EP0343896A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Tape having improved tear strength
Assignee: 3M Co
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Filing: 1989-05-22
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Granted: —
•
Expires: 2009-05-22
Abstract
Abstract The present invention relates to reinforced pressure-sensitive adhesive tapes, and to a method and apparatus for making these tapes. The present invention provides a tape comprising a backing bearing on at least one major surface thereof a plurality of ribs disposed substantially longitudinally thereon, and further bearing on at least one major surface thereof a layer of adhesive. The ribs are joined to the backing such that the contact angle between the ribs and the surface of the backing ranges from about 10° to about 160°. At least 50% of the cross-section of the ribs must project from the rib-bearing surface of the tape. It is preferred that the adhesive be a pressure-sensitive adhesive. The tape of this invention can be prepared by means of coextrusion techniques.
Inventors
- 👤 Ronald P. C/O Minnesota Mining And Leseman
- 👤 Robert L. C/O Minnesota Mining And Gordier
- 👤 Thomas L. C/O Minnesota Mining And Wood
- 👤 Stephen C. C/O Minnesota Mining And Koehn
- 👤 Dart S. C/O Minnesota Mining And Moy
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 07:01
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/20; C09J7/22; C09J7/24; B; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/12; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/305; B29C48/307; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/2457; Y10T428/28; Y10T428/2839; Y10T428/2848
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
78 words
Reinforced tape comprising a backing bearing on at least one major surface thereof a plurality of ribs disposed substantially longitudinally thereon and further bearing on at least one major surface thereof a layer of adhesive, said ribs being joined to said backing so that the contact angle between any of said ribs and backing ranges from about 10° to about 160°, at least 50% of the original cross-section said ribs projecting from the rib-bearing surface of said tape.
Claim 2
Dependent Claim
78 words
Reinforced tape comprising a backing bearing on at least one major surface thereof a plurality of ribs disposed substantially longitudinally thereon and further bearing on at least one major surface thereof a layer of adhesive, said ribs being joined to said backing so that the contact angle between any of said ribs and backing ranges from about 10° to about 160°, at least 50% of the original cross-section said ribs projecting from the rib-bearing surface of said tape.
Claim 3
Dependent Claim
24 words
The tape of claim 1 wherein the contact angle between any of said ribs and said backing ranges from about 10° to about 140°.
Claim 4
Dependent Claim
27 words
The tape of claim 1 wherein the penetration of said ribs into said backing is no more than about 20% of the total mass of said ribs.
Claim 5
Dependent Claim
15 words
The tape of claim 1 wherein the backing is formed from an extrudable polymeric material.
Claim 6
Dependent Claim
15 words
The tape of claim 1 wherein the ribs are formed from an extrudable polymeric material.
Claim 7
Dependent Claim
12 words
The tape of claim 5 wherein the ribs are formed from polypropylene.
Claim 8
Dependent Claim
13 words
The tape of claim 5 wherein the ribs are formed from polyvinyl alcohol.
Claim 9
Dependent Claim
17 words
The tape of claim 1 wherein there are at least 10 ribs per inch width of backing.
Claim 10
Dependent Claim
17 words
The tape of claim 1 wherein there are at least 20 ribs per inch width of backing.
Claim 11
Dependent Claim
17 words
The tape of claim 1 wherein there are at least 30 ribs per inch width of backing.
Claim 12
Dependent Claim
25 words
The tape of claim 1 further including a low adhesion backsize layer on the major surface of the backing opposite the surface bearing the adhesive.
Claim 13
Dependent Claim
12 words
The tape of claim 1 wherein said adhesive is a pressure-sensitive adhesive.
Claim 14
Dependent Claim
16 words
The tape of claim 1 wherein cross direction tear resistance is at least about 3 lbs.
Claim 15
Dependent Claim
14 words
The tape of claim 1 wherein said tape is oriented in the machine direction.
Claim 16
Dependent Claim
10 words
The tape of claim 14 wherein said tape is calendered.
Claim 17
Dependent Claim
113 words
Method of preparing a rib-bearing article comprising the steps of (1) transporting a first molten resin to a first extrusion die inlet, (2) causing said first resin to flow from said first inlet to a first narrow outlet, comprising an elongated slot, (3) transporting a second molten resin to a second extrusion die inlet, (4) causing said second resin to flow from said second inlet to a second outlet comprising a plurality of orifices, (5) causing said first resin to flow from said first outlet, (6) causing said second resin to flow from said second outlet, and (7) causing said first resin to fuse with said second resin to form a rib-bearing article.
Claim 18
Dependent Claim
113 words
Method of preparing a rib-bearing article comprising the steps of (1) transporting a first molten resin to a first extrusion die inlet, (2) causing said first resin to flow from said first inlet to a first narrow outlet, comprising an elongated slot, (3) transporting a second molten resin to a second extrusion die inlet, (4) causing said second resin to flow from said second inlet to a second outlet comprising a plurality of orifices, (5) causing said first resin to flow from said first outlet, (6) causing said second resin to flow from said second outlet, and (7) causing said first resin to fuse with said second resin to form a rib-bearing article.
Claim 19
Dependent Claim
14 words
The method of claim 16 further including the step of solidifying said rib-bearing article.
Claim 20
Dependent Claim
17 words
The method of claim 17 further including the step of orienting said article in the machine direction.
Claim 21
Dependent Claim
24 words
The method of claim 18 further including the step of applying a layer of adhesive over at least one major surface of said article.
Claim 22
Dependent Claim
14 words
The method of claim 18 further including the step of calendering said oriented article.
Claim 23
Dependent Claim
91 words
Method of preparing a rib-bearing article comprising the steps of (1) transporting a first molten resin to an extrusion die inlet, (2) transporting a second molten resin to said extrusion die inlet, (3) causing said first molten resin and said second molten resin to flow from said inlet to an outlet comprising an orifice comprising an elongated slot and a plurality of notches, and (4) causing said first molten resin and said second molten resin to flow from said outlet and to fuse with each other to form a rib-bearing article.
Claim 24
Dependent Claim
91 words
Method of preparing a rib-bearing article comprising the steps of (1) transporting a first molten resin to an extrusion die inlet, (2) transporting a second molten resin to said extrusion die inlet, (3) causing said first molten resin and said second molten resin to flow from said inlet to an outlet comprising an orifice comprising an elongated slot and a plurality of notches, and (4) causing said first molten resin and said second molten resin to flow from said outlet and to fuse with each other to form a rib-bearing article.
Claim 25
Dependent Claim
14 words
The method of claim 21 further including the step of solidifying said rib-bearing article.
Claim 26
Dependent Claim
17 words
The method of claim 22 further including the step of orienting said article in the machine direction.
Claim 27
Dependent Claim
24 words
The method of claim 23 further including the step of applying a layer of adhesive over at least one major surface of said article.
Claim 28
Dependent Claim
14 words
The method of claim 23 further including the step of calendering said oriented article.
References Cited (Backward Citations)
No citation records indexed.
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