Sag control of high solid polyurethane clearcoats by urea thixotrope/silica systems
Patent 4528319 Issued on July 9, 1985. Estimated Expiration Date: 
July 20, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 20, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesHigh solids internally U.V. stabilized melamine cured urethane paint Patent #: 4387194 InventorsAssigneeApplicationNo. 06/633055 filed on 07/20/1984US Classes:524/540, Solid polymer or SICP derived from at least one phenol or inorganic phenolate reactant524/500, Containing two or more solid polymers; solid polymer or SICP and a SICP, SPFI, or an ethylenic reactant or product thereof524/871, N=C=X containing reactant forming a solid polymer or SICP in the presence of a nonreactant material (X is chalcogen)524/872, Two or more N=C=X containing reactants (other than conventional isomer mixtures)524/875With two or more alcohol hydroxyl compoundsExaminersPrimary: Jacobs, Lewis T.Attorney, Agent or FirmInternational ClassesC09D 175/04 (20060101)C08K 3/00 (20060101) C08K 3/36 (20060101) AbstractNovel, high solids urethane clearcoat compositions having improved flow characteristics by the incorporation of a flow control system composed of urea thixotrope/silica additives. The urea thixotrope constituent is prepared by reacting a polyether polyol with a stoichiometric excess of a saturated cyclic aliphatic polyisocyanate to produce isocyanate-terminated prepolymers. These prepolymers are then modified by reaction with an ethanolamine to form urea endcapped thixotropes which are compatible in structure with any urethane clearcoat system. A combination of one of these urea thixotropes and a finely divided transparent silica is used effectively to reduce sagging of high solids urethane clearcoat systems. In fact, the combination of the two components produces a synergistic effect which is greater than that expected from any one of the components in the flow control system.Field of SearchContaining two or more solid polymers; solid polymer or SICP and a SICP, SPFI, or an ethylenic reactant or product thereofSolid polymer or SICP derived from at least one phenol or inorganic phenolate reactant N=C=X containing reactant forming a solid polymer or SICP in the presence of a nonreactant material (X is chalcogen) Two or more N=C=X containing reactants (other than conventional isomer mixtures) With two or more alcohol hydroxyl compounds | |
