Stabilizer mixture of chroman derivatives and inert organic solv

Details Stabilizer mixture of chroman derivatives and inert organic solv Stabilizer mixture of chroman derivatives and inert organic solv

1997-07-16

1998-11-17

Morgan, Kriellion S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524126, 524147, 524151, 524153, 25240024, 252403, 252409, C08K 515, C08K 553, C09K 1532

Patent

active

058377590

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a novel stabilizer mixture of chroman derivatives and inert organic solvents which may additionally contain organic phosphites or phosphonites and/or amines, for stabilizing organic material against the action of light, oxygen and in particular heat. The invention furthermore relates to microcapsules containing this stabilizer mixture of chroman derivatives and inert organic solvents and, if desired, organic phosphites or phosphonites and/or amines, which microcapsules can likewise be used for stabilizing organic material against the action of light, oxygen and in particular heat.
2. Description of the Related Art
DE-A 36 34 531 (1) discloses stabilizer mixtures of chroman derivatives (vitamin E, .alpha.-tocopherol) and organic phosphites or phosphonites for stabilizing plastics. However, the mixtures have the disadvantage of being unstable both during storage and after incorporation into the plastics. A decrease in the chroman derivative content, probably owing to hydrolysis reactions in the presence of traces of atmospheric moisture, and thus a reduction in the stabilizing action on the plastics is observed.
German Patent Application P 44 05 670.2 (2) recommends a stabilizer mixture of chroman derivatives, organic phosphites or phosphonites and amines for stabilizing organic material, in particular plastics, but this mixture likewise has inadequate stability during incorporation into the plastics.
The above stabilizer mixtures of the prior art furthermore have the major disadvantage of being liquids or pastes and thus being extremely difficult to mix with thermoplastics. Most plastics manufacturers and processors are furthermore unable to meter such additives in liquid form and require solid additives, which are readily weighable and easy to handle and admix.


SUMMARY OF THE INVENTION

It is an object of the present invention to provide a stable stabilizer mixture which can be used in the form of a solid.
We have found that this object is achieved by a stabilizer mixture which comprises ##STR4## where R.sup.1 is ##STR5## in which Z is C7- to C.sub.30 -alkyl, preferably C.sub.13 - to C.sub.19 -alkyl, --CH.sub.2 CH.sub.2 --S--(C.sub.8 - to C.sub.20 -alkyl), or ##STR6## and (b) an inert organic solvent for the chroman derivatives I from the group consisting of aliphatic, cycloaliphatic or aromatic hydrocarbons or halogenated hydrocarbons, silicone oils and vegetable and animal fats, preferably from 90:10 to 5:95, in particular from 60:40 to 10:90.


DETAILED DESCRIPTION OF THE INVENTION

Suitable chroman derivatives I are in particular 2,5,7,8-tetra-methyl-2-(2'-stearoyloxyethyl)chroman (R.sup.1 =--CH.sub.2 CH.sub.2 --O--CO--C.sub.17 H.sub.35) and especially .alpha.-tocopherols, preferably DL-.alpha.-tocopherol (R.sup.1 =--(CH.sub.2).sub.3 --CH(CH.sub.3)--(CH.sub.2).sub.3 --CH(CH.sub.3)-(CH.sub.2).sub.3 --C(CH.sub.3).sub.2)
Particularly suitable inert organic solvents (b) for the chroman derivatives I are dodecylbenzene poly(methylphenylsiloxanes) acids, such as soybean oil, colza oil, olive oil, sunflower oil, cottonseed oil, groundnut oil, linseed oil, rapeseed oil or fish oil.
These inert organic solvents (b) are normally heat-resistant at the usual temperatures at which additives are incorporated into plastics, ie. up to about 300.degree. C. They generally have low volatility and have, in particular, boiling points of above 80.degree. C.
The organic solvents (b) can also be employed in the form of mixtures of more than one of said species.
The novel stabilizer mixture may additionally comprise ##STR7## where R.sup.2 to R.sup.4 are each C.sub.2 - to C.sub.12 -alkyl, preferably C.sub.6 - to C.sub.11 -alkyl, in particular C.sub.8 - to C.sub.10 -alkyl, or C.sub.6 - to C.sub.18 -aryl, preferably phenyl, which may be substituted by C.sub.1 - to C.sub.18 -alkyl groups, preferably by one to three C.sub.4 - to C.sub.12 -alkyl groups, ##STR8## or a mixture of a phosphite II and a phosphonite III, and/or (d) one or more amines

REFERENCES:
patent: 4806580 (1989-02-01), Bock et al.
patent: 5585042 (1996-12-01), Knowles

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