Painter's masking tape and its use

Details Painter's masking tape and its use Painter's masking tape and its use

1999-04-20

2001-10-02

Zirker, Daniel (Department: 1771)

Coating processes

Coating remains adhesive or is intended to be made adhesive

Pressure sensitive adhesive

C442S151000, C428S343000, C428S3550BL

Reexamination Certificate

active

06296904

ABSTRACT:

The invention relates to the use of an adhesive film which is etachable by pulling in the direction of the bond plane as a painter's asking tape and to a painter's masking tape of this kind.
Painter's adhesive tapes are known, obtainable commercially, and in widespread use by both professional and home decorators. The majority of them are self-adhesive tapes with a backing of paper, which may have been creped or otherwise pretreated. Problems arise with such tapes especially in the course of their subsequent redetachment and also when they are applied non-linearly, in which case stresses in the material lead to partial lifting of the tape and the ingress of paint, varnish or the like under
Also known, however, are strippable adhesive tapes which can be peeled off again without damage by pulling in the direction of the bond plane. Double-sided adhesive films of this kind are on the market as tesa Power Strips® (stretch-releasable adhesive tapes). Products of this kind are described in U.S. Pat. No. 4,024,312, DE 33 31 016 C2, DE 3714 453 C1, WO 92/11332, U.S. Pat. No. 5,516,581, U.S. Pat. No. 5,672,402, DE 42 22 849 C1, WO 95/06691;DE 44 28 587 C2, DE 44 31 914 A1, WO 97/07172, EP 761,793 A2 and DE 197 08 366. In general, the focus of the products described therein is on double-sided adhesive fixing tapes for bonding two substrates.
However, there have also been proposals to use such strippable adhesive tapes for masking as well. Thus in U.S. Pat. No. 5,516,581 column 2, line 46 et seq. it is stated that, although the major use is in the categories of “mounting” and “joining”, “labeling” and “masking” would also be appropriate; in this context, however, the structure of the product with its highly extensible sheet backing (column 3, line 40 et seq.) is disadvantageous in terms of cost, production, and use, for example, as painter's masking tape.
The object of the invention is to remedy this situation and, in particular, to provide an inexpensive, uncomplicated and practical painter's masking tape which at the same time can be stripped off again without residue or damage after it has been used.
The present invention relates to a masking tape comprising:
a) a self-adhesive composition based on thermoplastic rubber and tackifying resins; and
b) an extensible nonwoven adhered to one side of said self-adhesive composition;
the masking tape capable of being detached from a surface to which it is adhered by pulling on the masking tape in the direction of the plane of the bond formed between the masking tape and said surface.
The self-adhesive composition is based on thermoplastic rubber and tackifying resins, and can be formed as an adhesive film which exhibits high elasticity and low plasticity, which exhibits an adhesion which is lower than its cohesion, which exhibits an adhesiveness which largely disappears when the adhesive film is extended, and which exhibits a ratio of peel force to tear load of at least 1:1.5. The self-adhesive composition may contain one or more antioxidants, UV stabilizers, colorants, fillers and/or auxiliaries.
The self-adhesive composition is covered on one side with a nonwoven, which is, in particular, a polymeric nonwoven. The nonwoven may have a basis weight of 10-40 g/m
2
, in particular a basis weight of 15-25 g/m
2
.
For use, the inventive masking tape can be applied to a surface to be painted to mask said surface. The surface is then painted, and the masking tape thereafter removed by pulling on the masking tape in the direction of the plane of the bond formed between the masking tape and said surface. The inventive masking tape is suitable for non-linear masking, wherein the masking tape is not applied to the surface to be painted in a straight-line.


REFERENCES:
patent: 4988550 (1991-01-01), Keyser et al.
patent: 5227225 (1993-07-01), Mamish
patent: 5246773 (1993-09-01), Mamish
patent: 5464692 (1995-11-01), Huber
patent: 5516581 (1996-05-01), Kreckel et al.
patent: 6042882 (2000-03-01), Deeb et al.
patent: 33 31 016 (1984-10-01), None
patent: 410674 (1991-01-01), None
Abstract of DE 33 31 016. Oct. 11, 1994.

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