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:
Jul. 23, 2002
Filed:
Feb. 05, 2001
Jian-ping Huang, Apex, NC (US);
Stephen R. Webb, Clayton, NC (US);
Miriam H. Zietlow, Apex, NC (US);
Lord Corporation, Cary, NC (US);
Abstract
Disclosed is a two-part polyurethane structural adhesive and method of bonding structural components, that exhibits at least 25 minutes of open time at 32° C. in large beads and cures to high strength under ambient conditions. The adhesive composition in one part is an isocyanate or isocyanate prepolymer and in a second part is a polyol mixture (I) or (II), wherein 75% to 100% by weight of the polyol mixture (I) or (II) are polyols having secondary hydroxyl functionality and the polyol mixture (I) or (II) contains a long chain secondary polyol defined hereinbelow. The polyol mixture in one embodiment is substantially absent short chain polyols having functionality of 2, and includes an amount from 30% to 80 % by weight on total polyol weight in (I) of long chain secondary polyol of molecular weight from 2000 to 12000 and from 20% to 70% by weight on total weight of the polyol mixture and of a short chain secondary polyol with functionality greater than 2 and a molecular weight of from 90 to 800. In another embodiment, 5% to 80% of a long chain secondary polyol of molecular weight of from 2000 to 12000 is present together with 5% to 70% of a short chain secondary polyol having a functionality of greater than 2, and 5% to 70% of a short chain secondary polyol having a functionality of 2 and a molecular weight of from 90-800.