Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Nitrogen-containing reactant
Patent
1996-08-02
1998-03-10
Truong, Duc
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Nitrogen-containing reactant
528 59, 528 62, 528 65, 528 66, 528 73, 525113, 525424, 525425, 525426, 525428, C08G 7300
Patent
active
057262853
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to novel condensation and addition polymers having N,N'-bridged bistetramethylpiperidyloxy groups, to processes for their preparation and to their use as light stabilizers and as other stabilizers for organic material.
DE-A 27 19 131 describes polyesters formed from 1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine and esters of dicarboxylic acids, for example dimethyl succinate, as light stabilizers for plastics and coating materials. Oligomeric polyesters of this kind have become established on the market as conventional light stabilizers.
DE-A 27 19 131, moreover, describes polyesters formed from diols of the general formula ##STR2## in which Z.sup.5 is a C.sub.4 -C.sub.8 -alkylene bridge and from esters of dicarboxylic acids, as light stabilizers.
Unsatisfactory features of many of the prior art products are their inadequate compatibility with plastics, the insufficient duration of the protective effect, the inherent color of the substances, the tendency toward volatility and the thermal decomposition of the stabilizers when they are incorporated at elevated temperature.
It is an object of the present invention to provide light stabilizers and/or other stabilizers which provide more effective protection for organic material. A particular objective is to extend the duration of the protective effect, since it is this effect which is generally too short in the case of the polyesters of DE-A 27 19 131.
We have found that this object is achieved by condensation and addition polymers which contain as structural repeating unit N,N'-bridged bistetramethylpiperidyloxy groups of the formula I ##STR3## in which m is 2 or 3.
Particularly suitable polyesters are those of the general formula II ##STR4## in which
A is a direct bond, C.sub.1 -C.sub.18 -alkylene which may be interrupted by up to 8 nonadjacent oxygen atoms or bridge members of the formula --NR.sup.1 --, C.sub.2 -C.sub.18 -alkenylene, C.sub.3 -C.sub.12 -cycloalkylene which may be substituted by up to 3 C.sub.1 -C.sub.4 -alkyl groups, C.sub.6 -C.sub.18 -cycloalkylalkylene which may be substituted by up to 3 C.sub.1 -C.sub.4 -alkyl groups, phenylene, biphenylene or naphthylene which may be substituted by up to 3 C.sub.1 -C.sub.8 -alkyl groups or hydroxyl groups, C.sub.7 -C.sub.22 -phenylalkylene or C.sub.7 -C.sub.22 -diphenylalkylene which may be substituted by up to 3 C.sub.1 -C.sub.8 -alkyl groups or hydroxyl groups, or is a divalent five-or six-membered unsaturated or saturated heterocyclic radical containing up to 3 heteroatoms from the group consisting of nitrogen, oxygen and sulfur and which may additionally be benzo-fused and substituted by up to 3 C.sub.1 -C.sub.8 -alkyl groups or hydroxyl groups, and for which in each case one oxygen atom may also be inserted between the bridge member A and one or both flanking carbonyl groups, and
Outstanding results are also achieved with polyurethanes of the general formula III ##STR5## in which B is C.sub.2 -C.sub.18 -alkylene which may be interrupted by up to 8 non-adjacent oxygen atoms, C.sub.4 -C.sub.18 -alkenylene, C.sub.5 -C.sub.12 -cycloalkylene which may be substituted by up to 3 C.sub.1 -C.sub.4 -alkyl groups, C.sub.6 -C.sub.18 -cycloalkylalkylene which may be substituted by up to 3 C.sub.1 -C.sub.4 -alkyl groups, or C.sub.7 -C.sub.22 -phenylalkylene or C.sub.7 -C.sub.22 -diphenylalkylene which may be substituted by up to 3 C.sub.1 -C.sub.8 -alkyl groups,
Outstanding results are also achieved with polyethers of the general formula IV ##STR6## in which D is C.sub.2 -C.sub.18 -alkylene which may be interrupted by up to 8 non-adjacent oxygen atoms, C.sub.4 -C.sub.18 -alkenylene, C.sub.5 -C.sub.12 -cycloalkylene which may be substituted by up to 3 C.sub.1 -C.sub.4 -alkyl groups, C.sub.6 -C.sub.18 -cycloalkylalkylene which may be substituted by up to 3 C.sub.1 -C.sub.4 -alkyl groups, or C.sub.8 -C.sub.22 -phenylalkylene which may be substituted by up to 3 C.sub.1 -C.sub.8 -alkyl groups,
Outstanding results are also achieved with polycarbonates of the general formula V
REFERENCES:
patent: 4429077 (1984-01-01), Karrer et al.
Aumuller Alexander
Trauth Hubert
BASF - Aktiengesellschaft
Truong Duc
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