Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1997-07-10
1999-10-12
Kight, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
544198, 544209, 546184, 546242, C08J 545, C07D40300, C07D21100, C07D21136
Patent
active
059656417
ABSTRACT:
A description is given of a process for stabilising an organic polymer against ozone in the ambient air, which comprises adding to the polymer as stabiliser a monomeric sterically hindered piperidine compound, or an oligomeric or polymeric sterically hindered piperidine compound containing one or several triazine units, or a secondary sterically hindered piperidine compound, the piperidine compound containing in any case at least one unit of formula I ##STR1## wherein G is hydrogen or methyl, and G.sub.1 and G.sub.2 are hydrogen, methyl or, taken together, oxygen.
With this process it is possible to make a more accurate prediction of the service time of the polymer and it helps to avoid unnecessarily high dosages of the stabiliser.
REFERENCES:
patent: 3640928 (1972-02-01), Murayama et al.
patent: 4086204 (1978-04-01), Cassandrini et al.
patent: 5665885 (1997-09-01), Steinmann
Derwent Abstract 94-211993 for JP-A 6148928.
Derwent Abstract 93-240115 for JP-A 5163398.
Derwent Abstract 91-122991 for JP-A 3064328.
Derwent Abstract 94-313922 for JP-A 6240200.
R.P. Lattimer et al., Ozone Degradation & Antiozonants, G. Scott (Ed.) Atmospheric Oxidation & Antioxidants, vol. 2, Chapter 7, 363.
Ciba Specialty Chemicals Corporation
Covington Raymond
Hall Lurther A. R.
Kight John
Mansfield Kevin T.
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