Self developing, photoetching of polyesters by far UV radiation

Details Self developing, photoetching of polyesters by far UV radiation Self developing, photoetching of polyesters by far UV radiation

1982-07-09

1983-11-29

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156654, 156668, 219121LM, 2504921, 427 531, 427 541, B44C 122, C03C 1500, C03C 2506

Patent

active

044179480

ABSTRACT:
A technique is described for photoetching polyesters, such as polyethylene teraphthalate (PET), efficiently, and without causing degradation or heating of the bulk of the PET material. At least about 1000.ANG. of the polyester are removed by application of ultraviolet radiation having wavelengths less than 220 nm. To enhance the process, irradiation can occur in the presence of oxygen or air.

REFERENCES:
patent: 3549733 (1970-12-01), Caddell
patent: 3617702 (1971-11-01), Flournoy
patent: 3626143 (1971-12-01), Fry
patent: 3920951 (1975-11-01), Chovan et al.
patent: 4247496 (1981-01-01), Kawakami et al.
Journal of Applied Polymer Science, vol. 16, pp. 175-189, (1972), Photochemical Degradation of Poly(Ethylene Terephthalate, I, Irradiation Experiments With The Xenon and Carbon Arc by M. Day et al.
Journal of Applied Polymer Science, vol. 16, pp. 191-202, (1972), Photochemical Degradation of Poly(Ethylene Terephthalate), II, Effect of Wavelength and Environment on the Decomposition Process by M. Day.
Journal of Applied Polymer Science, vol. 16, pp. 203-215, (1972), Photochemical Degradation of Poly(Ethylene Terephthalate), III, Determination of Decomposition Products and Reaction Mechanism by M. Day et al.
Journal of Applied Polymer Science, vol. 17, pp. 1895-1907, (1973), Photochemical Degradation of Poly(Ethylene Terephthalate), IV, Surface Changes by P. Blais et al.
Journal of Polymer Science: Part A-1, vol. 5, 481-501, (1967), Photolysis of Poly(Ethylene Terephthalate Late by F. B. Marcotte et al.

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