| 摘要 |
A method is described for producing liquid rubber containing an impact-resistance modifier terminated by an epoxy group, the method comprising the reaction of an isocyanate-terminated prepolymer with an epoxy resin, which comprises 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. 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 obtained products are suitable for improving the impact resistance of epoxy resin compositions, particularly one-component or two-component epoxy resin adhesives. |
