Heat curable compositions
US4647646A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1985 |
| Grant date | Mar 3, 1987 |
| Priority date | — |
| Expiry date | Aug 2, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/5024
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Heat curable compositions, particularly solvent-based adhesive compositions suitable for use e.g. in flocking processes, are described and claimed. Known heat curable compositions require a relatively high temperature for cure. A one part non-toxic storage stable composition is provided which is cured by heat and comprises a polyurethane prepolymer formed from the reaction between a first NCO terminated prepolymer, an oxime blocking agent and a trifunctional primary amino compound used in a substantially stoichiometric amount to the amount of isocyanate groups of the first prepolymer available for reaction. The quantity of blocking agent is so chosen that statistically only one functional group of the triamine is reacted with the NCO groups of the first prepolymer available for reaction leaving two amine groups available for reaction with isocyanate groups of the prepolymer when they are unblocked by heating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.