Reactive liquid rubber made of blocked isocyanate-terminated prepolymers with glycol scavenger
US9567424B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2013 |
| Grant date | Feb 14, 2017 |
| Priority date | — |
| Expiry date | Nov 7, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09J175/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method is described for producing liquid rubber containing an impact-resistance modifier terminated by epoxy groups, the method including the reaction of an isocyanate-terminated prepolymer with an epoxy resin, which includes an epoxy compound including a primary or secondary hydroxyl group, in the presence of a compound selected from anhydrides, ketones and aldehydes as glycol scavengers, wherein the isocyanate-terminated prepolymer, the epoxy resin and the glycol scavenger are mixed with one another, or the epoxy resin is reacted with the glycol scavenger, before they are mixed with the isocyanate-terminated prepolymer. Gelling in the reaction mixture is avoided by the method. The resulting products are suitable for improving the impact resistance of epoxy resin compositions, particularly one-component or two-component epoxy resin adhesives.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.