Claims
- 1. An N,N'-bridged bistetramethylpiperidinyl compound of the formula Ia ##STR12## wherein m is 2 or 3; R.sup.8 is a group of the formula --A--R.sup.3 ;
- A is oxygen or a bridging member of the formula --NR.sup.4 --, --NR.sup.5 --CO--, --O--CO--, --O--CO--NR.sup.5 --, or --O--CO--O--;
- R.sup.3 is hydrogen; C.sub.1 -C.sub.20 -alkyl which optionally is interrupted by up to 10 non-neighboring oxygen atoms or bridging members of the formula --NR.sup.4 -- and by up to 3 carbonyl groups; C.sub.2 -C.sub.20 -alkenyl; C.sub.3 -C.sub.12 -cycloalkyl which optionally is substituted by up to 3 C.sub.1 -C.sub.4 -alkyl groups; phenyl which optionally is substituted by up to 3 C.sub.1 -C.sub.6 -alkyl groups or hydroxyl groups; C.sub.7 -C.sub.18 -phenylalkyl which optionally is substituted by up to 3 C.sub.1 -C.sub.4 -alkyl groups or hydroxyl groups; C.sub.6 -C.sub.18 -cycloalkylalkyl which optionally is substituted by up to 3 C.sub.1 -C.sub.4 -alkyl groups; or a five-membered or six-membered unsaturated or saturated heterocyclic ring having up to 3 hetero atoms selected from the group consisting of nitrogen, oxygen, and sulfur, which optionally is benzofused and substituted by up to 3 C.sub.1 -C.sub.6 -alkyl groups or hydroxyl groups; with the proviso that R.sup.3 is not hydrogen if A is the bridging member --NR.sup.4 --;
- R.sup.4 is C.sub.1 -C.sub.20 -alkyl; C.sub.2 -C.sub.20 -alkenyl; C.sub.3 -C.sub.12 -cycloalkyl which optionally is substituted by up to 3 C.sub.1 -C.sub.4 -alkyl groups; C.sub.7 -C.sub.18 -phenylalkyl which optionally is substituted by up to 3 C.sub.1 -C.sub.4 -alkyl groups, or C.sub.6 -C.sub.18 -cycloalkylalkyl which optionally is substituted by up to 3 C.sub.1 -C.sub.4 -alkyl groups;
- R.sup.5 is hydrogen or C.sub.1 -C.sub.4 -alkyl;
- R.sup.9 is a group of the formula --B--R.sup.3 ;
- B is a bridging member of the formula --NR.sup.4 --, --NR.sup.5 --CO--, or --O--CO--O--; and
- R.sup.3, R.sup.4, and R.sup.5 have the above-mentioned meanings.
- 2. An organic material stabilized to the action of light, oxygen and heat, containing from 0.01 to 5% by weight, based on the amount of the organic material, of one or more N,N'-bridged bistetramethylpiperidinyl compounds Ia as claimed in claim 1.
- 3. A plastic or coating stabilized to the action of light, oxygen and heat, containing from 0.01 to 5% by weight, based on the amount of the plastic or coating, of one or more N,N'-bridged bistetramethylpiperidinyl compounds Ia as claimed in claim 1.
- 4. A method of stabilizing an organic material, comprising adding to said organic material the N,N'-bridged bistetramethylpiperidinyl compound of claim 1.
- 5. The method of claim 4, wherein said organic material is a plastic or coating.
Priority Claims (1)
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44 03 085 |
Feb 1994 |
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Parent Case Info
This is a Division of application Ser. No. 08/669,318, filed on Jul. 9, 1996, U.S. Pat. No. 5,714,611, which was filed as International Application No. PCT/EP95/00205, filed on Jan. 20, 1995.
US Referenced Citations (2)
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Date |
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3940363 |
Murayama et al. |
Feb 1976 |
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4234734 |
Karrer |
Nov 1980 |
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Foreign Referenced Citations (1)
Number |
Date |
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62-075526 |
Apr 1987 |
JPX |
Non-Patent Literature Citations (2)
Entry |
Khim. Geterot. Soedinenii, No. 12, p. 1250, Dec. 1981, L.M. Kostochka, et al., Photochemical Oxidation of 1,2,2,6,6-Pentamethy-4-Piperidol by Ketones. |
Khim. Geterot. Soedinenii, No. 12, pp. 1280-1284, Dec. 1982, A.M. Belostotskii, et al., "Pathways of Photooxidation of 1,2,2,6,6-Pentamethyl-4-Piperidol by Keytones". |
Divisions (1)
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669318 |
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