US4880683A
Expired / Lapsed
US
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Hot-tackifying adhesive tape
Assignee: 3M Co
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Filing: 1988-05-11
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Granted: 1989-11-14
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Expires: 2008-05-11
Abstract
Abstract Hot-tackifying adhesive tape, the adhesive layer of which is an acrylic polymer which is nontacky or poorly tacky at ordinary room temperature, but at any temperature over a wide range of elevated temperatures, it becomes tacky and adheres upon contact to clean substrates without the application of significant pressure. Good bonds are immediately formed at a tackifying temperature without the necessity of crosslinking or other chemical reactions.
Inventors
- 👤 Robert H. Stow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:06
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/30; C09J7/35; C09J7/10; H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/321; H05K3/36; H05K3/361; Y; Y10; Y10S; Y10S428/00; Y10S428/906; Y10S428/913; Y10S428/914; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24843; Y10T428/24917; Y10T428/24942; Y10T428/2495; Y10T428/24959; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2839; Y10T428/2848; Y10T428/2852; Y10T428/2878; Y10T428/2887; Y10T428/2891; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T442/00; Y10T442/20; Y10T442/2738; Y10T442/2746
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
147 words
Heat-activatable substantially non-thermosettable, substantially non-crosslinkable adhesive tape that can be wound upon itself in roll form for convenience in storage and use and comprises a heat-resistant flexible backing and an adhesive layer which is nontacky or poorly tacky at 20° C., said adhesive layer comprises an acrylic polymer of acrylic ester monomer and is free of a reactive hot-melt resin, wherein the improvement comprises: (1) said acrylic ester monomer provides at least 50 mol percent of the acrylic polymer of said adhesive layer, (2) said acrylic polymer has a Tg or a weightaveraged Tg of from -10° C. to 80° C., and (3) said adhesive layer has a Shear value of at least 25 minutes at 65° C., said adhesive layer adheres well to a clean substrate upon contact when heated to a temperature about 50° C. above the Tg or weight-averaged Tg of said acrylic polymer.
Claim 2
Dependent Claim
147 words
Heat-activatable substantially non-thermosettable, substantially non-crosslinkable adhesive tape that can be wound upon itself in roll form for convenience in storage and use and comprises a heat-resistant flexible backing and an adhesive layer which is nontacky or poorly tacky at 20° C., said adhesive layer comprises an acrylic polymer of acrylic ester monomer and is free of a reactive hot-melt resin, wherein the improvement comprises: (1) said acrylic ester monomer provides at least 50 mol percent of the acrylic polymer of said adhesive layer, (2) said acrylic polymer has a Tg or a weightaveraged Tg of from -10° C. to 80° C., and (3) said adhesive layer has a Shear value of at least 25 minutes at 65° C., said adhesive layer adheres well to a clean substrate upon contact when heated to a temperature about 50° C. above the Tg or weight-averaged Tg of said acrylic polymer.
Claim 3
Dependent Claim
52 words
Heat-activatable adhesive tape as defined in claim 1 wherein said adhesive layer comprises an acrylic copolymer of monomers, up to 50 mol % of which is at least one copolymerizable polar monomer selected from acrylic acid, methacrylic acid, itaconic acid, maleic acid, maleic anhydride, amides of said acids, acrylonitrile, methacrylonitrile, and N-vinyl-2-pyrrolidone.
Claim 4
Dependent Claim
28 words
Heat-activatable adhesive tape as defined in claims 1 or 2 wherein the adhesive is filled with electrically-conductive particles comprising 0.1 to 40 volume percent of the adhesive layer.
Claim 5
Dependent Claim
16 words
Heat-activatable adhesive tape as defined in claim 3 wherein said backing is an electrically-conductive metal foil.
Claim 6
Dependent Claim
34 words
Heat-activatable adhesive tape as defined in claim 3 wherein said backing is a plastic film, and a plurality of narrow, parallel electrically-conductive stripes overlay the plastic film and underlay and contact said adhesive layer.
