Stabilizer composition of phosphite and lignin
US3948801A · kind A · utility
8Cited by
8References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1973 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Jun 13, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K15/34
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Stabilizing compositions comprising at least one triaryl phosphite, trialkyl phosphite or mixtures thereof and at least one modified lignin, the weight ratio of the phosphite to modified lignin is from 97/3 to 10/90. The modified lignins are produced by heat treating lignins in the presence of a nucleophile, such that a portion of the original guaiacyl structures are converted to catechols via a demethylation reaction. Elastomers may be protected against atmospheric degradation by the addition thereto of 0.01 to 5.0 parts by weight, preferably 0.25 to 2.0 parts, per 100 parts of elastomer of the stabilizing composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.