Aromatic polymer molded article with modified surface condition

Details Aromatic polymer molded article with modified surface condition Aromatic polymer molded article with modified surface condition

1991-01-07

1992-12-29

Powell, William A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

156643, 156654, 156668, 21912169, 428212, B44C 122, B29C 3700

Patent

active

051750430

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to an aromatic polymer molded article with modified surface condition and a process for producing the same. More particularly, the present invention relates to the modification of the surface condition, particularly the color, adhesion, lubricity, drawability, etc. of the surface of an aromatic polymer molded article by the irradiation of the molded article with an ultraviolet laser beam under particular conditions.


BACKGROUND ART

As the technique for the modification of the surface condition of a polymer molded article, particularly a polymer film, there have been proposed many methods employing chemical or physical means. In particular, the use of a film as a recording material is rapidly growing recently, and the surface modification of such a film is a requisite and essential technique.
Meanwhile, the use of a high output ultraviolet laser such as excimer laser has recently been proposed as a means for the modification of a polymer molded article. Description is made below on typical literatures describing the use of such an ultraviolet laser.
(1) "Laser Research", Vol. 8, No. 6, 941 (1980):
This treatise entitled "Photoetching of PMMA by Excimer Laser" by Yoshiyuki Kawamura et al. describes the effect of the application of a KrF laser beam to a polymethyl methacrylate (PMMA) under different power densities and different fluences (energy densities), on the etching depth of the PMMA.
(2) Specification of U.S. Pat No. 4,247,496:
This patent describes a method for modifying the surface of a polypropylene film or a polyethylene terephthalate film by drawing the film after or simultaneously with the application of an ultraviolet light using an ultraviolet lamp. The patent describes that by a combination of the ultraviolet light application and the drawing, the film is improved in slipperiness, loses gloss, is improved in hygroscopicity and oil absorbability, and acquires drawability.
Therefore, the patent discloses a method for modifying the surface of a polypropylene film, a polyethylene terephthalate film or the like by a combination of drawing and ultraviolet light application under the above mentioned condition but makes no disclosure as to the method for modifying the surface of a film by ultraviolet light application alone.
(3) Appl. Phys. Lett. 43 (8) 717 (1983):
This treatise entitled "Direct etching of polymeric materials using a XeCl laser" by J. E. Andrew et al. describes that when a polyethylene terephthalate film is irradiated with a XeCl laser beam, the irradiated portion of the film is decomposed and etched. The treatise also describes that a polyimide and a photoresist are etched as well.
(4) IBMT Technical Disclosure Bulletin Vol. 26 No. 63049 (1983):
This treatise entitled "Archival Storage with UV Lasers" by S. E. Blum et al. describes that when a polymer is irradiated with a laser having a wavelength of 200 nm or less, the irradiated portions of the polymer momentarily cause ablation effectively and that the utilization of this ablative feature enables high density information recording in polymer material at a low fluence (energy density).
In this method, however, when a polymer material is irradiated with a laser at a fluence close to the threshold in order to cause ablation and enable information recording therein, the difference in reflectance between the irradiated and non-irradiated portions of the polymer material is not striking in spite of the occurrence of ablation. The enlargement of difference in reflectance requires the use of a laser beam having a higher energy density and a short wavelength of 200 nm or less. Thus, the above method has drawbacks.
(5) Laser Processing and Diagnostics, Proceedings of an International Conference, University of Linz, Austria, Jul. 15-19, 1984, pp. 343-353:
In this treatise entitled "Ultraviolet Laser Ablation of Organic Polymer Films", R. Srinivasan describes that when films of polymers such as polyethylene terephthalate, polyimide, polymethyl methacrylate and the like were irradiated with seve

REFERENCES:
patent: 4414059 (1983-11-01), Blum et al.
patent: 4417948 (1983-11-01), Mayne-Banton et al.
patent: 4568632 (1986-02-01), Blum et al.

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