The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 08, 2022
Filed:
Jun. 30, 2017
Dow Global Technologies Llc, Midland, MI (US);
Jing Ji, Shanghai, CN;
Felipe A. Donate, Midland, MI (US);
Xin Jiang, Shanghai, CN;
Cheng Shen, Shanghai, CN;
Kazuyuki Hasegawa, Yokohama, JP;
Jacob Crosthwaite, Midland, MI (US);
Rebecca J. Wachowicz, Midland, MI (US);
Dow Global Technologies LLC, Midland, MI (US);
Abstract
A prepolymer comprising acid functionality is made by a process comprising the step of contacting: (i) a di-isocyanate, (ii) a polyol containing an acid group, (iii) a polyol without an acid group, and (iv) a metal salt catalyst, the contacting conducted under reaction conditions and in a solvent consisting essentially of: (A) a dialkyl amide, and (B) optionally, an aprotic glycol ether. The prepolymer is useful in the preparation of water-based polyurethane dispersions, and certain of the solvent blends consisting essentially of a dialkyl amide and an optional aprotic glycol ether are azeotropic or pseudo-azeotropic.