Preparation of liquid TDI for compositions

Claim 1

A process for forming a liquid of a solid toluene diisocyanate tar by-product in the preparation of toluene diisocyanate, which comprises 1. 1-1. heating the toluene diisocyanate tar having a softening point of about 200° C or higher, at a temperature above the softening point of said toluene diisocyanate tar, or 1-2. withdrawing the toluene diisocyanate tar having a softening point of about 200° C or higher, in a molten condition from the toluene diisocyanate producing apparatus, and then the molten toluene diisocyanate tar at a temperature above the softening point of said toluene diisocyanate tar in a substantially anhydrous condition with an aromatic solvent selected from the group consisting of creosote oil, anthracene oil, pitch oil, methyl naphthalene oil, crystal-freed naphthalene oil, absorbing oil, washing oil, and hydrogenated cracked gasoline having a boiling point of above 200° C, to form a solution of said toluene diisocyanate tar, 2. pulverizing the above-define toluene diisocyanate tar at a temperature below the softening point thereof to a stirrable size, and 2-1. mixing the pulverized toluene diisocyanate tar at a temperature below the softening point thereof in a substantially anhydrous condition with the above-defined aromatic solvent to form a dispersion of said toluene diisocyanate tar, and then maintaining the temperature of the dispersion at a temperature above the softening point thereof for at least 5 minutes to form a solution of said toluene diisocyanate tar, or 2-2. mixing the pulverized toluene diisocyanate tar at a temperature above the softening point thereof in a substantially anhydrous condition with the above defined aromatic solvent to form a solution of the toluene diisocyanate tar, or 3. pulverizing the above-defined toluene diisocyanate tar at a temperature below the softening point thereof in a substantially anhydrous condition in the above-defined aromatic solvent to form a dispersion of said toluene diisocyanate tar.