US4358494A
Expired / Lapsed
US
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Process for the preparation of paper-backed adhesive tapes of the pressure-sensitive type
Assignee: Lintec Corp
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Filing: 1979-12-18
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Granted: 1982-11-09
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Expires: 1999-12-18
Abstract
Abstract A widthwise-stretched film is lap-sealed on one side of a backing paper, and polyethylene is extruded and coated on the surface of said film to form a release layer thereon. A pressure-sensitive adhesive composed mainly of polyacrylic ester is then coated on the other side of the backing paper. In this manner, a paper-backed adhesive tape of the pressure-sensitive type is prepared.
Inventors
- 👤 Saburo Akimoto
- 👤 Sachio Maruchi
- 👤 Masahiro Fukaya
- 👤 Tomishi Shibano
- 👤 Ippei Chimura
- 👤 Hiroshi Asakura
- 👤 Keisuke Kitazume
- 👤 Shiro Fuse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:31
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/20; C09J7/29; B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B32B7/00; B32B7/04; B32B7/12; B32B2310/00; B32B2310/14; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; B32B2405/00; C09J2400/00; C09J2400/20; C09J2400/28; C09J2400/283; Y; Y10; Y10S; Y10S428/00; Y10S428/906; Y10T; Y10T428/00; Y10T428/14; Y10T428/1452; Y10T428/24; Y10T428/24942; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/27; Y10T428/273; Y10T428/277; Y10T428/28; Y10T428/2809; Y10T428/2839; Y10T428/2848; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
57 words
A paper-backed adhesive tape of the pressure-sensitive type comprising a backing paper, a widthwise stretched film lap-sealed on one side of said backing paper through an adhesive layer, a release layer obtained by coating polyethylene on the surface of said film by extrusion, and a pressure-sensitive adhesive layer laminated on the other side of said backing paper.
Claim 2
Dependent Claim
57 words
A paper-backed adhesive tape of the pressure-sensitive type comprising a backing paper, a widthwise stretched film lap-sealed on one side of said backing paper through an adhesive layer, a release layer obtained by coating polyethylene on the surface of said film by extrusion, and a pressure-sensitive adhesive layer laminated on the other side of said backing paper.
Claim 3
Dependent Claim
22 words
The tape as claimed in claim 1, in which said backing paper has a delamination strength of 85 to 170 g/15 mm.
Claim 4
Dependent Claim
56 words
The tape as claimed in claim 1, in which said widthwise stretched film consists of high-density polyethylene film having a density of at least 0.94 g/cm 3 and stretched more than six times as its original width without being positively oriented in the lengthwise direction so as to have a thickness of 0.01 to 0.05 mm.
Claim 5
Dependent Claim
43 words
The tape as claimed in claim 1, in which said release layer consists of a low-density polyethylene having a density of at most 0.93 g/cm 3 applied at a resin temperature of 220° to 290° C. prevailing at the outlets of die lips.
Claim 6
Dependent Claim
31 words
The tape as claimed in claim 1, in which the amount of said pressure-sensitive adhesive coated is so adjusted as to provide an adhesion strength of 500 to 3500 g/20 mm.
Claim 7
Dependent Claim
25 words
The tape as claimed in claim 1, wherein a peel strength between said release layer and said adhesive layer is at most 150 g/20 mm.
Claim 8
Dependent Claim
63 words
A process for the preparation of paper-backed adhesive tapes of the pressure-sensitive type comprising the steps of lap-sealing a widthwise stretched film on one side of a backing paper, extruding and coating polyethylene on the surface of said film to form a release layer thereon and coating a pressure-sensitive adhesive composed mainly of polyacrylic ester on the other side of the backing paper.
Claim 9
Dependent Claim
63 words
A process for the preparation of paper-backed adhesive tapes of the pressure-sensitive type comprising the steps of lap-sealing a widthwise stretched film on one side of a backing paper, extruding and coating polyethylene on the surface of said film to form a release layer thereon and coating a pressure-sensitive adhesive composed mainly of polyacrylic ester on the other side of the backing paper.
Claim 10
Dependent Claim
21 words
A process as claimed in claim 7, wherein said backing paper has a delamination strength of 85 to 170 g/15 mm.
Claim 11
Dependent Claim
55 words
A process as claimed in claim 7, wherein said widthwise stretched film consists of high-density polyethylene film having a density of at least 0.94 g/cm 3 and stretched more than six times as its original width without being positively oriented in the lengthwise direction so as to have a thickness of 0.01 to 0.05 mm.
Claim 12
Dependent Claim
42 words
A process as claimed in claim 7, wherein said release layer consists of a low-density polyethylene having a density of at most 0.93 g/cm 3 applied at a resin temperature of 220° to 290° C. prevailing at the outlets of die lips.
Claim 13
Dependent Claim
30 words
A process as claimed in claim 7, wherein the amount of said pressure-sensitive adhesive coated is so adjusted as to provide an adhesion strength of 500 to 3500 g/20 mm.
Claim 14
Dependent Claim
25 words
A process as claimed in claim 7, wherein a peel strength between said release layer and said adhesive layer is at most 150 g/20 mm.
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) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |