US5741840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cohesively failing hot melt pressure sensitive adhesive
Assignee: HB Fuller Licensing and Financing Inc
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Filing: 1996-07-03
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Granted: 1998-04-21
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Expires: 2016-07-03
Abstract
Abstract A hot melt pressure sensitive adhesive comprising a) from about 15% to about 30% by weight of a linear styrene-ethylene/butylene-styrene copolymer having a styrene content from about 15% to about 35% by weight and a coupling efficiency of less than about 75%; b) from about 20% to about 50% by weight of a tackifying resin selected from the group consisting of those tackifying resins having a softening point of less than about 100° C.; c) from about 30% to about 50% by weight of a plasticizing oil; and d) up to about 15% of a compatible polymer wherein the total polymer content does not exceed 30% by weight of the adhesive wherein the hot melt pressure sensitive adhesive fails cohesively during use.
Inventors
- 👤 Jeffrey S. Lindquist
- 👤 Lisa L. Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:36
CPC Classifications
C; C09; C09J; C09J153/00; C09J153/02; C09J153/025; C08; C08L; C08L2666/00; C08L2666/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
144 words
A hot melt pressure sensitive adhesive comprising: a) from about 15% to about 30% by weight of the adhesive of a linear styrene-ethylene/butylene-styrene block copolymer having a styrene content from about 15% to about 35% by weight of the block copolymer and a coupling efficiency of less than about 75%; b) from about 20% to about 50% by weight of the adhesive of a tackifying resin selected from the group consisting of those tackifying resins having a softening point of less than about 100° C.; c) from about 30% to about 50% by weight of the adhesive of a plasticizing oil; and d) from about 0% to about 15% by weight of the adhesive of a second compatible polymer wherein the total polymer content does not exceed 30% by weight of the adhesive; wherein the hot melt pressure sensitive adhesive fails cohesively during use.
Claim 2
Dependent Claim
144 words
A hot melt pressure sensitive adhesive comprising: a) from about 15% to about 30% by weight of the adhesive of a linear styrene-ethylene/butylene-styrene block copolymer having a styrene content from about 15% to about 35% by weight of the block copolymer and a coupling efficiency of less than about 75%; b) from about 20% to about 50% by weight of the adhesive of a tackifying resin selected from the group consisting of those tackifying resins having a softening point of less than about 100° C.; c) from about 30% to about 50% by weight of the adhesive of a plasticizing oil; and d) from about 0% to about 15% by weight of the adhesive of a second compatible polymer wherein the total polymer content does not exceed 30% by weight of the adhesive; wherein the hot melt pressure sensitive adhesive fails cohesively during use.
Claim 3
Dependent Claim
43 words
The adhesive of claim 1 made by the process comprising the steps of: a) melting the adhesive components; and b) blending the adhesive components until smooth and homogeneous; wherein the melting and blending of each component may occur in any order of addition.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein a high shear sigma blade mixer is used for melting and blending.
Claim 5
Dependent Claim
17 words
The method of claim 2 wherein an upright or lightening mixer is used for melting and blending.
Claim 6
Dependent Claim
17 words
The adhesive of claim 1 wherein the viscosity is less than about 2,500 cPs at 150° C.
Claim 7
Dependent Claim
20 words
The adhesive of claim 1 wherein the T-peel force as measured on an Instron is less than about 1 kg/cm.
Claim 8
Dependent Claim
26 words
The adhesive of claim 1 wherein the compatible plasticizer is selected from the group consisting of napthenic process oil, paraffinic process oil, polybutene, and liquid elastomers.
Claim 9
Dependent Claim
39 words
The adhesive of claim 1 wherein the tackifier is selected from the group consisting of liquid aromatic hydrocarbons; and vinyl toluene and alpha-methyl styrene and rosins and rosin ester having a softening point of less than about 100° C.
Claim 10
Dependent Claim
31 words
The adhesive of claim 1 wherein the second compatible polymer is selected from the group consisting of homopolymers, copolymers and terpolymers of ethylene and propylene, rubbery block copolymers and mixtures thereof.
Claim 11
Dependent Claim
27 words
The adhesive of claim 9 wherein the second compatible polymer is selected from the group consisting of ethylene n-butyl acrylate, ethylene methyl acrylate and vinyl acetate copolymers.
Claim 12
Dependent Claim
131 words
The hot melt pressure sensitive adhesive of claim 1 comprising from about 15% to about 25% by weight of the adhesive of a styrene-ethylene/butylene-styrene block copolymer having a styrene content from about 15% to about 35% by weight and a coupling efficiency of less than about 75%, from about 30% to about 40% by weight of the adhesive of a tackifying resin selected from the group consisting of vinyl toluene and alpha-methylstyrene having a softening point of less than about 75° C., from about 35% to about 45% by weight of the adhesive of a plasticizing oil and from about 5% to about 15% by weight of the adhesive of a compatible polymer selected from the group consisting of ethylene n-butyl acrylate, ethylene methyl acrylate, ethylene vinyl acetate and mixtures thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-04-20 | 2001-10-20 | 2002-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-20 | 2005-10-20 | 2006-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-20 | 2009-10-20 | 2010-04-21 | $7700.00 | Window Closed / Lapsed |