Process for production of polycarbodiimide resin powder
US5650476A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1995 |
| Grant date | Jul 22, 1997 |
| Priority date | — |
| Expiry date | Oct 11, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2140/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for producing a polycarbodiimide resin powder, which includes reacting an organic diisocyanate in the presence of a carbodiimidization catalyst in a solvent to produce a polycarbodiimide resin and obtaining the resin in a powder form, where the organic diisocyanate is represented by the following formula ##STR1## where R.sub.1 is a lower alkyl group or a lower alkoxyl group, or ##STR2## where R.sub.2 and R.sub.3 are independently a hydrogen atom, a lower alkyl group or a lower alkoxyl group, and X is an oxygen atom or a methylene group, or ##STR3## where R.sub.4 and R.sub.5 are independently a hydrogen atom, a lower alkyl group or a lower alkoxyl group; the solvent is a mixed solvent of a good solvent to polycarbodiimide resin and a poor solvent to the resin, having a precipitation number of 30-80; and when the reaction has reached a certain stage, the reaction system is cooled to make the system a slurry of a polycarbodiimide, and then the polycarbodiimide is obtained in a powder form.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.