Stock material or miscellaneous articles – Layer or component removable to expose adhesive – Polymer derived only from ethylenically unsaturated monomer
Patent
1994-09-01
1997-08-19
Zirker, Daniel
Stock material or miscellaneous articles
Layer or component removable to expose adhesive
Polymer derived only from ethylenically unsaturated monomer
428343, 428352, 428354, 428447, 428913, B32B 712
Patent
active
056586299
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention described herein pertains generally to release liners which have been silicone-coated on both sides.
BACKGROUND OF THE INVENTION
The liner of pressure-sensitive products can be of different types, based on a film, a paper, or a combination of both. For self-wound tapes, the liner must be silicone coated on both sides.
Film liners can be silicone coated on both sides, and are stable with respect to the ambient air humidity. However, they are expensive and consequently of limited use. Only when the cost of the total construction can justify the price differential between the subsequently described alternatives, can this solution be implemented commercially. Paper liners, generally a glassine (highly calendered) type of paper, can also be easily silicone coated on both sides, are relatively inexpensive, but suffer regarding ambient air humidity characteristics. Composite liners, made out of paper and film, can easily be silicone coated on both sides, but are either not stable to ambient air humidity or are expensive.
Alternative solutions can involve the use of a clay-coated kraft liner, which is widely used for single-side pressure sensitive labels, etc. The main advantages of this type of liner is that it lies flat, possesses good dimensional stability and obtains these properties at a reasonable price. The clay coating provides a smooth surface with good hold out, an important characteristic for applying a thermally or radiation curable silicone coating, by any technique.
In order to use this type of liner for self-wound tapes, it traditionally would have been clay-coated on both sides, to provide enough hold-out thereby allowing silicone coating on both sides without a great deal of saturation of the paper. However, a problem which arises when the same coating is applied to both the front and back sides of this type of liner, is that a "bursting" of the paper is likely to occur during passage of the liner through the drying ovens. The "bursting" is induced by the moisture contained in the paper which cannot come out during the thermal drying/curing of the silicone coating as these clay coatings are relatively impervious to water vapor migration. Moreover, this characteristic does not allow proper remoisturization of the liner after the drying/curing of the silicone, which is an essential step to keep the targeted final product characteristics, particularly good dimensional stability (i.e., the product will lay flat).
Standard one-side clay-coated kraft has also been tested in prior art solutions, but requires a high silicone coating weight, sufficient to completely soak the liner with silicone. This mitigates against the economic attractiveness of the process. Additionally, such a heavy silicone coating weight makes it impossible to properly remoisturize the liner after drying/curing of the silicone.
Thus, as can be seen, prior art solutions to the problem have yet to satisfactorily solve the technical issues facing the manufacture of smooth double silicone-coated liners, which are free from undesirable defects on the surface.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a double silicon-coated liner which is adapted for self-wound tapes, while showing good dimensional stabilily when compared to former glassine-type liners, and at an attractive cost to film liners.
It is another object of this invention to provide a liner with at least one side relatively porous to water vapor migration.
It is still another object of this invention to provide a process for silicone coating a paper on both sides, wherein the silicone coating is smooth, free from undesirable defects on the surface, allows for adequate remoisturization and is economic.
These and other objects of this invention will be evident when viewed in light of the drawings, detailed description, and appended claims.
DETAILED DESCRIPTION OF THE DRAWINGS
The invention may take physical form in certain parts and arrangements of parts, a preferred embodiment of which will be de
REFERENCES:
patent: 4761320 (1988-08-01), Coburn, Jr.
patent: 4867828 (1989-09-01), McIntyre
patent: 4871611 (1989-10-01), LeBel
patent: 5108782 (1992-04-01), Reed
patent: 5154956 (1992-10-01), Fradrich
patent: 5229212 (1993-07-01), Reed
patent: 5230944 (1993-07-01), Beer et al.
patent: 5248535 (1993-09-01), Chang et al.
patent: 5281288 (1994-01-01), Murray et al.
patent: 5298325 (1994-03-01), Culbertson
patent: 5354588 (1994-10-01), Mitchell et al.
Delcuve Christian
Pasti Claude
Siraux Guy
Morgan Adhesives Company
Zirker Daniel
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