Double-faced pressure-sensitive adhesive tapes

Details Double-faced pressure-sensitive adhesive tapes Double-faced pressure-sensitive adhesive tapes

1999-06-23

2001-08-14

Ahmad, Nasser (Department: 1772)

Stock material or miscellaneous articles

Layer or component removable to expose adhesive

C428S041500, C428S041900, C428S042100, C428S214000, C428S353000, C428S354000, C428S356000, C428S480000, C428S906000

Reexamination Certificate

active

06274213

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to the technical field of adhesive tapes, particularly to adhesive tapes without release liner.
PRIOR ART
Double-faced adhesive tapes have previously been used in various fields such as domestic and constructional applications. Reference
105
in
FIG. 5
represents a prior art double-faced adhesive tape comprising adhesive layers
112
and
113
formed on upper and lower faces of a resin film
111
, respectively.
The adhesive layers
112
,
113
are formed in a given thickness by applying and drying an adhesive containing an elastomer such as an isoprene rubber or styrene-butadiene rubber, or a crosslinking acrylic adhesive, a crosslinking silicone adhesive or the like with various additives.
When this adhesive tape
105
is formed into a roll as shown by
110
in
FIG. 4
, a release liner
114
is applied on the upper adhesive layer
112
to allow the tape to be readily unwound without direct contact between the upper adhesive layer
112
and the lower adhesive layer
113
as shown in
FIG. 5
, which otherwise would be difficult to separate from each other.
During the use of a roll of the double-faced tape
110
, the lower adhesive layer
113
on the outermost ply of the adhesive tape
105
1
may be separated from the release liner
114
on the underlying ply of the adhesive tape
105
2
.
However, the double-faced adhesive tape
105
as described above requires that two adhrends should be bonded by provisionally bonding the lower adhesive layer
113
to one adherend, then stripping off the release liner
114
and bonding the other adherend to the exposed adhesive layer
112
. The release liner
114
is not only cumbersome to strip off but also waste.
An object of the present invention is to provide a double-faced adhesive tape without release liner in order to overcome the above disadvantages of the prior art.
DISCLOSURE OF THE INVENTION
In order to solve the above problems, the present invention provides a double-faced adhesive tape comprising a weakly adhesive layer having a relatively weak adhesive force formed on a surface of a resin film and a strongly adhesive layer having a stronger adhesive force than that of said weakly adhesive layer formed on the opposite surface of said resin film, wherein said weakly adhesive layer is formed on the surface of said resin film having been subjected to a rubbing treatment.
In the double-faced adhesive tape of the present invention, said resin film may consist of a polylactic resin film.
In the double-faced adhesive tape of the present invention, said weakly adhesive layer may be based on a polyisoprene rubber.
The double-faced adhesive tape of the present invention may be in the form of a stack of plies with said weakly adhesive layer and said strongly adhesive layer being in direct contact with each other.
The stack of plies may advantageously be in the form of a roll.
In the double-faced adhesive tape of the present invention characterized as above, the weakly adhesive layer having a relatively weak adhesive force is formed on a surface of the resin film and the strongly adhesive layer having a stronger adhesive force than that of the weakly adhesive layer is formed on the opposite surface of the resin film.
In the double-faced adhesive tape, the weakly adhesive layer is formed on the surface of the resin film after having been subjected to a rubbing treatment. Thus, the adhesive force between the weakly adhesive layer and the resin film is increased so that it becomes stronger than the adhesive force between the weakly adhesive layer and the strongly adhesive layer. Therefore, the double-faced adhesive tape may be formed into a stack of plies with the weakly adhesive layer and the strongly adhesive layer being in direct contact with each other without using a release liner. The stack of plies may be in the form of a roll of a single double-faced adhesive tape.
Polylactic resin films are well-suitable for said resin film because they greatly increase their adhesive force against adhesives once their surface has been subjected to a rubbing treatment, though any resin films that increase their adhesive force by a rubbing treatment may be used in the present invention.
The polyisoprene rubber from which said weakly adhesive layer is formed may be either natural or synthetic. The rubber used for the weakly adhesive layer is not limited to polyisoprene rubbers, but also includes various rubber adhesives such as synthetic isoprene rubbers, nitrile rubbers, SBR rubbers, etc. Isoprene rubbers are readily disposable because of their biodegradability.
The double-faced adhesive tape of the present invention includes a double-faced pressure-sensitive adhesive tape.


REFERENCES:
patent: 2532011 (1950-11-01), Dahlquist
patent: 5766748 (1998-06-01), Ikada
patent: 5798159 (1998-08-01), Callahan

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