EP0316601A2
Expired / Lapsed
EP
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Pressure-sensitive adhesive closure for disposable diaper
Assignee: 3M Co
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Filing: 1988-10-19
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Granted: —
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Expires: 2008-10-19
Abstract
Abstract A pressure-sensitive adhesive closure for a disposable diaper can exhibit high peel resistance both at low and high speeds while its peelability at high speeds is not excessively shocky when it employs a pressure-sensitive adhesive of a certain rheology and it has, covering the fastening area, a polyolefin layer having microtopographical features as in Figs. 1-6 of the drawing. As seen in Figs. 1-6, suitable microtopographical features are provided by a large number of closely spaced asperities at least two micrometers in height that have a jagged appearance at 500X. A pressure-sensitive adhesive of suitable rheology can be provided by a blend of an AB block copolymer, such as a copolymer of styrene and either isoprene or butadiene, and tackifying resin, preferably a mixture of liquid and solid tackifying resins.
Inventors
- 👤 Theresa L. C/O Minnesota Mining And Carpenter
- 👤 Alan J. C/O Minnesota Mining And Sipinen
- 👤 Stephen W. C/O Minnesota Mining And Bany
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 02:36
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/58; A61L15/585; A61F; A61F13/00; A61F13/15; A61F13/56; A61F13/58; A61F5/00; A61F5/44; B; B32; B32B; B32B7/00; B32B7/04; B32B7/12; B32B7/14; C; C09; C09J; C09J153/00; C09J153/02; C08; C08L; C08L2666/00; C08L2666/02; Y; Y10; Y10T; Y10T428/00; Y10T428/14; Y10T428/1452; Y10T428/24; Y10T428/24355; Y10T428/28; Y10T428/2852; Y10T428/2878; Y10T428/2883; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
161 words
Pressure-sensitive adhesive closure for a disposable garment such as a diaper comprising a pressure-sensitive adhesive fastening tape, the adhesive of which comprises a blend of an AB block copolymer and tackifying resin, and a polyolefin layer which forms the fastening area of the garment, characterized in that the fastening surface of the polyolefin layer has a large number of closely spaced asperities that have a jagged appearance at about 500X and are at least two micrometers in height; A comprises vinylarene, B comprises a polymer of at least one monomer selected from conjugated dienes and lower alkenes, and A comprises from 8 to 50 weight percent of the block copolymer; and the AB copolymer comprises from 20 to 60 weight percent of total AB copolymer plus tackifier and the B phase of the blend has a composite Tg of from 250° to 275°K, said closure affording a Mean Peel Force of at least 175 N/m both at 30 and 1250 cm/min.
Claim 2
Dependent Claim
161 words
Pressure-sensitive adhesive closure for a disposable garment such as a diaper comprising a pressure-sensitive adhesive fastening tape, the adhesive of which comprises a blend of an AB block copolymer and tackifying resin, and a polyolefin layer which forms the fastening area of the garment, characterized in that the fastening surface of the polyolefin layer has a large number of closely spaced asperities that have a jagged appearance at about 500X and are at least two micrometers in height; A comprises vinylarene, B comprises a polymer of at least one monomer selected from conjugated dienes and lower alkenes, and A comprises from 8 to 50 weight percent of the block copolymer; and the AB copolymer comprises from 20 to 60 weight percent of total AB copolymer plus tackifier and the B phase of the blend has a composite Tg of from 250° to 275°K, said closure affording a Mean Peel Force of at least 175 N/m both at 30 and 1250 cm/min.
Claim 3
Dependent Claim
21 words
Pressure-sensitive adhesive closure as defined in claim 1 wherein the jagged-appearing asperities are present over at least one-half the fastening surface.
Claim 4
Dependent Claim
33 words
Pressure-sensitive adhesive closure as defined in claim 1 or 2 wherein the surface of the polyolefin polymer at the fastening area is substantially as shown in any of Figs. 1-6 of the drawing.
Claim 5
Dependent Claim
39 words
Pressure-sensitive adhesive closure as defined in any of claims 1-3 wherein the surface asperities of the polyolefin polymer at the fastening area comprise peaks, and the average distance between adjacent peaks is less than five times their average height.
Claim 6
Dependent Claim
22 words
Pressure-sensitive adhesive closure as defined in claim 4 wherein the average distance between adjacent peaks is approximately the same in every direction.
