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US 5,478,790 AGranted
Blocked tin catalyst system for use with mercapto resin/acrylic resin blends
AssigneeAshland Oil, Inc.
InventorsDavid B. Norby, Kimberly S. Baker
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AssigneeAshland Oil, Inc.
InventorsDavid B. Norby, Kimberly S. Baker
Estimating the term…
In its broadest aspects, the present invention is directed to a tin or bismuth catalyst/mercapto complex as disclosed in U.S. Pat. No. 4,788,083 which catalyst complex exhibits substantially the same stability and activity after extended periods of storage as it exhibits upon initial formation. Such long term storage stability is achieved by restricting the vehicle for the catalyst complex to one that will not react with said mercapto compound upon extended storage of said catalyst system. Advantageous such vehicles include aromatic hydrocarbons and terpenes. Importantly, ketone vehicles are excluded from the catalyst complex formulation. Preferred vehicles include toluene, xylene, turpentine, d-limonene, aromatic petroleum distillates, and mixtures thereof. Corresponding method for forming the stabilized catalyst complex forms yet further aspect of the present invention. As another aspect of the present invention, the present invention is directed to polymercapto resin/polyisocyanate formulations as disclosed in U.S. Pat. No. 4,753,825 which are more stable by dint of the elimination of ketonic and like vehicles that are involved in unintended side reactions with the mercapto content thereof. As a further aspect of the present invention, the cure rate of such polymercapto resin/polyisocyanate formulations can be retarded to commercially accepted levels by blending acrylic resins therewith. Advantageously, the stabilized tin catalyst complexes can be used in the instant controlled cure rate polymercapto resin/polyisocyanate formulations.
In a coating formulation curable with heat or amine and containing one or more of a polyol or polymercapto resin, a polyisocyanate cross-linking agent, and organic vehicle, and a tin or bismuth catalyst complexed with a molar excess of a mercapto compound, the improvement which comprises said organic vehicle restricted to a non-carbonyl vehicle that will not react with said polymercapto resin or said mercapto compound upon extended storage of said catalyst complex.
In method for making a coating formulation curable with heat or amine and containing one or more of a polyol or polymercapto resin, a polyisocyanate cross-linking agent, and organic vehicle, and a tin or bismuth catalyst complexed with a molar excess of a mercapto compound, the improvement which comprises restricting said organic vehicle to a non-carbonyl vehicle that will not react with said polymercapto resin or said mercapto compound upon extended storage of said catalyst.
In a catalyst system of a tin or bismuth catalyst complexed with a molar excess of a mercapto compound which complex is dispersed in an organic vehicle, the improvement for maintaining said catalyst complex upon extended storage thereof which comprises said vehicle being restricted to a non-carbonyl vehicle that will not react with said mercapto compound upon extended storage of said catalyst system.
A method for improving the storage stability of a tin or bismuth catalyst complexed with a molar excess of a mercapto compound which complex is dispersed in an organic vehicle, the improvement which comprises restricting said vehicle to a non-carbonyl vehicle that will not react with said mercapto compound upon extended storage of said catalyst complex.
Dependencies are inferred from the claim text.