Patent EP0372728A2 successfully refreshed from Google Patents.
EP0372728A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Smoothly removable cover tape for electronic component carrier
Assignee: 3M Co
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Filing: 1989-11-10
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Granted: —
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Expires: 2009-11-10
Abstract
Abstract Cover tape for a compartmentalized carrier for electronic components. A heat-resistant film (e.g., polyester, polycarbonate, nylon, polystyrene, or PVC) is provided with a heat-sealable but smoothly removable adhesive coating that is a blend of SIS (or other non-crosslinking) block copolymer and an adhesion modifier such as a hydrocarbon resin, oil, or wax.
Inventors
- 👤 Janet T. C/O Minnesota Mining And Keller
- 👤 Sharon N. C/O Minnesota Mining And Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 12:07
CPC Classifications
H; H05; H05K; H05K13/00; H05K13/003; C; C09; C09J; C09J153/00; C09J153/02; C09J7/00; C09J7/20; C09J7/22; C09J7/30; C09J7/35
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
A heat-sealable cover tape for use with embossed compartmentalized carrier tapes of the type used to transport surface mountable electronic components, said cover tape comprising in combination: a heat-resistant flexible polymeric film backing coated with a hot melt adhesive that comprises about 25-75 parts of a non-crosslinking synthetic elastomeric block copolymer and correspondingly about 75-25 parts of an adhesion modifier, said cover tape, upon being heat-sealed to a carrier tape to form a composite, resisting separation when the composite is twisted and being smoothly and cleanly removable, even after being aged for two weeks at 60 o C., at a force not in excess of 100 grams.
Claim 2
Dependent Claim
107 words
A heat-sealable cover tape for use with embossed compartmentalized carrier tapes of the type used to transport surface mountable electronic components, said cover tape comprising in combination: a heat-resistant flexible polymeric film backing coated with a hot melt adhesive that comprises about 25-75 parts of a non-crosslinking synthetic elastomeric block copolymer and correspondingly about 75-25 parts of an adhesion modifier, said cover tape, upon being heat-sealed to a carrier tape to form a composite, resisting separation when the composite is twisted and being smoothly and cleanly removable, even after being aged for two weeks at 60 o C., at a force not in excess of 100 grams.
Claim 3
Dependent Claim
20 words
The cover tape of claim 1 wherein the adhesive comprises about 40-60% block copolymer and correspondingly about 60-40% adhesion modifier.
Claim 4
Dependent Claim
31 words
The cover tape of claim 1, wherein the adhesive contains an effective amount of an antioxidant, thereby permitting composites to be exposed to aging at elevated temperatures without being deleteriously affected.
Claim 5
Dependent Claim
21 words
The cover tape of claim 3 whereing the block copolymer is a styrene-isoprene-styrene synthetic rubber or a styrene-ethylene-butylene styrene synthetic rubber.
Claim 6
Dependent Claim
17 words
The cover tape of claim 4 wherein the adhesion modifier is a hydrocarbon resin, oil, or wax.
Claim 7
Dependent Claim
22 words
The cover tape of claim 5 wherein the backing is a polyester-polyethylene composite film, the adhesive being coated over the polyethylene surface.
Claim 8
Dependent Claim
24 words
The cover tape of claim 6 wherein the peel adhesion of a carrier tape-cover tape composite is in the approximate range of 10-70 grams.
References Cited (Backward Citations)
No citation records indexed.
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