Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1997-11-17
1999-04-06
Le, Hoa T.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
4283159, 4283171, 4283173, 4283175, 4283177, 4283184, 428327, 4272071, 427208, 427226, B32B 516
Patent
active
058915621
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a multi-layer, flexible transfer tape with a backing and an adhesive layer, wherein between the backing and adhesive layer a bonding agent-containing transfer layer is provided, which adheres more strongly to the adhesive layer than to the backing, to a process for the production thereof as well as the use of this transfer tape in rolled-up form in a hand apparatus.
BACKGROUND OF THE INVENTION
The transfer tape described above is indicated in the EP 0 318 804. Its special feature is that the bonding agent containing transfer layer contains 0.5 to 5% by weight of a soluble cellulose derivative as tear-off agent. The bonding agent containing transfer layer of this tape can be applied neatly and with sharp edges to places or areas (also large areas) that have to be covered. It can be used in rolled-up form in a hand apparatus for a simple, quick and uniform application onto the substrate in question, a stringiness of the adhesive layer during the tearing off being largely excluded. With this transfer tape it was found that, if pigments are contained in the transfer layer, during the application onto a substrate by means of a hand apparatus, micro-cracks may occur in the transferred layer which, when writing on the transferred layer, e.g. with ink or a koki-pen, may result in smudged lettering. Occasionally, when the transfer tape is stored for a long time, the adhesive layer becomes more or less "dried out" and displays a loss of tackiness . This causes poor initial adhesion when the transfer tape is used again.
The U.S. Pat. No. 3,413,168 discloses a self-adhesive cover tape, the adhesive layer of which contains in statistic distribution hollow microspheres with a diameter of 40 to 100 .mu.m protruding therefrom. The microspheres permit an accurate positioning of the tape and break when the tape is pressed down. As a result the tape is glued to the substrate. The JP 5814 2944 A describes a solid cover material which contains 20 to 55% hollow micro-capsules that are filled with solvents, resin solutions or liquid resins.
DETAILED DESCRIPTION OF THE INVENTION
It was, therefore, the object of the invention to improve the known flexible transfer tape in such a way that the described problems are addressed and the use characteristics improved.
According to the invention this object is achieved in that a) the bonding agent-containing transfer layer and/or b) the adhesive layer contains fine hollow particles and a water-soluble, solid alcohol.
This means, in other words, that embodiment a) and embodiment b) can in each instance be realised by themselves. However, also a combination of the two embodiments is possible and offers advantages, as will be noted from the following.
For the advantageous production of the transfer tape according to the invention a process is suitable, in particular, with which a pigment-containing plastic dispersion is applied by the usual application technologies onto a flexible backing, the dispersion agent is evaporated, subsequent to which an adhesive containing aqueous dispersion is applied by the usual application technologies onto the formed transfer layer followed by an evaporating of the water, wherein a) the pigment-containing plastic dispersion contains a water-soluble, solid alcohol and fine hollow particles and/or b) the adhesive-containing aqueous dispersion contains a water-soluble solid alcohol and fine hollow particles.
According to the present invention, a water-soluble, solid alcohol must be present in at least one of the two layers according to embodiments a) and b). It must be a solid alcohol which is soluble in water at room temperature. This group of alcohols comprises, in particular, the 4-valent alcohols, such as erythritol, the 5-valent alcohols, such as arabitol, adonitol and xylitol, the 6-valent alcohols such as sorbitol, mannitol and dulcitol, but also alcohols with one or more other functional groups which do not pose problems within the framework of the invention, such as, in particular, glucose and fructose, but also di-sacchan
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Bauersachs Wolfgang
Giersemehl Wolfgang
Rutz Wolfhard
Titze Lothar
Weissmann Karl-Heinz
J. Murphy Glenn E.
Jaeschke Wayne C.
Le Hoa T.
Meder Martin G.
Pritt Produktionsgesellschaft mbH
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