Epoxy resins having reversible crosslinks
US4882399A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1987 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Aug 21, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G59/4064
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for the preparation of insoluble, infusible epoxy resins containing reversible crosslinks comprising the steps of: PA0 (a) forming a reaction mixture of PA1 (i) an epoxy compound having two or more epoxy groups, and PA1 (ii) a crosslinking agent containing two or more epoxy-reactive groups and further containing a disulfide bond, said crosslinking agent being selected from compounds having the formula EQU Q--X--S--S--X--Q PA1 where Q is an epoxy-reactive functional group selected from ##STR1## and X is a divalent aromatic or aliphatic hydrocarbon radical of one to ten carbon atoms, and PA0 (b) curing said reaction mixture under conditions conductive to the formation of a crosslinked resin. The epoxy resin can be solubilized by cleavage of the disulfide bond by reduction in the presence of a solvent. The resultant thiol groups can be reoxidized to form the disulfide linkages or can be modified by other reactions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.