Thermooxidative stabilization of polymers with a N4-alkylated oxo-piperazinyl-triazine
US5098944A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1990 |
| Grant date | Mar 24, 1992 |
| Priority date | — |
| Expiry date | Sep 11, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/34926
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An oxo-piperazinyl triazine with three piperazinone substituents, each of which has an alkylated N.sup.4 atom ("MPIP-T"), used in an amount no more than 0.2 phr, and without any secondary stabilizer (hence referred to as a "virgin MPIP-T"), and in particular, without any hindered phenol antioxidant, or phosphorous acid ester, simultaneously provides thermooxidative stability and stability against degradation by UV light along with acceptable melt processability. Further, the virgin MPIP-T allows (i) uninterrupted operation of a die or mold while maintaining the surfaces of the cavities essentially contaminant-free; and, (ii) excellent AO stabilization which is equivalent to that obtained with a premier hindered phenol AO, and superior to that obtained with the premier oligomeric piperidinyl-triazine compound, when each stabilizer is used in the same amounts by weight in a thermoplastic synthetic resinous substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.