Claim 7
Dependent Claim
48 words
Heat-activatable adhesive tape as defined in claim 5 wherein said adhesive layer is in stripes overlying each electrically-conductive stripe, and a second unfilled heat-activatable adhesive layer covers the adhesive stripes and the spaces therebetween, the electrically-conductive particles having thicknesses approximating the total thickness of the two adhesive layers.
Claim 8
Dependent Claim
67 words
Heat-activatable adhesive tape as defined in claims 1 or 2 wherein said acrylic ester monomer is selected from alkyl acrylates having 1-8 carbon atoms in their alkyl groups, alkyl methacrylates having 1-8 carbon atoms in their alkyl groups, bornyl acrylates, bornyl methacrylates, 2-phenoxythyl acrylate, 2-phenoxyethyl methacrylate, the mono- and di-methyl and ethyl esters of itaconic acid, and the mono- and di-methyl and ethyl esters of maleic acid.
Claim 9
Dependent Claim
27 words
Heat-activatable adhesive tape as defined in claims 1 or 2 wherein styrene, vinyl acetate and vinyl chloride comprise up to 5 mol % of the total monomers.
Claim 10
Dependent Claim
32 words
Heat-activatable adhesive tape as defined in claims 1 or 2 wherein said backing is a plastic film and there is an adhesion-promoting primer layer between the adhesive layer and the plastic film.
Claim 11
Dependent Claim
18 words
Heat-activatable adhesive tape as defined in claim 9 wherein the plastic film is heat-shrinkable in the lengthwise direction.
Claim 12
Dependent Claim
46 words
Heat-activatable adhesive tape as defined in claims 1 or 2 wherein said backing is an electrically-conductive metal foil, the adhesive layer is in contact with one face of the metal foil, and there is a low-adhesion backside coating on the other face of the metal foil.
Claim 13
Dependent Claim
29 words
Heat-activatable adhesive tape as defined in claims 1 or 2 wherein said backing is a conductive metal foil and a carrier web having low-adhesion surfaces protects the adhesive layer.
Claim 14
Dependent Claim
35 words
Heat-activatable adhesive tape as defined in claim 12 wherein the foil extends in a pattern of lines and/or dots to the surface of the adhesive layer which becomes exposed upon removal of the carrier web.
Claim 15
Dependent Claim
31 words
Heat-activatable adhesive tape as defined in claims 1 or 2 wherein said backing is a fibrous web, the adhesive is mechanically interlocked with the fibers at one face of the backing.
Claim 16
Dependent Claim
15 words
Heat-activatable adhesive tape as defined in claim 14 wherein the backing comprises woven glass fibers.
Claim 17
Dependent Claim
17 words
Heat-activatable adhesive tape as defined in claim 14 wherein the backing comprises a web of nonwoven fibers.
Claim 18
Dependent Claim
27 words
Heat-activatable adhesive tape as defined in claims 1 or 2 wherein said backing has low-adhesion surfaces so that the adhesive layer can be removed from the backing.
Claim 19
Dependent Claim
26 words
Heat-activatable adhesive tape as defined in claim 17 wherein the adhesive is filled with electricallyconductive particles comprising 0.1 to 40 volume percent of the adhesive layer.
Claim 20
Dependent Claim
21 words
Heat-activatable adhesive tape as defined in claims 1 or 2 wherein said adhesive layer consists of spaced stripes of said polymer.
Claim 21
Dependent Claim
42 words
Heat-activatable adhesive tape as defined in claim 19 wherein said backing is a plastic film, there is an electrically-conductive stripe underlying each adhesive stripe, and the adhesive is filled with electrically-conductive particles comprising 0.1 to 40 volume percent of the adhesive layer.
Claim 22
Dependent Claim
23 words
Heat-activatable adhesive tape as defined in claim 19 wherein the spaces between said spaced stripes are filled with stripes of a pressure-sensitive adhesive.
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) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |