Prepolymers having maleimide functions the process for preparing them and their uses
US6271339A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1997 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Sep 12, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/121
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
These prepolymers having maleimide functions (f) consist in the reaction products of at least one maleic anhydride represented by formula (I); of at least one compound (II) having at least one --NH.sub.2 function and at least another function F selected from the group consisting of --OH, --NH.sub.2, --NH--, --COOH, --COOR.sup.3 or --OOCR.sup.3 ; of at least one compound (III) capable of forming the chain of the prepolymers by polycondensation and/or polyaddition, said compound(s) (II) having first reacted with said maleic anhydride(s) (I) in order to open the maleic anhydride rings with formation of maleamic acid functions (f'), said maleamic acid functions having then been at least partially closed again under the action of heat into maleimides N-substituted by groups functionalized by a function F, the chain of said prepolymers having been formed by polycondensation and/or polyaddition of the N-substituted maleimide formed bearing the function F; of compound(s) (III) of uncyclized products bearing or not a function F formed simultaneously with said N-substituted maleimides of maleic anhydride(s) (I) which could have remained in excess after their opening by compound(s) (II); the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.