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:
May. 19, 1992
Filed:
Apr. 09, 1991
Jeffrey R Quay, Kutztown, PA (US);
Sherri L Bassner, Landsdale, PA (US);
Thomas M Santosusso, Macungie, PA (US);
Air Products and Chemicals, Inc., Allentown, PA (US);
Abstract
This invention relates to polyurethane coatings formed from prepolymers made by reacting polyisocyanates with long chain polyols having an average functionality of greater than 2. The resulting prepolymers have equivalent weights greater than about 250 grams per equivalent and preferably greater than about 350 grams per equivalent. An excess of polyisocyanate is reacted with the polyol component at an equivalent ratio of greater than 4:1 equivalents isocyanate per equivalent of polyol. Excess polyisocyanate is then removed from the prepolymer. The resulting polyurethane prepolymers are chain extended with compounds having active hydrogen atoms such as water, amines or short chain polyhydroxy compounds, e.g., diols to form the resulting coatings.