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Severable multilayer thermoplastic film
| Details |
Inventors: Bland, Ralph H.; Peper, William A.; Stambaugh, Bruce D.;
Assignee: Minnesota Mining and Manufacturing Company (St. Paul, MN)
Primary Examiner: Buffalow; Edith
Assistant Examiner:
Attorney, Agent or Firm: Sell; Donald M., Kirn; Walter N., Lilly; James V.
A dispensable multilayer film having alternating layers of a ductile material, a brittle material, and optionally an intermediate layer. The film has excellent strength in its longitudinal and transverse directions but can be transversely cut by forces of less than 9 Newtons on the cutters of commercially available table top tape dispensers. At least one surface of the sheet material can be coated with a functional material. |
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DETAILED DESCRIPTION The film of the invention comprises interdigitated layers of at least one ductile material, at least one brittle material and, optionally at least one intermediate material.
The exact order of the individual layers is not critical to the invention provided that no two adjacent layers are of the same material and provided further that at least one layer of brittle material and at least one layer of ductile material is present.
Examples of some film structures within the scope of the invention include B(DB).
sub.
x D(BD).
sub.
x D(IBID).
sub.
y B(IDIB).
sub.
y wherein B is the brittle material, D is the ductile material, I is an intermediate material (discussed in more detail below), x is a whole number of at least 2 (preferably at least 4) and y is a whole number of at least 1 (preferably at least 2).
Other arrangements of the various layers are also possible in which the recurrence of the layers is essentially random.
Moreover, the top and bottom outer layers need not be of the same material.
The overall construction of the film may be varied over wide limits.
Preferably, the outermost layers of the film are made up of the material having the lowest melt viscosity.
This provides that the outer layers of the film will be free from flaws or aberrations caused by, for example, dimples and puckers.
A film of the invention having the structure D(IBID).
sub.
y, where y is 2 is shown in FIG.
1.
The film, generally designated by the reference numeral 10, has 9 layers, and comprises alternating layers of ductile material 11, intermediate material 12 and brittle material 13.
The outside layers comprise the ductile material 11.
However, the structure of FIG.
1 could be such that either the brittle material 13 or the intermediate material 12 comprised the outside layers.
As many layers as desired may be employed in the film.
Preferably the film comprises at least 25 layers and more preferably at least 45 layers.
Even more layers may be employed if desired.
The exact number of layers, the thickness of each and the resulting thickness of the film may be varied over wide limits within the scope of the invention
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Nonmetallic Processes 
