US4557960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensitive adhesive transfer tape containing organic filaments
Assignee: 3M Co
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Filing: 1983-12-07
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Granted: 1985-12-10
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Expires: 2003-12-07
Abstract
Abstract A pressure-sensitive adhesive transfer tape of the prior art has an adhesive layer containing uniformly dispersed glass monofilaments which randomly cross each other but are predominantly oriented in the lengthwise direction of the tape and generally lie in straight lines. In contrast, the monofilaments of the transfer tape of the present invention are organic and have a randomly disposed, individually arcuate configuration as shown in FIG. 2. Unlike the prior tape, the novel tape can have high adhesion and shear values and yet be dispensed from an ordinary adhesive transfer gun.
Inventors
- 👤 Caroline L. Vernon
- 👤 Earl A. Stanek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:56
CPC Classifications
C; C09; C09J; C09J4/00; C09J7/00; C09J7/30; C09J7/38; C09J7/381; C09J7/385; Y; Y10; Y10T; Y10T428/00; Y10T428/14; Y10T428/1462; Y10T428/28; Y10T428/2809; Y10T428/29; Y10T428/2904
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
127 words
Pressure-sensitive adhesive transfer tape comprising an adhesive layer which (1) is a polymer of 50-100 parts alkyl acrylate having an average of 4-12 carbon atoms in its alkyl group and correspondingly 50-0 parts of copolymerizable monoethylenically-unsaturated monomer and (2) contains organic monofilaments which randomly cross each other and are uniformly dispersed in a free extended state, wherein the improvement comprises: the adhesive contains a photoinitiator and the monofilaments have a randomly disposed, individually arcuate configuration, comprise from 0.1 to 5 percent by volume of the adhesive tape, have an average diameter from 5 to 40 micrometers, and have an average length from 3 to 30 mm, whereby said tape is readily dispensable, said adhesive layer being rubbery and difficult to dispense in the absence of said monofilaments.
Claim 2
Dependent Claim
127 words
Pressure-sensitive adhesive transfer tape comprising an adhesive layer which (1) is a polymer of 50-100 parts alkyl acrylate having an average of 4-12 carbon atoms in its alkyl group and correspondingly 50-0 parts of copolymerizable monoethylenically-unsaturated monomer and (2) contains organic monofilaments which randomly cross each other and are uniformly dispersed in a free extended state, wherein the improvement comprises: the adhesive contains a photoinitiator and the monofilaments have a randomly disposed, individually arcuate configuration, comprise from 0.1 to 5 percent by volume of the adhesive tape, have an average diameter from 5 to 40 micrometers, and have an average length from 3 to 30 mm, whereby said tape is readily dispensable, said adhesive layer being rubbery and difficult to dispense in the absence of said monofilaments.
Claim 3
Dependent Claim
18 words
Pressure-sensitive adhesive tape as defined in claim 1 wherein said adhesive tape is supported by a releasable backing.
Claim 4
Dependent Claim
21 words
Pressure-sensitive adhesive tape as defined in claim 1 wherein the monofilaments have a substantially uniform length from 5 to 10 mm.
Claim 5
Dependent Claim
21 words
Pressure-sensitive adhesive tape as defined in claim 1 wherein the monofilaments have a substantially uniform diameter from 10 to 20 micrometers.
Claim 6
Dependent Claim
23 words
Pressure-sensitive adhesive tape as defined in claim 1 wherein the monofilaments comprise from 0.5 to 1.0 percent by volume of the adhesive layer.
Claim 7
Dependent Claim
13 words
Pressure-sensitive adhesive tape as defined in claim 1 wherein the monofilaments are nylon.
Claim 8
Dependent Claim
127 words
Method of making the pressure-sensitive adhesive transfer tape of claim 1 comprising the steps of (1) providing a solvent-free syrup of alkyl acrylate monomer having a coatable viscosity and containing a photoinitiator, (2) mixing into the syrup organic monofilaments having an average diameter from 5 to 40 micrometers and an average length from 3 to 30 mm and in an amount providing from 0.1 to 5 percent by volume of the syrup, (3) employing a 3-roll reverse coater comprising a casting roll, a metering roll, and a backup roll to coat the mixture onto a releasable backing through an orifice between the casting roll and the metering roll to a thickness of 0.03 to 2 mm, and (4) photopolymerizing the coated syrup to a pressure-sensitive adhesive state.
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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) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |