Stock material or miscellaneous articles – Layer or component removable to expose adhesive – Halogen containing compound
Patent
1992-09-09
1994-12-13
Robinson, Ellis P.
Stock material or miscellaneous articles
Layer or component removable to expose adhesive
Halogen containing compound
428124, 428194, 428345, 428349, 428354, 428355, 428356, 428447, 604389, 604390, C09J 702
Patent
active
053728653
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The first embodiment of the present invention relates to a double-side pressure-sensitive tape free from the necessity of a release paper, and to a double-side pressure-sensitive tape in which even if pressure-sensitive adhesives are bonded to each other, they can thereafter be easily separated. This tape is suitable for use in, for example, fixing absorbent articles such as paper diapers and napkins.
The second embodiment of the present invention relates to a pressure-sensitive tape for use, for example, as a fastener tape or the like for fixing the front part of a disposable diaper to the back part thereof.
BACKGROUND ART
As a double-side pressure-sensitive tape which does not use a release paper (separator), a tape obtained by coating a support on one side with an acrylic pressure-sensitive adhesive and on the other side with a rubber-based pressure-sensitive adhesive is known so far. However, this has drawbacks that adherends to which this tape is applicable are limited, that the property of separating pressure-sensitive adhesives from each other after laminating is unequivocally determined by the modulus of elasticity or the like of the pressure-sensitive adhesives and cannot be varied, and further that since acrylic pressure-sensitive adhesives, for example, have poor storage stability, they are unusable in articles to be used over a long period of time. Further, acrylic pressure-sensitive adhesives and rubber-based pressure-sensitive adhesives differ considerably from each other in properties such as adhesive force, heat resistance, and solvent resistance, and use of the rubber-based pressure-sensitive adhesive is unsuitable in case of bonding with the pressure-sensitive tape, followed by heat treatment, resin processing, or long-term use.
Also, a tape is known as a double-side pressure-sensitive tape free from the necessity of a release paper, which is obtained by coating a support on one side with a pressure-sensitive adhesive prepared by partially crosslinking an acrylic resin having a carboxyl group in a side chain with an isocyanate and on the other side with a pressure-sensitive adhesive prepared by partially crosslinking an acrylic resin having a hydroxyl group in a side chain with a melamine resin (e.g., Unexamined Published Japanese Patent Application 54-108833). However, this tape has a drawback that since the main components of the pressure-sensitive adhesives are limited to acrylic resins, adherends are limited naturally and adhesion to adherends such as polyolefins is poor. Further, use of this tape in sanitary articles or the like has been not preferable since there is a fear that formalin may be emitted because of the crosslinking with a melamine resin.
The first object of the present invention, which has been attained to solve those problems, is to provide a double-side pressure-sensitive tape which is free from the necessity of use of a release paper and which, even when those tapes are laminated with each other, can be easily separated at the interface between pressure-sensitive adhesive layers, by using a pressure-sensitive adhesive layer having a specific composition on one side thereof.
On the other hand, known as a pressure-sensitive tape for use as a fastener tape for fixing the front part of a disposable diaper to the back part thereof is, as shown, for example, in FIG. 20 and FIG. 21, a pressure-sensitive tape 10 produced by double-folding a tape substrate 11 in a manner such that a near-one-end part 11a and a near-other-end part 11b of the substrate become faced to each other, forming a first pressure-sensitive adhesive layer 12 on an inner surface of the near-one-end part 11a in the tape substrate 11, on the other hand, forming a release layer 13 for the first pressure-sensitive adhesive layer 12 on an inner surface of the near-other-end part 11b in the tape substrate 11, and further forming a second pressure-sensitive adhesive layer 14 on an outer surface of the near-other-end part 11b in the tape substrate 11 (Unexamined Published Japanese Utility Mod
Arakawa Masaaki
Sakashita Teiji
Tanaka Naomitu
Ahmad Nasser
Nitto Denko Corporation
Robinson Ellis P.
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