Polymeric light stabilizers for plastics
US4233412A · kind A · utility
55Cited by
18References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1978 |
| Grant date | Nov 11, 1980 |
| Priority date | — |
| Expiry date | Nov 7, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L101/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Condensation polymers or addition polymers which contain sterically hindered polyalkylpiperidine groups are proposed as light stabilizers for plastics. The polymers concerned are relatively low-molecular polymers and a difunctional derivative of a polyalkylpiperidine is additionally used for the manufacture of these. The piperidine radical can be present in the main chain or as a side group of the polymeric stabilizer. Polymeric stabilizers of this type do not tend to migrate out of the plastic or to be removed by extraction; they are therefore very permanent in use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.