US5342685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot-melt-coatable adhesives
Assignee: 3M Co
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Filing: 1992-05-18
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Granted: 1994-08-30
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Expires: 2012-05-18
Abstract
Abstract A hot melt coatable pressure-sensitive adhesive is provided showing high levels of adhesion to low surface energy films and nonwovens. The adhesive elastomeric phase comprises from 78 to 98 parts by weight of a diblock A-B type block copolymer with an elastomeric block of 1,3-polybutadiene with 2 to 22 parts by weight of multiblock A-B type block copolymer. The tackifying material comprises 140 parts or less of a solid tackifying resin and a liquid tackifier to provide an adhesive having a composite midblock glass transition temperature of less than -10° C.
Inventors
- 👤 Ramsis Gobran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:15
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/58; A61L15/585; C; C09; C09J; C09J153/00; C09J153/02; C09J7/00; C09J7/30; C09J7/38; C09J7/381; C09J7/387; C08; C08L; C08L2666/00; C08L2666/02; C09J2453/00; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2852; Y10T428/2878; Y10T428/2883
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
181 words
A diaper comprising an outer backsheet layer and an inner liquid-permeable facing or sheet, the outer backsheet layer formed of a low surface energy, thin plastic outer film and/or a nonwoven, the outer backsheet layer or inner facing or sheet having a tape adhered thereto comprising a backing film and an adhesive layer, the adhesive layer comprising 100 parts of an elastomeric phase and a tackifying phase, the adhesive having a CMTg value of less than about -10° C., the elastomeric phase comprised of from about 78 to 98 parts of a diblock A-B type block copolymer portion of which the B block is comprised predominately of 1,3-butadiene, and the A block is comprised predominately or monoalkenyl arene, and about 2 to 22 parts of a multiblock elastomer portion, of the elastomeric phase, comprising an A-B type block copolymer of at least three blocks, the B block comprised of 1,3-butadiene, the A block comprised of monoalkyl arene, the tackifying phase comprised of from 80 to 140 parts of a solid tackifying resin and 5 to 35 parts of a liquid tackifier.
Claim 2
Dependent Claim
181 words
A diaper comprising an outer backsheet layer and an inner liquid-permeable facing or sheet, the outer backsheet layer formed of a low surface energy, thin plastic outer film and/or a nonwoven, the outer backsheet layer or inner facing or sheet having a tape adhered thereto comprising a backing film and an adhesive layer, the adhesive layer comprising 100 parts of an elastomeric phase and a tackifying phase, the adhesive having a CMTg value of less than about -10° C., the elastomeric phase comprised of from about 78 to 98 parts of a diblock A-B type block copolymer portion of which the B block is comprised predominately of 1,3-butadiene, and the A block is comprised predominately or monoalkenyl arene, and about 2 to 22 parts of a multiblock elastomer portion, of the elastomeric phase, comprising an A-B type block copolymer of at least three blocks, the B block comprised of 1,3-butadiene, the A block comprised of monoalkyl arene, the tackifying phase comprised of from 80 to 140 parts of a solid tackifying resin and 5 to 35 parts of a liquid tackifier.
Claim 3
Dependent Claim
47 words
The diaper of claim 1 wherein the adhesive CMTg value is from -25° C. to -10° C., the diblock copolymer portion comprises 80 to 95 parts of the elastomeric phase and the multiblock A-B type block copolymer portion comprises 5 to 20 parts of the elastomeric phase.
Claim 4
Dependent Claim
26 words
The diaper of claim 2 wherein the solid tackifying resin is a hydrocarbon resin or an aliphatic/aromatic hydrocarbon resin at from about 80 to 135 parts.
Claim 5
Dependent Claim
14 words
The diaper of claim 3 wherein the liquid tackifier is a liquid tackifying resin.
Claim 6
Dependent Claim
20 words
The diaper of claim 3 wherein the liquid tackifier is a plasticizing oil at from about 5 to 30 parts.
Claim 7
Dependent Claim
16 words
The diaper of claim 3 wherein the multiblock A-B type block copolymer is a triblock copolymer.
Claim 8
Dependent Claim
32 words
The diaper of claim 2 wherein the multiblock A-B type block copolymer is a linear triblock copolymer and the solid tackifying resin comprises poly-alpha-pinene, a rosin ester or a hydrogenated rosin ester.
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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) | 1997-08-29 | 1998-02-28 | 1998-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-29 | 2002-02-28 | 2002-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-29 | 2006-02-28 | 2006-08-30 | $7700.00 | Window Closed / Lapsed |