Peroxy cured (meth)acrylic ester compositions employing nitrite, borate, silicate or carbonate salt accelerators

Abstract

(Meth)acrylic ester formulations employing peroxy initiators have accelerated cure rates when the substrates to which they are applied, or the compositions themselves, include nitrite, borate, silicate or carbonate salts. The compositions should be free of acids having a PKa of 6 or less unless the composition also includes a transition metal compound.

What is claimed is: .[.1. A substantially 100% solids curable formulation comprising: 
     
        least 1 and R 2  is H or a x-valent hydrocarbon group..]. 2. A formulation as in claim .[.1.]. .Iadd.12, 14 or 15 .Iaddend.wherein the 
     
     
        (meth)acrylic ester comprises at least two (meth)acrylic groups. 3. A formulation as in claim g .[.1.]. .Iadd.12 or 14 .Iaddend.wherein the 
     
     
        transition metal salt is a salt of copper, iron or mixtures thereof. 4. A formulation as in claim .[.1.]. .Iadd.12, 14 or 15 .Iaddend.adapted to be 
     
     
        anaerobically curable. 5. A formulation as in claim .[.1.]. .Iadd.12, 14, or 15 .Iaddend.wherein the peroxy compound is a hydroperoxide or perester. 
     
     
        . A formulation as in claim .[.4.]. .Iadd.14 .Iaddend.wherein the 
     
     
        formulation is adapted for impregnation into a porous substrate. 7. A formulation as in claim .[.1.]. .Iadd.12 or 15 .Iaddend.wherein the 
     
     
        ingredient (c) is a nitrite salt. 8. A formulation as in claim 7 wherein 
     
     
        the nitrite salt is a nitrite salt of an alkali metal. 9. A formulation as in claim .[.1.]. .Iadd.12, 14 or 15 .Iaddend.wherein the ingredient (c) is 
     
     
        present in an amount between 0.001% and 5.0%. 10. A formulation as in claim .[.1.]. .Iadd.12, 14 or 15 .Iaddend.further comprising between about 
     
     
        0.1% and 5% of a sulfimide accelerator. 11. A formulation as in claim .[.1.]. .Iadd.14 .Iaddend.which is substantially free of an acid having a 
     
     
        pKa of 6 or less. .Iadd.12.  A substantially 100% solids curable formulation comprising: (a) at least one (meth)acrylic ester;   (b) a polymerization initiating effective amount of a peroxy compound; and   (c) an effective amount for accelerating polymerization of a nitrite, borate, silicate or alkaline carbonate salt, provided that the composition includes an acid having a pKa of 6 or less, and the composition further includes at least 1 ppm of a transition metal salt and is free of compounds of the formula: ##STR8## where R 1  is a monovalent hydrocarbon group, x is an integer of at least 1 and R 2  is H or a x-valent hydrocarbon group. .Iaddend.     
     
     
        .Iadd. 3.  A formulation as in claim 12 wherein said acid is acrylic acid. 
     
     
        .Iaddend. .Iadd.14.  A substantially 100% solids curable formulation comprising: (a) at least one (meth)acrylic ester;   (b) a polymerization initiating effective amount of a peroxy compound; and   (c) an effective amount for accelerating polymerization of a borate, silicate or alkaline carbonate salt, provided that if the composition includes an acid having a pKa of 6 or less, the composition further includes at least 1 ppm of a transition metal salt and is free of compounds of the formula: ##STR9## where R 1  is a monovalent hydrocarbon group, x is an integer of at least 1 and R 2  is H or a x-valent hydrocarbon group. .Iaddend.     
     
     
        .Iadd. 5.  A substantially 100% solids curable formulation comprising: (a) at least one (meth)acrylic ester;   (b) a polymerization initiating effective amount of a peroxy compound; and   (c) an effective amount for accelerating polymerization of a nitrite, borate, silicate or alkaline carbonate salt,   provided that the composition is substantially free of an acid having a pKa of 6 or less, and further comprises a co-accelerator compound of the formula: ##STR10## where R 1  is a monovalent hydrocarbon group, x is an integer of at least 1 and R 2  is H or a x-valent hydrocarbon group. .Iaddend.