Patent EP0257984A2 successfully refreshed from Google Patents.
EP0257984A2
Expired / Lapsed
EP
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Pressure-Sensitive tape construction incorporating resilient polymeric microspheres
Assignee: 3M Co
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Filing: 1987-08-20
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Granted: —
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Expires: 2007-08-20
Abstract
Abstract Tape products for diverse end uses are obtained by applying to a sheet backing a layer of normally tacky and pressure-sensitive adhesive (PSA) containing and completely surrounding resilient non-tacky hollow thermoplastic polymeric microspheres. When the PSA is permanently bonded to the backing and the exposed surface has an irregular contour, a removable and repositionable product results. When the PSA forms a continuous matrix that is strippably bonded to the backing and is 1 mm or more thick, the resultant product is a foamlike transfer tape or foam tape. Depending on the product, the PSA can contain from about 1/5 to about 2/3% of the microspheres by volume.
Inventors
- 👤 Wayne K Minnesota Mining And Darvell
- 👤 Patricia R Minnesota Mining And Konsti
- 👤 Jurgen Minnesota Mining And Klingen
- 👤 Karl W Minnesota Mining And Kreckel
- 👤 Mark D. Purgett
- 👤 Margaret M. Sheridan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 16:47
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/30; C09J7/38; C09J7/20; C09J7/203; B; B05; B05B; B05B12/00; B05B12/16; B05B12/20; B05B12/24; C09J2301/00; C09J2301/40; C09J2301/412
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
95 words
Pressure-sensitive adhesive-coated sheet material comprising in combination a sheet backing bearing on at least one surface a layer of normally tacky and pressure-sensitive adhesive on the order of at least 20 micrometers thick, said layer containing from about 1/5 to about 2/3% by volume of resilient non-tacky hollow thermoplastic polymeric spheres having a diameter in the approximate range of 10-125 micrometers, substantially all of said spheres having an actual density on the order of 0.01-0.04 g/cc and a shell thickness on the order of 0.02 micrometers and being substantially completely surrounded by the pressure-sensitive adhesive.
Claim 2
Dependent Claim
95 words
Pressure-sensitive adhesive-coated sheet material comprising in combination a sheet backing bearing on at least one surface a layer of normally tacky and pressure-sensitive adhesive on the order of at least 20 micrometers thick, said layer containing from about 1/5 to about 2/3% by volume of resilient non-tacky hollow thermoplastic polymeric spheres having a diameter in the approximate range of 10-125 micrometers, substantially all of said spheres having an actual density on the order of 0.01-0.04 g/cc and a shell thickness on the order of 0.02 micrometers and being substantially completely surrounded by the pressure-sensitive adhesive.
Claim 3
Dependent Claim
23 words
A sheet material of claim 1 wherein at least about 2/3 of said spheres have a diameter in the range of 30-70 micrometers.
Claim 4
Dependent Claim
23 words
A sheet material according to claim 2 wherein the layer of normally tacky and pressure-sensitive is on the order of 20-4000 micrometers thick.
Claim 5
Dependent Claim
23 words
A sheet material according to any one of claims 1 to 3 wherein the hollow polymeric spheres are formed of vinylidene chloride-acrylonitrile copolymer.
Claim 6
Dependent Claim
58 words
A sheet material according to claims 2 and 4 wherein the adhesive layer contains 1/5 to 1/2 polymeric spheres on a volume basis and is capable of substantially complete recovery after being subjected to a temporary compressive pressure of 15 kPa, said adhesive maintaining good adhesion to substrate even when subjected to mechanical shock at extremely low temperatures.
Claim 7
Dependent Claim
22 words
A sheet material according to any one of claims 1 to 5 wherein the adhesive layer is permanently bonded to the backing.
Claim 8
Dependent Claim
128 words
The sheet material of claim 6 wherein the thickness of the adhesive layer is on the order of 40-80 micrometers and contains at least 50% of the hollow polymeric spheres on a volume basis, said adhesive layer being capable of substantially complete recovery after being subjected to a temporary compressive pressure of 15 kPa, and the exposed surface of the adhesive layer having an irregular contour caused by the presence of the hollow polymeric spheres, whereby said sheet material can be repeatedly adhered to paper substrate and removed without tearing the paper as compared to a sheet of material identical except that the exposed surface of the adhesive is substantially planar, which comparable sheet cannot be removed from paper substrates, after being applied thereto, without tearing the paper.
Claim 9
Dependent Claim
22 words
A sheet material according to any one of claims 1 to 5 wherein the adhesive layer is strippably bonded to the backing.
Claim 10
Dependent Claim
78 words
A sheet material according to claim 8 wherein the exposed surface of the adhesive layer has an irregular contour caused by the presence of the hollow polymeric spheres, the surface of the adhesive layer in contact with the sheet backing being smooth and uniform, whereby said sheet material can be removed from the backing to provide a transfer tape having lower adhesive properties at the initially exposed surface than at the surface initially in contact with the backing.
Claim 11
Dependent Claim
50 words
A sheet material according to either of claims 8 and 9 wherein the adhesive layer is on the order of one millimeter thick and one surface thereof is strippably bonded to a smooth-surfaced backing, yielding a foam tape especially suited for mounting applications that will be exposed to low temperatures.
Claim 12
Dependent Claim
30 words
A sheet material according to any one of claims 8 to 10 wherein the adhesive layer is on the order of 3-4 millimeters thick and is especially adapted to glazing.
Claim 13
Dependent Claim
22 words
A sheet material according to any one of claims 8 to 11 wherein glass microspheres are also present in the adhesive layer.
Claim 14
Dependent Claim
22 words
A sheet material according to any one of claims 8 to 12 wherein gas-filled voids are also present in the adhesive layer.
Claim 15
Dependent Claim
30 words
A sheet material according to any one of claims 1 to 13 wherein the pressure-sensitive adhesive is a copolymer of isooctyl acrylate and at least one other monoethylenically unsaturated monomer
Claim 16
Dependent Claim
14 words
A sheet material according to claim 14 wherein the other monomer is acrylic acid.
Claim 17
Dependent Claim
13 words
A sheet material according to claim 14 wherein the other monomer is acrylamide.
Claim 18
Dependent Claim
21 words
A sheet material according to any one of claims 14 to 16 wherein one of the other monomers is N-vinyl pyrrolidone.
Claim 19
Dependent Claim
20 words
A sheet material according to claim 14 wherein the adhesive is an isooctylacrylate:acrylic acid:macromer terpolymer, the macromer being methacrylate-capped polystyrene.
Claim 20
Dependent Claim
18 words
A sheet material according to any one of claims 1 to 18 wherein the adhesive contains UV initiator.
Claim 21
Dependent Claim
18 words
A sheet material according to any one of claims 1 to 19 wherein a tackifier is also included.
Claim 22
Dependent Claim
20 words
A sheet material according to any one of claims 1 to 13 wherein the pressure-sensitive adhesive is a rubber-resin composition.
Claim 23
Dependent Claim
24 words
A sheet material according to any one of claims 1 to 21 wherein the adhesive layer contains at least 1/2 hollow spheres by volume.
Claim 24
Dependent Claim
35 words
A sheet material according to any one of claims 1 to 22 wherein a layer of essentially void-free normally tacky and pressure-sensitive adhesive is laminated to at least one face of the microsphere-filled adhesive layer.
Claim 25
Dependent Claim
30 words
A sheet material according to any one of claims 1 to 23 wherein a layer of normally tacky and pressure-sensitive adhesive is adhered to the opposite surface of the backing.
References Cited (Backward Citations)
No citation records indexed.
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