Method for preventing emission of fluorescence from polyalkylene

Details Method for preventing emission of fluorescence from polyalkylene Method for preventing emission of fluorescence from polyalkylene

1995-11-06

1997-07-29

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Shaping or treating luminescent material

264129, 26417316, 4273935, 427420, 427421, 427428, 427429, 4274301, C09K 1100

Patent

active

056519265

ABSTRACT:
A method for preventing the emission of fluorescence from polyalkylenenaphthalene-2,6-dicarboxylate, including mixing polyalkylenenaphthalene-2,6-dicarboxylate and at least one compound selected from cyclic imino esters and quinoxalines. The above cyclic imino esters and quinoxalines have an absorption intensity E, defined by the following expression: ##EQU1## wherein A is an absorbance measured in 1,1,2,2-tetrachloroethane at a concentration c (g/100 ml) and an optical path d (cm),
of more than 200 at an ultraviolet wavelength range of 340 to 400 nm. And when a coating layer containing at least one ultraviolet absorber is formed on the surface of a molded article made of the above fluorescence-emission preventive mixture, a synergistic suppression of the emission of fluorescence can be obtained.

REFERENCES:
patent: 3325446 (1967-06-01), Chang et al.
patent: 4353959 (1982-10-01), Olson et al.
patent: 5310857 (1994-05-01), Jones et al.
patent: 5352761 (1994-10-01), Jones et al.
patent: 5391330 (1995-02-01), Jones et al.
Cheung, et al. "Photophysical Processes In Dimethyl-2,6-Naphthalene-dicarboxylate And Poly(Ethylene-2,6-Naphthalenedicarboxylate", Journal of Polymer Science: Polymer Letters Edition, vol. 17, pp. 227-232 (1979).

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