Thermal stabilized resin compositions

Details Thermal stabilized resin compositions Thermal stabilized resin compositions

1996-06-26

1998-12-15

Morgan, Kriellion S.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524 96, 524 97, C08K 535

Patent

active

058498206

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to stabilized resin compositions. More particulary, the invention relates to stabilized resin compositions having excellent stability to deterioration by thermal oxidation.


BACKGROUND ART

Many polymer materials tend to deteriorate to low molecular weight chains upon exposure to heat or light due to thermal oxidation with oxygen.
Thermal oxidation depends on the structure of the resins, and it is possible to estimate the difference in thermal stability based on the difference in structure.
Moreover, the thermal stability requirements of a single resin will often depend on its intended use, since the environment in which the resin is used, particularly the temperature and light conditions, can differ depending on the use of the final product made from the resin.
Another factor which can dominate the thermal stability requirement is whether the resin will be used in a molding process.
Even when molding materials are used in circumstances that are not normally extreme, it is essential to give thermal stability to a resin when it is molded at a temperature which is close to or higher than its degradation temperature.
For example, even when a partial structure of an aromatic polymer has excellent thermal stability and stiffness due to its high glass transition temperature, many problems can be encountered commercially because the resin degradation temperature is similar to the processing temperature.
Some resins having a polar site in their chain structure, or having an extremely low glass transition temperature, also have thermal stability problems when molded or used. These differences in thermal stability, even in resins having the same structure, act as a quality difference which can dominate the competitiveness of commodities made from such resins.
One solution which has been proposed is to incorporate stabilizers (thermal stabilizer, UV stabilizer) into resins in order to improve their stability.
Stabilizers such as thermal stabilizers, UV stabilizers, hydrolysis stabilizers, and antistatic agents have been developed and it is possible to choose them based on the product end use and/or the particular type of stability desired, i.e., heat or light stability.
Generally, the most frequently encountered form of degradation is from heat, especially when the resin is molded or used. Accordingly, various methods have been proposed in order to improve the thermal stability of resins such as modification of resin structure and addition of stabilizers.
U.S. Pat. No. 3,723,427 discloses a tris(hydroxylbenzyl) cyanurate stabilizer also known as a hindered phenolic primary thermal stabilizer. U.S. Pat. No. 3,758,549 proposes a thioester type secondary thermal stabilizer and discloses mixing the secondary stabilizer with a phenolic primary thermal stabilizer.
U.S. Pat. No. 3,966,675 and U.S. Pat. No. 4,414,408 disclose improving resin stability by mixing a primary stabilizer with a secondary stabilizer to provide a "synergistic" effect.
U.S. Pat. No. 4,069,200 discloses a method to improve the thermal stability of polyolefin resin by using a single hindered phenol primary thermal stabilizer, such as 6-t-butyl-2,3-dimethyl-4-(dimethylaminomethyl)-phenol, 6-t-octyl-2,3-dimethyl-4-(dimethylaminomethyl)-phenol, 6-t-butyl-4-(dimethylaminomethyl)-5,6,7,8-tetrahydro-1-naphthol, 5-t-butyl-2,3-dimethyl-4-hydroxybenzylphosphonate or by mixing the above-mentioned hindered phenol type primary thermal stabilizer with a thioester type secondary thermal stabilizer such as dilaurylthiodipropionate or distearylthiodipropionate.
U.S. Pat. No. 4,185,003 discloses a method to improve the stability of a copolyetherester by mixing a phenol type thermal stabilizer such as N,N'-hexamethylenebis(3,5-di-t-butyl-4-hydroxyhydrocinnamide) with hindered amine light stabilizer.
U.S. Pat. No. 4,405,749 seeks to improve the stability of a polyester resin by using 1,3,5-tris-(2-hydroxyethyl)-s-triazine-2,4,6-(1H,3H,5H)trion and an ester of 3,5-di-t-butyl-4-hydroxyhydrocinnamic acid.
Japanese Patent No. 8

REFERENCES:
patent: 4446262 (1984-05-01), Okumura et al.
patent: 5079284 (1992-01-01), Nakane et al.

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