Anaerobically curable compositions containing alpha-methylene-lactones
The present invention relates to anaerobically curable compositions made from renewable materials. In particular, an alpha-methylene-lactone is used with a (meth)acrylate component and a cure system to form an anaerobically curable composition.
1 . An anaerobically curable composition comprising:
polyethylene glycol dimethacrylate;
α-methylene-γ-valerolactone; and
an anaerobic cure system comprising saccharin, 1,4-napthoquinone, and N,N-diethyl-p-toluidine,
wherein:
the polyethylene glycol dimethacrylate is present in an amount of from 20 to 50 percent by weight, based on the total weight of the anaerobically curable composition,
the α-methylene-γ-valerolactone is present in an amount of from 5 to 50 percent by weight, based on the total weight of the anaerobically curable composition, and
the anaerobic cure system is present in an amount of from 0.2 to 2 percent by weight, based on the total weight of the anaerobically curable composition.
2 . The composition of claim 1 , wherein the α-methylene-γ-valerolactone is present in an amount of about 30 percent by weight, based on the total weight of the anaerobically curable composition.
3 . The composition of claim 1 , wherein the composition further comprises ethylene-diamine tetra acetic acid, present in an amount of from about 0.001 to about 0.1 percent by weight, based on the total weight of the anaerobically curable composition.