Catalysis of amine curable polymers by high dielectric constant compounds
AssigneeThe Firestone Tire & Rubber Company
InventorSteven Edward Schonfeld
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Abstract
Amine curable polymers or prepolymers such as urethanes are cured by the use of a methylene dianiline complex or a racemic 2,3-di(4-aminophenyl) butane complex in the presence of a high dielectric constant catalytic compound which is relatively non-reactive with amines and isocyanates and exclusive of halogen containing foaming agents, halogen containing acids, and halogen containing flame retardants, so that increased cure rates, decreased cure temperatures or both are readily obtained.
Claims11
A mixture of a catalyst curable polymer, comprising,
- 100 parts by weight of an amine curable urethane polymer or prepolymer containing free isocyanate groups,
- from 0.8 to 1.2 equivalents of an amine containing curing agent based upon the free active groups of said amine curable polymer or prepolymer, said curing agent selected from a group consisting of a complex of 4,4'-methylene dianiline and a salt, said salt selected from the group consisting of sodium chloride, sodium bromide, sodium iodide, sodium nitrate, lithium chloride, lithium bromide, lithium iodide, lithium nitrate and sodium cyanide, and a complex of racemic 2,3-di(4-aminophenyl) butane and a salt, said salt selected from the group consisting of sodium chloride, sodium bromide, sodium iodide, potassium chloride, potassium bromide, potassium iodide, rubidium chloride, rubidium bromide, rubidium iodide, cesium chloride, cesium bromide and cesium iodide, the ratio of said dianiline or said butane to said salt in said complex being about 3 moles per 1 mole, and
- from 0.1 to about 35 parts of a curing agent catalyst having a high dielectric constant selected from the class consisting of oleic acid, benzaldehyde, adiponitrile, acetic anhydride, polydimethylsiloxane and diethyl sulfate.
A process for the catalytic curing of an amine polymer or prepolymer comprising, the steps of,
- adding to 100 parts by weight of a urethane polymer or prepolymer containing free isocyanate groups, from 0.8 to 1.2 equivalents of an amine containing curing agent based upon the free active groups of said amine curable polymer or prepolymer, said curing agent selected from a group consisting of a complex of 4,4'-methylene dianiline and a salt, said salt selected from the group consisting of sodium chloride, sodium bromide, sodium iodide, sodium nitrate, lithium chloride, lithium bromide, lithium iodide, lithium nitrate and sodium cyanide, and a complex of racemic 2,3-di(4-aminophenyl) butane and a salt, said salt selected from the group consisting of sodium chloride, sodium bromide, sodium iodide, potassium chloride, potassium bromide, potassium iodide, rubidium chloride, rubidium bromide, rubidium iodide, cesium chloride, cesium bromide and cesium iodide, the ratio of said dianiline or said butane to said salt in said complex being about 3 moles per 1 mole, and
- from 0.1 to about 35 parts of a curing agent catalyst having a high dielectric constant selected from the class consisting of oleic acid, benzaldehyde, adiponitrile, acetic anhydride, and polydimethylsiloxane, and
- curing said urethane polymer or prepolymer composition.
Dependencies are inferred from the claim text.