Control of cure rate of polyurethane resins

Claim 2

A curable composition comprising a hydroxy terminated polybutadiene, a polyisocyanate and an effective amount of a cure catalyst therefor, said catalyst comprising a metallo organic compound of the formula MR m where M is an m-valent metal selected from bismuth, lead, tin, arsenic, zinc, copper, cadmium or potassium and R is phenyl, tolyl, benzyl, naphthyl, alkyl of 1 to 20 carbon atoms or cycloalkyl of 5 to 20 carbon atoms and a carboxylic acid or a compound convertible to a carboxylic acid by reaction with Zerewitinoff active hydrogen.

Claim 3

A curable composition which comprises a liquid polyurethane prepolymer, a polyurethane prepolymer curing agent and an effective amount of a cure catalyst therefor, said catalyst comprising a metallo organic compound of the formula MR m wherein M, R and m are as defined in claim 1, and a carboxylic acid or a compound convertible to a carboxylic acid by reaction with Zerewitinoff active hydrogen.

Claim 4

A process for the control of the pot life and the curing rate of a polyurethane casting or molding resin which comprises admixing with a curable liquid polyurethane prepolymer and a polyurethane prepolymer curing agent and an effective amount of a catalyst, said catalyst comprising a metallo organic compound of the formula MR m wherein M, R and m are as defined in claim 1 and a carboxylic acid or a compound convertible to a carboxylic acid by Zerewitinoff active hydrogen.

Claim 5

An article of manufacture comprising the reaction products of a liquid polyurethane prepolymer, a polyurethane prepolymer curing agent and a cure catalyst therefor, said cure catalyst comprising a metallo organic compound of the formula MR m wherein M, R and m are as defined in claim 1 and a carboxylic acid or a compound convertible thereto by reaction with Zerewitinoff active hydrogen.

Claim 6

A curable composition as defined in claim 2 wherein the liquid polyurethane prepolymer is selected from: polyester polyols, alkane diols of from 2 to 20 carbon atoms, alkene diols, cycloalkylene diols, carbocyclic aromatic diols, heterocyclic containing diols, polyalkylene ether polyols, polyalkylene thioether polyols, polyalkylene ether-thioether polyols, polyalkylenearylene ether polyols, polyalkylenearylene thioether polyols, polyalkylenearylene ether-thioether polyols, polyesteramide polyols, polyamino alcohols, ethylene disulfide, liquid polysulfide polymers, or polysulfide polymers having glycol end caps; and the polyurethane prepolymer curing agent is selected from polyisocyanates; or the liquid polyurethane prepolymer is selected from isocyanate terminated moieties derived from: polyester polyols, alkane diols of from 2 to 20 carbon atoms, alkene diols, cycloalkylene diols, carbocyclic aromatic diols, heterocyclic containing diols, polyalkylene ether polyols, polyalkylene thioether polyols, polyalkylene ether-thioether polyols, polyalkylenearylene ether polyols, polyalkylenearylene thioether polyols, polyesteramide polyols, polyamino alcohols, ethylene disulfide, liquid polysulfide polymers, or polysulfide polymers having glycol end caps; and the polyurethane prepolymer curing agent is selected from: polyhydroxyl compounds, polythiols, polyamines, or hydroxy amines.

Claim 7

A curable composition as defined in claim 5 wherein the liquid polyurethane prepolymer is selected from: polyester polyols, polyether polyols; or polyester polyols and polyether polyols terminated with isocyanates.

Claim 8

A curable composition as defined in claim 2 wherein the compound convertible to a carboxylic acid by reaction with Zerewitinoff active hydrogen is a carboxylic acid anhydride.

Claim 9

A curable composition as defined in claim 5 wherein the compound convertible to a carboxylic acid by reaction with Zerewitinoff active hydrogen is a carboxylic acid anhydride.

Claim 10

A curable composition as defined in claim 6 wherein the compound convertible to a carboxylic acid by reaction with Zerewitinoff active hydrogen is a carboxylic acid anhydride.