Polyurethane hotmelt adhesives with reactive acrylic copolymers
US5866656A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1997 |
| Grant date | Feb 2, 1999 |
| Priority date | — |
| Expiry date | Sep 8, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2170/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A solvent-free one-part hot melt polyurethane adhesive or sealant composition which is solid at room temperature comprising 10 to 70% by weight of a urethane prepolymer having an isocyanate content of 0.25 to 15% and an isocyanate index greater than 1 and 30 to 90% by weight of an ethylenically unsaturated polymer having a number average molecular weight of 4,000 to 15,000 as determined by Gel Permeation Chromatography using a PL Gel,Mixed 10 micron column, a Shimadzu Model RID 6A Detector with a tetrahydrofuran carrier solvent at a flow rate of 1 milliliter per minute, the polymer containing sufficient hydroxyl functionality to provide an OH number of 5 to 15.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.