Aza-adamantane compound stabilizers for organic polymer composit

Details Aza-adamantane compound stabilizers for organic polymer composit Aza-adamantane compound stabilizers for organic polymer composit

1976-10-04

1978-04-04

Hoke, V. P.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

60 458R, 260 458NT, 260 458NZ, 260 458SN, C08K 534, C08K 535

Patent

active

040827232

ABSTRACT:
Certain aza-adamantane compounds are suitable for stabilizing polymers against degradation by light and heat.
It is known that ultraviolet radiation, especially in the near-ultraviolet range, has an adverse effect on the aspect and physical properties of organic polymers. Thus, for example, polyolefins and polyurethane elastomers tend to heavy degradation when they are exposed to light, that is, sun rays or ultraviolet radiation. Polyvinyl chloride and polyvinylidene chloride are discolored and also degraded under the above conditions, and polyamides too are often subjected to photo-degradation.
Numerous stabilizers have been hitherto proposed for stabilizing synthetic polymers against photo-degradation, for example benzophenone and benzotriazole compounds for polyolefins, phenol and benzophenone compounds for polyurethanes, and salts of barium or cadmium and organic tin compounds for polyvinyl chloride and polyvinylidene chloride. Recently, 2,2,6,6-tetraalkylpiperidine derivatives have been proposed as stabilizers. However, on incorporation into the polymer, the dust of the latter compounds, due to their heavy basicity, may physiologically affect the mucous membranes.
It has now been found that aza-adamantane compounds of the structure ##STR1## where at least either A is a nitrogen atom and B an optionally substituted methylene group, or A is an optionally substituted methine group and B an imino group, are excellent stabilizers for polymers.

REFERENCES:
patent: 3812065 (1974-05-01), Minieri
patent: 3879396 (1975-04-01), Ramey et al.
patent: 3883477 (1975-05-01), Stephen
patent: 3912742 (1975-10-01), Stephen

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