L,2-Dihydro-6-ethoxy-2,2,4-trimethylquinoline

The principal objection to -PDA antiozonants is their staining characteristics. The lack of suitable alternative antiozonants for light-colored diene mbber articles is one of the outstanding problems in mbber technology. Pew chemical antiozonants outside the class of -PDAs have much commercial importance. One of the few exceptions to this rule is 6-ethoxy-l,2-dihydro-2,2,4-trimethylquinoline [91-53-2] one of the first commercial antiozonants. 

Monohydrochloride, 860 6-Ethoxy-l,2-dihydro-2,2,4-trimethylquinoline, 135, (S3)23 3 -Ethoxy-4-hydroxybenzaldehyde, 496... 

SYNS l,2-DIHYDRO-6-ETHOXY-2,2,4-TRIMETHYL-QUINOLINE l,2-DIHYDRO-2,2,4-TRIMETHYI 6-ETHOXYQUINOLINE EMQ EQ 6-ETHOXY-l,2-DIHYDRO-2,2,4-TRIMETHYLQUINOLINE ETHOXY-QUIN (FCC) ETHOXYQUINE 6-ETHOXY-2,2,4-TRIMETHYDl,2-DIHYDROQUINOUNE NIFLEX NIX-SCALD SANTOFLEX A SANTOFLEX AW SANTOQUIN STOP-SCALD 2,2,4-TRIMETHYL-6-ETHOXY-1.2-DIHYDROQUINOLINE USAFB-24... 

ETHOXY DIGLYCOL see CBROOO 2-ETHOXY DIHYDROPYRAN see EER500 2-ETHOXY-3,4-DIHYDRO-l,2-PYRAN see EER500 2-ETHOXY-3,4-DIHYDRO-2H-PYRAN see EER500 2-ETHOXY-2,3-DIHYDRO-y-PYRAN see EER500 6-ETHOXY-l,2-DIHYDRO-2,2,4-TRIMETHYLQUINOLINE see SAVOOO 1-ETHOXY-3,7-DIMETHYL-2,6-OCTADIENE see GDGIOO... 

Antioxidants. The 1,2-dihydroquinolines have been used in a variety of ways as antioxidants (qv). For example, l,2-dihydro-2,2,4-trimethylquinoline along with its 6-decyl [81045-48-9] and 6-ethoxy [91-53-2] derivatives have been used as antio2onants (qv) and stabilizers (68). A polymer [26780-96-1] of l,2-dihydro-2,2,4-trimethylquinoline is used in resins, copolymers, lubricant oils, and synthetic fibers (69). These same compounds react with aldehydes and the products are useful as food antioxidants (70). A cross-linked polyethylene prepared with peroxides and other monomers in the presence of l,2-dihydro-6-ethoxyquinoline produces polymers with a chemically bonded antioxidant (71). 

Chemical Antiozonants. The first effective chemical antiozonant was a dihydroquinoline type, l,2-dihydro-6-ethoxy-2,2,4-trimethylquinoline (DETQ). However, polymerised quinoline derivatives provide only slight ozone protection, although they are good antioxidants. DETQ provides protection against the action of ozone, hut it is highly staining and discoloring and is lost from rubber compounds because of its volatility. 

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