Compositions containing hydrophobic modified isocyanate functional prepolymer containing adhesives
US11732080B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2018 |
| Grant date | Aug 22, 2023 |
| Priority date | — |
| Expiry date | Sep 11, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09J2301/312
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed are curable compositions containing isocyanate functional prepolymer containing two part adhesives wherein the prepolymers contain in their backbones hydrophobic segments and the curative part comprises one or more oligomeric or polymeric compounds having more than one isocyanate reactive groups; and one or more low molecular weight compounds having more than one isocyanate reactive groups wherein the low molecular weight compounds and the amount of such low molecular weight compounds are selected to such that the composition after full cure exhibits a ratio of modulus (e.g., Young's modulus or shear storage modulus) measured at −35° C. to the modulus measured at 23° C. of less than 10. The cured compositions exhibit higher stiffness across the common use temperature range and improved hydrolytic stability especially when exposed to elevated temperatures. Also disclosed are methods of bonding substrates together utilizing such compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.