Polyurethane hot melt adhesive
US5618904A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1993 |
| Grant date | Apr 8, 1997 |
| Priority date | — |
| Expiry date | Dec 29, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S528/905
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Described herein is a one-part hot melt adhesive comprising the reaction product of: (a) a polyester polyol with an equivalent weight in the range of from about 250 to about 3,000; (b) a polyisocyanate; and (c) at least about 1 weight percent hydroquinone bis (2-hydroxyethyl) ether; wherein the isocyanate content of the resulting product is at least about 0.5 percent. Also described is a one-part hot melt adhesive comprising the reaction product of: (a) a polyether polyol; (b) a polyisocyanate; and (c) hydroquinone bis (2-hydroxyethyl) ether; wherein the isocyanate content of the resulting product is at least about 0.5 percent. It has been discovered that the compositions of the invention provide adhesives with increased resistance to softening at high temperatures (e.g., above about 70.degree. C.) after curing. Such adhesives have a variety of uses in applications wherein the applied adhesive is exposed to high temperatures, but are particularly useful in automotive applications, wherein the exterior or interior of the automobile may be exposed to such temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.