- Preparation method of phosphite antioxidant 168
-
The invention discloses a preparation method of a phosphite antioxidant 168 and belongs to the technical field of antioxidant preparation. The preparation method is as follows: adding excessive 2,4-di-tert-butylphenol and a catalyst into a reaction kettle, adding phosphorus trichloride, and carrying out a synthetic reaction to generate tri(2,4-di-tert-butyl)phosphite; then, adding an anti-hydrolytic agent, then, carrying out filtration, and evaporating the excessive 2,4-di-tert-butylphenol in filtrate to obtain a crude product of tri(2,4-di-tert-butyl)phosphite; and then, crystallizing the crude product, and carrying out centrifuging, washing and drying to obtain a final finished product. By using the preparation method of the phosphite antioxidant 168, the consumption of raw materials isreduced, a reaction solvent is reduced, the reaction time is shortened, and the generation amount of byproducts is low; and a phosphite antioxidant 168 product prepared by using the preparation methodhas the characteristics of high purity (larger than or equal to 99%, low acid value (smaller than or equal to 0.3 mgKOH/g) and good hydrolysis resistance (PH is larger than or equal to 7).
- -
-
Paragraph 0024-0030
(2019/04/27)
-
- Novel process route of synthesizing antioxidant 168
-
The invention provides an organic synthesis method of an antioxidant 168, namely tris(2,4-di-tert-butylphenyl) phosphite. The method comprises the following steps: taking a mixed solution of methanoland toluene as a solvent, and taking 2,4-di-tert-butylphenol and phosphorus trichloride as reactants. According to the invention, a supported catalyst is used, and the carrier and the active center ofthe catalyst are adjusted, so that the reaction is carried out more thoroughly, the yield and the purity of an finally obtained product are greatly improved, the highest yield can be up to 97.8%, thepurity can be up to 98.9%, and the yield and the purity are both obviously higher than the existing level. In the reaction for preparing the tris(2,4-di-tert-butylphenyl) phosphite provided by the invention, the usage amount of the catalyst is low, the reaction temperature is low, the post-treatment of the obtained product is simple, and the yield of a pilot plant test carried out by using the synthesis method provided by the invention is still up to 90% or above.
- -
-
Paragraph 0038-0040; 0044-0046; 0050-0052; 0056-0058; 0062
(2018/09/26)
-
- SOLID ALKYLARYL PHOSPHITE COMPOSITIONS AND METHODS FOR MANUFACTURING SAME
-
The invention is directed to various alkylaryl phosphite compositions that ideally are suitable for use as secondary antioxidants in polymers. In one aspect, the phosphite composition comprises a tris(dialkylaryl)phosphite in an amount from 20 to 93 weight percent; and at least one of: a bis(dialkylaryl)monoalkylaryl phosphite; a bis(monoalkylaryl)dialkylaryl phosphite; and a tris(monoalkylaryl) phosphite. The inventive phosphite composition is a solid at ambient conditions. The invention also relates to alkylate compositions and processes for forming such alkylate compositions and such phosphite compositions.
- -
-
Page/Page column 36; 37
(2011/02/24)
-
- COUMESTAN-LIKE ANTIOXIDANTS AND UV ABSORBANTS
-
The present invention relates to derivatives of the 1H-pyrano[4,3-b]benzofuran-1-one structure and their nitrogen analogues which possess powerful antioxidant properties combined with a highly effective UV absorbing functionality in one molecule. These compounds are especially useful in cosmetical and dermatological formulations.
- -
-
-
- Hydroxy-substituted N-alkoxy hindered amines and compositions stabilized therewith
-
Hindered amines substituted on the N-atom with an hydroxy-substituted alkoxy moiety are particularly effective in stabilizing organic polymer compositions against the deleterious effects of oxidative, thermal and actinic radiation where the presence of the OH group on the compounds adds important properties not otherwise attainable.
- -
-
-
- Substituted 5-heteroaryl-2-(2-hydroxyphenyl)-2h-benzotriazole UV absorbers, a process for preparation thereof and compositions stabilized therewith
-
Compounds of formula I or II where R is a heteroaryl moiety, such as 3-pyridyl, or T is a heteroaryl moiety, such as thien-2,5-diyl, and E1and E2are independently hydrogen, alkyl, aralkyl and the like, are prepared by reaction of a benzotriazole substituted on the 5-position of the benzo ring by a halogen atom with a heteroarylboronic acid or ester in the presence of a transition-metal catalyst, such as palladium (II) diacetate. The benzotriazole compounds of formula I are particularly efficacious as stabilizers for automotive coatings and candle wax.
- -
-
-
- Method for preparing stearically hindered aryl phosphites
-
A new process is disclosed for the manufacture of hindered aryl phosphites using derivatives of mercaptothiazole or dithiocarbamic acid as catalysts. Ortho-tertiary alkyl aryl phosphites are produced by the reaction of a phosphorus trihalide with an ortho-tertiary alkyl phenolic compound in the presence of the aforementioned catalysts.
- -
-
-