PHOTOCURABLE COMPOSITIONS
Photocurable compositions are provided herein, which provide a balance of fast curing properties at exposure to radiation in the electromagnetic spectrum and impressive cure through depth.
1 . A photocurable composition comprising:
(a) a (meth)acrylate component;
(b) a (meth)acrylate-functionalized resin component; and
(c) an initiator component comprising a combination of a photosensitizer and a co-initiator.
2 . The composition of claim 1 , wherein the initiator component excludes an amine synergist.
3 . The composition of claim 1 , wherein the photosensitizer comprises a 1-chloro-4-propoxythioxanthone, 2,4-diethylthioxanthone, isopropylthioxanthones, and combinations thereof.
4 . The composition of claim 1 , wherein the co-initiator comprises one or more peroxides.
5 . The composition of claim 1 , wherein the co-initiator comprises one or more of benzoyl peroxide and dicumyl peroxide.
6 . The composition of claim 1 , wherein the (meth)acrylate component comprises isobornyl (meth)acrylate and N,N-dimethylacrylamide.
7 . The composition of claim 1 , wherein the (meth)acrylate component is present in the range of about 25 percent by weight to about 80 percent by weight based on the total weight of the composition.
8 . The composition of claim 1 , wherein the (meth)acrylate-functionalized resin component comprises one or more of (meth)acrylate-functionalized urethanes, (meth)acrylate-functionalized polyesters, and poly(isobutylene) di(meth)acrylates.
9 . The composition of claim 1 , wherein the (meth)acrylate-functionalized resin component resin has a number average molecular weight of from about 500 to about 100,000.
10 . The composition of claim 1 , wherein the (meth)acrylate-functionalized resin component is present in an amount from about 15 percent by weight to about 50 percent by weight based on the total weight of the composition.
11 . The composition of claim 1 , wherein the (meth)acrylate-functionalized resin component is present in an amount from about 25 percent by weight to about 35 percent by weight based on the total weight of the composition.
12 . The composition of claim 6 , wherein the isobornyl (meth)acrylate of the (meth)acrylate component is present in an amount from about 5 percent by weight to about 50 percent by weight based on the total weight of the composition.
13 . The composition of claim 6 , wherein the isobornyl (meth)acrylate of the (meth)acrylate component is present in an amount from about 15 to about 40 percent by weight based on the total weight of the composition.
14 . The composition of claim 6 , wherein the N,N-dimethylacrylamide is present in an amount from about 20 percent by weight to about 30 percent by weight based on the total weight of the composition.
15 . The composition of claim 1 , wherein the initiator component comprises an isopropylthioxanthone as a photosensitizer, and one or more of benzoyl peroxide and dicumyl peroxide as a co-initiator.
16 . The composition of claim 1 , wherein the initiator component is present in an amount from about 0.01 percent by weight to about 5 percent by weight based on the total weight of the composition.
17 . The composition of claim 1 , wherein the photosensitizer of the initiator component is present in an amount from about 0.5 percent by weight to about 5 percent by weight based on the total weight of the composition.
18 . The composition of claim 1 , wherein the co-initiator of the initiator component is present in an amount from about 0.01 percent by weight to about 3 percent by weight based on the total weight of the composition.
19 . The composition of claim 1 , wherein the photosensitizer and the co-initiator of the initiator component are present in a by weight ratio of about 1:1 to about 500:1.
20 . The composition of claim 1 , further comprising a colorant.
21 . The composition of claim 1 , comprising
(a) isobornyl (meth)acrylate in an amount of about 15 percent by weight to about 40 percent by weight based on the total weight of the composition;
(b) N,N-dimethylacrylamide in an amount of from about 20 percent by weight to about 30 percent by weight based on the total weight of the composition;
(c) (meth)acrylate-functionalized resin in an amount of from about 25 percent by weight to about 35 percent by weight based on the total weight of the composition; and
(d) as an initiator component, a combination of an isopropylthioxanthone, and one or more of benzoyl peroxide and/or dicumyl peroxide.
22 . The composition of claim 1 , wherein the (meth)acrylate-functionalized resin component is cyclohexanol, 4,4-(1-methylethylidene)bis-, polymer with 1,3-disocyanatomethylbenzene and tetrahydrofuran, propylene glycol monomer.
23 . The composition of claim 1 , when exposed to a source of radiation at 405 nm at an intensity of 100 mW/cm 2 for a period of time of at least about 2 seconds to cure the composition, the cured composition exhibits a depth of cure through a volume of the composition.
24 . A method of curing a photocurable composition according to claim 1 comprising the steps of:
(a) applying a volume of the composition to at least a first substrate; and
(b) exposing the composition to a source of radiation at 405 nm at an intensity of 100 mW/cm 2 to cure the composition through a volume of the composition.
25 . The method according to claim 24 , comprising bonding the first substrate to a second substrate, wherein the first substrate and the second substrate are each parts of medical devices and optionally thereafter sterilizing the bonded assembly created by bonding the first substrate to the second substrate.