Depolymerized natural rubber and process for preparation thereof
US5622998A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 12, 1995 |
| Grant date | Apr 22, 1997 |
| Priority date | — |
| Expiry date | Sep 12, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08C19/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A depolymerized natural rubber having a number-average molecular weight of from 2,000 to 50,000 obtained by the depolymerization of a deproteinized natural rubber. A process for the preparation of a depolymerized natural rubber comprises dissolving a deproteinized natural rubber into an organic solvent so as to give a concentration of from 1 to 30% by weight and then carrying out air oxidation of the resulting solution in the presence of a metallic catalyst. The depolymerized natural rubber can provide the same physical properties as ordinary vulcanized rubbers, exhibits no odor or color characteristic to natural rubbers and causes no immediate allergy induced by protein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.