US 5,334,675 A · Latent acid curable compositions

Abstract

Compositions containing an aryl phosphite and water to hydrolyze the aryl phosphite provide controlled and extended work time when used as hardening agents for the ambient temperature hardening of phenolic resins and for rapid hardening of such resins at modestly elevated temperatures. Pre-solvolysis with small quantities of water, alkanols of 1 to 4 carbon atoms or alkylene glycols of 2 to 4 carbon atoms improve compatibility of trisubstituted phosphites with the resin. Pre-hydrolysis of the phosphites as well as addition of furfuryl alcohol or alkylene glycols of 2 to 4 carbon atoms accelerate the hardening (curing) of the resin. Various compounds such as: carboxylic acid amides, urea, dicyandiamide, N-methylolated amides, N-alkyl 2-pyrrolidinones having 1 to 4 carbon atoms in the alkyl group, those having an internal epoxide group, alkanols, and Schiff bases retard the ambient temperature hardening of the resin with the aryl phosphite hardening agents.

Claims20

Dependent claims

A composition comprising:

A. an acid hardenable phenolic resin;
B. an aryl phosphite having the formula ##STR7## wherein each of R and X is aryl of 6 to 12 carbon atoms, and Y is a member selected from the group consisting of hydrogen, aryl of 6 to 12 carbon atoms, and alkyl of 1 to 12 carbon atoms, said phosphite being in an amount sufficient on hydrolysis thereof to harden the resin;
and
C. an additive selected from the group consisting of an organic nitrogen containing material having a pK.sub.a of 0 to 3, a material having an internal epoxide, and mixtures thereof, wherein the quantity of the additive is from about 1% to 10% by weight of the resin.

1 more element

Dependencies are inferred from the claim text.

Latent acid curable compositions

Life of this patent

Latent acid curable compositions

Life of this patent

Abstract

Claims20