherein plasticizer component is present in an amount of from about 10 weight percent to about 30 weight percent.
9 . The composition according to claim 1 , wherein plasticizer component is present in an amount of from about 15 weight percent to about 35 weight percent.
10 . The composition according to claim 1 , wherein plasticizer component is present in an amount of about 15 weight percent to about 20 weight percent.
11 . The composition according to claim 1 , further comprising a stabilizer.
12 . The composition according to claim 1 , further comprising a stabilizing amount of an acidic stabilizer and a free radical inhibitor.
13 . The composition according to claim 1 , further comprising an accelerator component.
14 . The composition according to claim 13 , 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.
15 . 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.
16 . Reaction products of the composition according to claim 1 .
17 . The composition according to claim 1 , wherein reaction products thereof show substantially no phase separation.
18 . The composition according to claim 1 , wherein reaction products thereof show an elongation at break of greater than about 35%.
19 . The composition according to claim 1 , wherein reaction products thereof show an elongation at break of greater than about 125%.
20 . The composition according to claim 1 , wherein reaction products thereof show block shear strength on polycarbonate of greater than about 1800 psi.
21 . The composition according to claim 1 , wherein reaction products thereof show block shear strength on polycarbonate of greater than about 1900 psi.
22 . The composition according to claim 1 , wherein reaction products thereof show block shear strength on polycarbonate of greater than about 2200 psi.
23 . The composition according to claim 1 , wherein reaction products thereof show greater than about 60 cycles in the swing test.
24 . A method of bonding together two substrates, at least one of which being constructed from a thermoplastic material, comprising the steps of:
applying a cyanoacrylate 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.