N-oxy-benzoic acid

Thermally stable polyesters can be produced on the basis of n-oxy-benzoic acid involving stabilizer (triphenylphosphate) introduced on the last stage. The speed of the weight loss decreases two times, after 3 h of exposure to 500 °C polymer loses 0.87% of mass [43]. 

It was found that the use of 30% liquid-crystal copolyester of n-oxy-benzoic acid/polyethyleneterephthalate makes polymethylmethacrylate 30% more durable and increases the elasticity modulus on 110%, with the reprocessibility being the same. 

Phytochemistry Aboveground parts contained flavonoid glycosides (0.43 %), alkaloids (0.016 %), resins (3.53 %), vitamin C (7.2 mg%), and traces of carotene. The compounds N-oxy-benzoic acid, vaniUic, gentisinic, ferulic acid, N-coumarinic and caffeic acids, as well as 2-methoxy-l,4 naphthoquinone have been isolated from the leaves (Khalmatov 1964). Oil from the seeds contains parinaric acid (Tsevegsuren et al. 1998). 

Highly durable, chemically inert, thermo-stable aromatic polyesters can be produced by interaction of polymers containing links of n-oxy-benzoic acid, aromatic dioxy-compounds, for example of hydroquinone and aromatic dicarboxylic acids [40], Thermo-and chemically resistant polyesters of improved mechanical strength can be obtained by the reaction of -oxybenzoic acid, aromatic dicarboxylic acids, aromatic dioxy-compoimds and diaryl carbonates held in solid phase or in high-boiling solvents [41] at temperature 180 °C and lowered pressure, possibly in the presence of catalysts [42], Some characteristics of aromatic polyesters based on n-oxybenzoic acid are gathered in Table 7.1 [20],... 

Celanese Corp. Vectra Polyesters based on n-oxy-benzoic acid and naphthalene derivatives... 

The structure and propertied of various liquid-crystal copolymers are studied in papers [107-112]. For example, copol5miers based on n-oxy-benzoic acid, polyethyleneterephthalate, hydroquinone and terephthalic acid, are studied in [107] the introduction of the mix hydroquinone/tere-phthalic acid accelerates the process of crystallization and increases the degree of crystallinity of polyesters. 

With the account for the upper-mentioned, we have synthesized polyestersulfones on the basis of oligosulfones and terephthaloyl-bis (n-oxy-benzoic) acid [174, 186, 434] and polyestersulfoneketones on the basis of aromatic oligosulfoneketones, mixes of oligosulfones with oligoketones of various corrstitution and degree of polycondensation and different acidic compormds [211,212, 435]. 

An ethereal soln. of tripiperidinomethane added dropwise to a stirred soln. of o-(a-hydroxycinnamoyl)benzoic acid in N,N-dimethylformamide, and allowed to stand 16 hrs. at room temp. 4-(o-carboxyphenyl)-l-oxo-3-oxy-2-phenyl-5-azo-... 

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