Polyurethane crosslinkers, and the process for preparing and using the same
Patent 4403085 Issued on September 6, 1983. Estimated Expiration Date: 
December 14, 2001. 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.
December 14, 2001. 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 ReferencesInventorsAssigneeApplicationNo. 06/330290 filed on 12/14/1981US Classes:528/45, From at least one blocked -N=C=X group427/239, Metal base427/385.5, Resin, resin precursor, rubber, or hardenable oil-containing coating428/425.8, Next to free metal525/124, Blocked isocyanate reactant525/403, Solid polymer is derived from 1,2-epoxy compound containing only one 1,2 epoxy group as sole reactant and wherein none of the reactants contains a plurality of methylol groups or derivatives thereof525/440, Mixed with -N=C=X reactant or polymer derived therefrom (X is chalcogen); or wherein solid polymer is derived from a -N=C=X reactant and also a polycarboxylic acid or derivative and a polyhydroxy reactant525/453, Solid polymer derived from -N=C=X reactant and polyhydroxy reactant525/454, Mixed with carboxylic acid or derivative reactant or polymer derived therefrom; or with heterocyclic reactant containing more than one heterocyclic ring; or polymer therefrom528/66Reactant having two -XH groups contains two or more -C-X-C- groups or two or more carboxylic acid ester groupsExaminersPrimary: Kight, III, JohnAssistant: Moore, M. L. Attorney, Agent or FirmInternational ClassesC08G 18/00 (20060101)C08G 18/08 (20060101) C08G 18/10 (20060101) C08G 18/66 (20060101) C08G 18/80 (20060101) AbstractA polyurethane crosslinker is provided by reacting a partially-blocked diisocyanate and a hydroxyl-terminated, carboxyl group-containing polyurethane precursor. The precursor is a reaction product of a diol containing a carboxyl group and another diol of high molecular weight, and a diisocyanate. The instant crosslinkers are particularly useful in water-based coating compositions for metal containers.Field of SearchFrom at least one blocked -N=C=X group | |
