Adhesive-coated film

Details Adhesive-coated film Adhesive-coated film

1997-04-07

2000-01-18

Davis, Jenna

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428343, 428354, C09J 702

Patent

active

060156066

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to an adhesive film and more particularly to film coated with a microsphere adhesive that easily permits trapped air bubbles to escape.


BACKGROUND OF THE INVENTION

When an adhesive film for decoration according to the prior art is bonded to a substrate article, air is entrapped between the adhesive and the substrate article, and to prevent entrapment, a considerably high level of skill is necessary. Further, a great deal of labor and time are necessary for the bonding work. When the conventional adhesive film for decoration is bonded to the substrate article and is used indoors and outdoors, the bonding strength rises with the passage of time, and it is extremely difficult to peel the adhesive film from the substrate article. Thus, a great deal of labor and time are also necessary.
An adhesive sheet material disclosed in Japanese Examined Patent Publication (Kokoku) No. 44-17040 and a positionable adhesive tape disclosed in Japanese Unexamined Patent Publication (Kokai) No. 3-181578 form recesses in a support or a carrier web, and dispose non-adhesive members or glass beads in the recesses. Because the adhesive does not directly come into contact with the substrate article, these tape and web have slidability and working becomes easier. However, the process step of forming the recesses in the support and the carrier web is necessary. After the film is pressed on the substrate article, the adhesive does not have protuberances any more, and the substrate article and the adhesive do not have point contact any more, either. Accordingly, when air remains on the substrate article at the center of the film, this air cannot be removed. Since surface contact is established when the film is press-bonded to the substrate article, the contact area increases with time and the bonding strength increases, so that re-peel is extremely difficult.
A pressure-sensitive adhesive composition disclosed in Japanese Examined Patent Publication (Kokoku) No. 45-17074 is obtained by mixing light-weight brittle glass beads having a thin wall with a liquid adhesive composition and coating and drying the mixture. The adhesive having protuberances obtained in this way has slidability because the adhesive does not come into direct contact with the substrate article, and working becomes easy. However, after the film is press-bonded on the substrate article, the glass beads are ruptured, and the substrate article and the adhesive do not have the point contact any more. Accordingly, if air remains at the center of the film, this air cannot be removed. Further, when the film is press-bonded to the substrate article, the contact area becomes greater with time and the bonding strength increases, so that re-peel is extremely difficult.
An adhesive tape for packaging disclosed in Japanese Unexamined Utility Model Publication (Kokai) No. 59-763 and an adhesive tape disclosed in Japanese Unexamined Utility Model Publication (Kokai) No. 59-37343 prevent entrapment of air by partial disposition of an adhesive layer. However, these tapes involve the problem in that because the adhesive must be scattered in a dot system or a stripe pattern, a specific coating machine for this purpose is necessary. Another problem is that the film surface gets uneven due to the dots or the stripe pattern which is partially disposed.
An air-permeable adhesive member disclosed in Japanese Unexamined Patent Publication (Kokai) No. 2-45582 has a structure wherein an air-permeable adhesive layer containing hollow beads is disposed on a porous air-permeable substrate, and a large number of microspheres communicating with the pores in the substrate are disposed. According to this conventional art, the substrate is limited because it must be porous, and special equipment is necessary for partially removing an adhesive solution by a gas blow system or an air suction system from the air-permeable substrate side after the coating solution is applied. Another problem is that when an ink for decoration is applied, it closes the pores of th

REFERENCES:
patent: 4735837 (1988-04-01), Miyasaka
patent: 4855170 (1989-08-01), Darvell
patent: 4994322 (1991-02-01), Delgado

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