US4425176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensitive adhesive products and the method for preparation of the same
Assignee: Lintec Corp
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Filing: 1982-03-19
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Granted: 1984-01-10
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Expires: 2002-03-19
Abstract
Abstract Pressure sensitive adhesive products or articles having one or more release layers and a pressure sensitive adhesive layer, said one or more release layer comprising a polyolefinic elastomer having a shearing modulus of less than 2.0x108 dyne/cm2 and surface wettability expressed in terms of an equilibrium contact angle of more than 55 DEG with respect to a standard liquid, and said adhesive layer being composed mainly of a polyacrylate. To increase the adhesion between the release layer and a backing substrate, a reinforcing interlayer may be used. As the release layer, a mixture of the polyolefinic elastomer and polyethylene may be used. The release layer is then kept in contact with the adhesive layer over a given area to form a composite or integral layer thereof as by extrusion coating.
Inventors
- 👤 Tomishi Shibano
- 👤 Sachio Maruchi
- 👤 Koji Yakan
- 👤 Tadashi Kobayashi
- 👤 Saburo Akimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:46
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/20; C09J7/21; C09J7/201; C09J2400/00; C09J2400/20; C09J2400/28; C09J2400/283; C09J2423/00; C09J2423/005; C09J2423/16; C09J2423/165; C09J2433/00; Y; Y10; Y10T; Y10T156/00; Y10T156/11; Y10T156/1168; Y10T156/1195; Y10T428/00; Y10T428/14; Y10T428/1452; Y10T428/28; Y10T428/2839; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
A method of preparing pressure sensitive adhesive products having one or more release layer and poly acrylate-based pressure sensitive adhesive layer, which comprises co-extruding a release layer consisting of a polyolefinic elastomer having a shearing modulus of less than 2.0×10 8 dyne/cm 2 according to JIS K 7213 test and surface wettability expressed in terms of an equilibrium contact angle of more than 55° with respect to a standard liquid having a surface tension of 50 dyne/cm and used in JIS K 6768 test under the conditions of 20±1° C. and 65±5% RH and olefinic resin forming a reinforcing interlayer for increasing the adhesion between a backing substrate and said release layer such that said elastomer is coated to a thickness of at least 1 micron, said elastomer forming said release layer being bonded to said substrate through said reinforcing interlayer, and said elastomer forming said release layer is kept in contact with said pressure sensitive adhesive layer over a given area to form a composite or integral layer thereof.
Claim 2
Independent Claim
170 words
A method of preparing pressure sensitive adhesive products having one or more release layer and poly acrylate-based pressure sensitive adhesive layer, which comprises co-extruding a release layer consisting of a polyolefinic elastomer having a shearing modulus of less than 2.0×10 8 dyne/cm 2 according to JIS K 7213 test and surface wettability expressed in terms of an equilibrium contact angle of more than 55° with respect to a standard liquid having a surface tension of 50 dyne/cm and used in JIS K 6768 test under the conditions of 20±1° C. and 65±5% RH and olefinic resin forming a reinforcing interlayer for increasing the adhesion between a backing substrate and said release layer such that said elastomer is coated to a thickness of at least 1 micron, said elastomer forming said release layer being bonded to said substrate through said reinforcing interlayer, and said elastomer forming said release layer is kept in contact with said pressure sensitive adhesive layer over a given area to form a composite or integral layer thereof.
Claim 3
Dependent Claim
22 words
The method as recited in claim 1, in which said resin forming said reinforcing interlayer is a low-density polyethylene or its derivative.
Claim 4
Dependent Claim
52 words
The method as recited in claim 2, in which said polyolefinic elastomer is extruded at a temperature of 180° to 290° C. prevailing at the outlet of die lips, and said resin forming said reinforcing interlayer extruded at a temperature of 260° to 330° C. prevailing at the outlet of die lips.
Claim 5
Independent Claim
182 words
A method of preparing pressure sensitive adhesive products having one or more release layer and a poly acrylate-based pressure sensitive adhesive layer, which comprises co-extruding a release layer composed of a resin mixture of a polyolefinic elastomer having a shearing modulus of less than 2.0×10 8 dyne/cm 2 according to JIS K 7213 test and surface wettability expressed in terms of an equilibrium contact angle of more 55° with respect to a standard liquid having a surface tension of 50 dyne/cm and used in JIS K 6768 test under the conditions of 20±1° C. and 65±5% RH and a polyethylene added thereto and olefinic resin forming a reinforcing interlayer for increasing the adhesion between a backing substrate and said release layer such that said resin mixture is coated to a thickness of at least 1 micron, said resin mixture forming said release layer being bonded to said substrate through said resin forming said interlayer, and said release layer consisting of said resin mixture being in contact with said adhesive layer over a given area to form a composite or integral layer thereof.
Claim 6
Independent Claim
182 words
A method of preparing pressure sensitive adhesive products having one or more release layer and a poly acrylate-based pressure sensitive adhesive layer, which comprises co-extruding a release layer composed of a resin mixture of a polyolefinic elastomer having a shearing modulus of less than 2.0×10 8 dyne/cm 2 according to JIS K 7213 test and surface wettability expressed in terms of an equilibrium contact angle of more 55° with respect to a standard liquid having a surface tension of 50 dyne/cm and used in JIS K 6768 test under the conditions of 20±1° C. and 65±5% RH and a polyethylene added thereto and olefinic resin forming a reinforcing interlayer for increasing the adhesion between a backing substrate and said release layer such that said resin mixture is coated to a thickness of at least 1 micron, said resin mixture forming said release layer being bonded to said substrate through said resin forming said interlayer, and said release layer consisting of said resin mixture being in contact with said adhesive layer over a given area to form a composite or integral layer thereof.
Claim 7
Dependent Claim
22 words
The method is recited in claim 4, in which said resin forming said reinforcing interlayer is a low-density polyethylene or its derivative.
Claim 8
Dependent Claim
48 words
The method as recited in claim 5, in which said resin mixture is extruded at a temperature of 200° to 290° C. prevailing at the outlets of die lips, and said resin extruded at a temperature of 260° to 330° C. prevailing at the outlets of die lips.
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) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |