Anaerobically curable compositions
An anaerobically curable composition comprising a hydroxy-functionalized mono(meth)acrylate compound, an aromatic mono(meth)acrylate compound which is not the same as the hydroxy-functionalized mono(meth)acrylate compound, a (meth)acrylate functionalised polyurethane resin, and an anaerobic cure inducing component.
1. An anaerobically curable composition comprising:
(i) a hydroxy-functionalized mono(meth)acrylate compound in an amount of about 5-30 wt %, based on the total weight of the composition,
(ii) an aromatic mono(meth)acrylate compound which is not the same compound as the hydroxy-functionalized mono(meth)acrylate compound and comprises benzyl methacrylate, tetrahydrofurfuryl methacrylate or combinations thereof, in an amount of about 25-40 wt %, based on the total weight of the composition,
(iii) a (meth)acrylate functionalised polyurethane resin in an amount of about 25-40 wt %, based on the total weight of the composition, and
(iv) an anaerobic cure inducing component comprising a peroxide.
2. The composition of claim 1 wherein the hydroxy-functionalized mono(meth)acrylate compound comprises hydroxyethyl methacrylate.
3. The composition of claim 1 wherein the hydroxy-functionalized mono(meth)acrylate compound is present in an amount from about 7% to about 15% by weight based on the total weight of the composition.
4. The composition of claim 1 wherein the hydroxy-functionalized mono(meth)acrylate compound has a molecular weight below about 1000 g/mol, or below about 800 g/mol, or below about 600 g/mol, or below about 400 g/mol, or below about 200 g/mol.
5. The composition of claim 1 wherein the hydroxy-functionalized mono(meth)acrylate compound has a molecular weight of from about 100 g/mol to about 150 g/mol.
6. The composition of claim 1 wherein the aromatic mono(meth)acrylate compound has a molecular weight below about 1000 g/mol, or below about 800 g/mol, or below about 600 g/mol, or below about 400 g/mol, or below about 200 g/mol.
7. The composition claim 1 wherein the aromatic mono(meth)acrylate compound has a molecular weight of from about 150 g/mol to about 200 g/mol.
8. An anaerobically curable composition comprising:
(i) a hydroxy-functionalized mono(meth)acrylate compound in an amount of about 5-30 wt %, based on the total weight of the composition,
(ii) an aromatic mono(meth)acrylate compound which is not the same compound as the hydroxy-functionalized mono(meth)acrylate compound, in an amount of about 25-40 wt %, based on the total weight of the composition,
(iii) a (meth)acrylate functionalised polyurethane resin in an amount of about 25-40 wt %, based on the total weight of the composition, wherein the (meth)acrylate functionalised polyurethane resin has a molecular weight of from about 5000 to about 7000 g/mol, or a molecular weight from about 5500 to about 6000 g/mol, and
(iv) an anaerobic cure inducing component comprising a peroxide.
9. The composition of claim 1 wherein the composition further comprises a polyethylene filler.
10. The composition of claim 9 wherein the polyethylene filler is present in an amount from about 5% to about 15% by weight based on the total weight of the composition.
11. The composition of claim 1 wherein the composition further comprises a hydrophobic silica.
12. The composition of claim 1 wherein the composition is thixotropic.
13. The composition of claim 1 wherein the composition has a viscosity of about 500 mPa·s to about 3000 mPa·s as measured at 25° C. using BS EN 125092:2001.
14. A cure product formed by anaerobic cure of a composition according to claim 1 .
15. A method of sealing a joint between a male and a female mating parts comprising:
(i) providing a composition according to claim 1 ;
(ii) applying the composition to at least one mating part;
(iii) joining the mating parts so as to form a joint between the male and female mating parts;
(iv) and curing the composition so that the joint between the male and female mating parts is sealed by the cured composition;
optionally wherein one of the male or female mating parts is formed from a metal and the other is formed from a plastics material.
16. A sealed joint assembly comprising a male mating part and a female mating part mated together and forming a joint and the cure product of a composition according to claim 1 forming a seal for the joint.
17. The composition of claim 1 , wherein the (meth)acrylate functionalized polyurethane resin is present in an amount of about 25-36 wt %, based on the total weight of the composition.