Patent US5532293A successfully refreshed from Google Patents.
US5532293A
Expired / Lapsed
US
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Microcapsule-containing cohesive coating
Assignee: WestRock MWV LLC
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Filing: 1994-09-07
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Granted: 1996-07-02
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Expires: 2014-09-07
Abstract
Abstract An adhesive system comprising an activatable, non-tacky cohesive material dispersed in a nonadherent material, said nonadherent material reducing the coefficient of friction of said cohesive material and rendering said cohesive material non-coherent; and a plurality of microcapsules dispersed in said nonadherent material and said cohesive material, said microcapsules encapsulating a solvent for said cohesive and being rupturable upon the application of pressure, wherein upon the application of pressure, the microcapsules rupture and release said solvent and said solvent dissolves said cohesive material such that said cohesive material becomes coherent.
Inventors
- 👤 Robert A. Landis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:15
CPC Classifications
B; B65; B65D; B65D27/00; B65D27/12; B65D27/14; B65D27/16; C; C09; C09J; C09J7/00; C09J7/20; C09J7/21; C09J7/30; C09J7/38
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
89 words
An adhesive system comprising: an activatable, non-tacky cohesive material dispersed in a nonadherent material, said nonadherent material reducing the coefficient of friction of said cohesive material and rendering said cohesive material non-coherent; and a plurality of microcapsules dispersed in said nonadherent material and said cohesive material, said microcapsules encapsulating a solvent for said cohesive and being rupturable upon the application of pressure, wherein upon the application of pressure, the microcapsules rupture and release said solvent and said solvent dissolves said cohesive material such that said cohesive material becomes coherent.
Claim 2
Dependent Claim
89 words
An adhesive system comprising: an activatable, non-tacky cohesive material dispersed in a nonadherent material, said nonadherent material reducing the coefficient of friction of said cohesive material and rendering said cohesive material non-coherent; and a plurality of microcapsules dispersed in said nonadherent material and said cohesive material, said microcapsules encapsulating a solvent for said cohesive and being rupturable upon the application of pressure, wherein upon the application of pressure, the microcapsules rupture and release said solvent and said solvent dissolves said cohesive material such that said cohesive material becomes coherent.
Claim 3
Dependent Claim
13 words
The adhesive system of claim 1 wherein said cohesive material is natural rubber.
Claim 4
Dependent Claim
13 words
The adhesive system of claim 2 wherein said cohesive material is a latex.
Claim 5
Dependent Claim
25 words
The adhesive of claim 3 wherein said cohesive includes a natural or synthetic polymer having a molecular weight greater than about 20,000 to reduce creep.
Claim 6
Dependent Claim
25 words
The adhesive of claim 4 wherein said synthetic polymer material is a thermoplastic resin having a glass transition temperature of greater than about 5° C.
Claim 7
Dependent Claim
13 words
The adhesive of claim 5 wherein said thermoplastic resin is an EVA copolymer.
Claim 8
Dependent Claim
26 words
The adhesive of claim 6 wherein the cohesive comprises a mixture of thermoplastic resin and latex and the ratio of EVA to latex is about 1:2.
Claim 9
Dependent Claim
15 words
The adhesive of claim 2 wherein said nonadherant material is a water-soluble film forming material.
Claim 10
Dependent Claim
13 words
The adhesive of claim 8 wherein said water-soluble film forming material is gelatin.
Claim 11
Dependent Claim
37 words
The adhesive of claim 9 wherein said cohesive material consists essentially of a natural rubber latex, said nonadherant material consists essentially of gelatin, and said solvent is a mixture of an aliphatic hydrocarbon and an alkyl biphenyl.
Claim 12
Dependent Claim
12 words
The adhesive of claim 1 wherein said solvent is non-polar organic solvent.
Claim 13
Dependent Claim
102 words
A tamper-evident envelope having a layer of adhesive thereon, wherein said adhesive provides cohesion between two portions of said envelope, said adhesive comprising: an activatable, non-tacky cohesive material dispersed in a nonadherent material and adhered to a portion of said envelope, said nonadherent material reducing the coefficient of friction of said cohesive material, and rendering said cohesive material noncoherent; and a plurality of pressure-rupturable microcapsules dispersed in said nonadherent material and said cohesive material, said microcapsules encapsulating a solvent for said cohesive, which is released upon rupturing said microcapsules and dissolves said cohesive material such that said cohesive material is rendered coherent.
Claim 14
Dependent Claim
102 words
A tamper-evident envelope having a layer of adhesive thereon, wherein said adhesive provides cohesion between two portions of said envelope, said adhesive comprising: an activatable, non-tacky cohesive material dispersed in a nonadherent material and adhered to a portion of said envelope, said nonadherent material reducing the coefficient of friction of said cohesive material, and rendering said cohesive material noncoherent; and a plurality of pressure-rupturable microcapsules dispersed in said nonadherent material and said cohesive material, said microcapsules encapsulating a solvent for said cohesive, which is released upon rupturing said microcapsules and dissolves said cohesive material such that said cohesive material is rendered coherent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-02 | 2000-01-01 | 2000-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-02 | 2004-01-01 | 2004-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-02 | 2008-01-01 | 2008-07-02 | $7700.00 | Window Closed / Lapsed |