Claim 7
Dependent Claim
57 words
Pressure-sensitive adhesive closure as defined in any of claims 1-5 wherein the surface of the polyolefin polymer at the fastening area has R a of from 0.5 to 6 µm S m of from 50 to 200 µm L o of from 1.01 to 1.15 S of from 60 to 400/cm as measured by a "Perthometer" profilometer.
Claim 8
Dependent Claim
39 words
Pressure-sensitive adhesive as defined in any of claims 1-6 wherein the AB block copolymer is a styrene-isoprene-styrene triblock copolymer, and characteristics of the pressure sensitive adhesive blend lie between lines 20 and 22 of Fig. 19 of the drawing.
Claim 9
Dependent Claim
21 words
Pressure-sensitive adhesive closure as defined in any of claims 1-7 wherein the tackifying resin includes both liquid and solid tackifying resins.
Claim 10
Dependent Claim
20 words
Pressure-sensitive adhesive closure as defined in any of claims 1-7 wherein the tackifying resin is a single semisolid tackifying resin.
Claim 11
Dependent Claim
16 words
Pressure-sensitive adhesive closure as defined in any of claims 1-9 wherein said polyolefin layer comprises polypropylene.
Claim 12
Dependent Claim
21 words
Pressure-sensitive adhesive closure as defined in claim 10 wherein said polyolefin layer comprises a copolymer of polypropylene and a copolymerizable monomer.
Claim 13
Dependent Claim
14 words
Pressure-sensitive adhesive closure as defined in claim 11 wherein said copolymerizable monomer is ethylene.
Claim 14
Dependent Claim
33 words
Pressure-sensitive adhesive closure as defined in any of claims 1-12 wherein the instantaneous peel force of the pressure-sensitive adhesive fastening tape stays substantially within 20% of the Mean Peel Force as herein defined.
Claim 15
Dependent Claim
30 words
Pressure-sensitive adhesive closure as defined in any of claims 1-13, the pressure-sensitive adhesive fastening tape of which has a Shear Adhesion Value as herein defined of at least 150 minutes.
Claim 16
Dependent Claim
51 words
Pressure-sensitive adhesive closure as defined in any of claims 1-14 wherein the AB copolymer comprises an ABA block copolymer wherein A comprises vinylarene, B is selected from homopolymers of isoprene and butadiene and copolymers of ethylene and butylene, and A comprises from 10 to 40 weight percent of the block copolymer.
Claim 17
Dependent Claim
150 words
Pressure-sensitive adhesive closure for a disposable diaper comprising a pressure-sensitive adhesive fastening tape and a polyolefin polymer covering the fastening area, the pressure-sensitive adhesive of the fastening tape comprising a blend of an ABA block copolymer and tackifier, and characterized in that the surface of the polyolefin polymer at the fastening area has R a of from 0.5 to 6 µm S m of from 50 to 200 µm L o of from 1.01 to 1.15 S of from 60 to 400/cm as measured by a "Perthometer" profilometer; A comprises styrene, B comprises at least one monomer selected from isoprene and butadiene, and A comprises from 8 to 35 weight percent of the block copolymer, and the ABA copolymer comprises from 20 to 60 weight percent of total ABA copolymer plus tackifier and the B or midblock phase of the blend has a composite Tg of from 258° to 267°K.
Claim 18
Dependent Claim
150 words
Pressure-sensitive adhesive closure for a disposable diaper comprising a pressure-sensitive adhesive fastening tape and a polyolefin polymer covering the fastening area, the pressure-sensitive adhesive of the fastening tape comprising a blend of an ABA block copolymer and tackifier, and characterized in that the surface of the polyolefin polymer at the fastening area has R a of from 0.5 to 6 µm S m of from 50 to 200 µm L o of from 1.01 to 1.15 S of from 60 to 400/cm as measured by a "Perthometer" profilometer; A comprises styrene, B comprises at least one monomer selected from isoprene and butadiene, and A comprises from 8 to 35 weight percent of the block copolymer, and the ABA copolymer comprises from 20 to 60 weight percent of total ABA copolymer plus tackifier and the B or midblock phase of the blend has a composite Tg of from 258° to 267°K.
References Cited (Backward Citations)
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