Severable multilayer thermoplastic film
First Claim
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1. A thermoplastic, severable film having a plurality of randomly occurring parallel layers of a brittle thermoplastic polymeric material having a glass transition temperature of greater than 50°
- C., and a ductile polymeric material having at least 100% elongation at break situated one on the other in an array, said array comprising the product of a steam of each of said materials which, independently, has been split into a predetermined number of substream and said substreams subsequently recombined to form said array,wherein no two adjacent layers of said array are of the same material, andwherein each of said layers has sufficient adhesion to said adjacent layers to enable said film to be severed precisely in a straight line.
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Abstract
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.
64 Citations
45 Claims
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1. A thermoplastic, severable film having a plurality of randomly occurring parallel layers of a brittle thermoplastic polymeric material having a glass transition temperature of greater than 50°
- C., and a ductile polymeric material having at least 100% elongation at break situated one on the other in an array, said array comprising the product of a steam of each of said materials which, independently, has been split into a predetermined number of substream and said substreams subsequently recombined to form said array,
wherein no two adjacent layers of said array are of the same material, and wherein each of said layers has sufficient adhesion to said adjacent layers to enable said film to be severed precisely in a straight line. - View Dependent Claims (2, 3, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 40, 41, 43, 44, 45)
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28. A severable film according to claim 1, 4, 5 or 6 having at least 25 layers.
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29. A severable film according to claim 28 having at least 45 layers.
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30. A severable film according to claim 29 having at least 65 layers.
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31. A severable film according to claim 1, 4, 5 or 6 wherein a layer of a first functional material is applied to at least one surface thereof.
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32. A severable film according to claim 31 wherein said first functional material comprises an adhesive.
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33. A severable film according to claim 32 wherein said adhesive comprises a pressure sensitive adhesive.
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34. A severable film according to claim 31 wherein said first functional material comprises an abrasive material.
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35. A severable film according to claim 34 wherein an adhesive is applied to the surface opposite the surface bearing said abrasive material.
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36. An oriented film according to claim 1, 4, 5 or 6.
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37. A biaxially oriented film according to claim 1, 4, 5 or 6.
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40. A severable film according to claim 1, 4, 5 or 6 wherein one of said materials forms an envelope around said film.
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41. A severable film according to claim 40 wherein said ductile material forms said envelope.
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43. A severable film according to claim 1, 4, 5 or 6 wherein said layers comprise only said ductile material and said brittle material and wherein at least one of said materials has been combined with a component which contains a group reactive with said other material.
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44. A severable film according to claim 43 wherein said brittle material contains a component reactive with said ductile material.
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45. A severable film according to claim 44 wherein said component is selected from acrylic acid, methacrylic acid, maleic anhydride, vinyl pyridine and oxazoline-containing materials.
- C., and a ductile polymeric material having at least 100% elongation at break situated one on the other in an array, said array comprising the product of a steam of each of said materials which, independently, has been split into a predetermined number of substream and said substreams subsequently recombined to form said array,
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4. A severable thermoplastic film having a stretch at dispensing of no more than 6.5% said film comprising at least five layers situated one on the other in a parallel array, said layers occurring essentially randomly in said array and being individually selected from a brittle thermoplastic polymeric material having a glass transition temperature of greater than 50°
- C., and a ductile polymeric material having at least 100% elongation at break, wherein no two adjacent layers are of the same material, and
wherein each of said layers has sufficient adhesion to said adjacent layers to enable said film to be severed precisely in a straight line.
- C., and a ductile polymeric material having at least 100% elongation at break, wherein no two adjacent layers are of the same material, and
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5. A severable film having at least five alternating, parallel layers of dissimilar materials, wherein no two adjacent layers are of the same material, and wherein each layer comprises either a brittle thermoplastic polymeric material having a glass transition temperature of greater than 50°
- C., or a ductile polymeric material having at least 100% elongation at break, and wherein said film has a stretch at dispensing of no more than 6.5%, and
wherein each of said layers has sufficient adhesion to said adjacent layers to enable said film to be severed precisely in a straight line.
- C., or a ductile polymeric material having at least 100% elongation at break, and wherein said film has a stretch at dispensing of no more than 6.5%, and
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6. A severable film having at least five layers comprising randomly occurring layers of a brittle thermoplastic polymeric material having a glass transition temperature of greater than 50°
- C., a ductile polymeric material having at least 100% elongation at break and optionally an intermediate material which enhances the adhesion between the brittle and ductile materials, wherein no two adjacent layers are of the same material, said film stretching by no more than 6.5% when wherein each of said layers has sufficient adhesion to said adjacent layers to enable said film to be severed precisely in a straight line.
- View Dependent Claims (26)
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38. A severable film having a plurality of randomly occurring parallel layers of a brittle thermoplastic polymeric material having a glass transition temperature of greater than 50°
- C., and a ductile polymeric material having at least 100% elongation at break situated one on the other in an array, wherein one of said materials forms an envelope around said array.
- View Dependent Claims (39)
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42. A method of making a severable, thermoplastic film containing alternating layers of a ductile polymeric material having at least 100% elongation at break, a brittle thermoplastic polymeric material having a glass transition temperature of greater than 50°
- C., and, optionally, an intermediate material capable of enhancing the adhesion between the brittle and ductile materials comprising the steps of
providing an individual stream of each material in a flowable state, separating each said individual stream into substreams of said materials in said flowable state, the number of substreams being individually predetermined for each stream, combining said substreams to form an array of randomly occurring parallel layers of said materials in intimate contact with adjacent layers of said materials, wherein the outermost of said materials forms an envelope around said film, and cooling said film to a non-flowable state.
- C., and, optionally, an intermediate material capable of enhancing the adhesion between the brittle and ductile materials comprising the steps of
Specification