US4339485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensitive adhesive products
Assignee: Lintec Corp
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Filing: 1979-11-02
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Granted: 1982-07-13
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Expires: 1999-11-02
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
2026-10-23 14:21
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: 13
Claim 1
Independent Claim
129 words
Pressure sensitive adhesive products having one or more release layers and a pressure sensitive adhesive layer, in which a release layer comprises a polyolefinic elastomer having a shearing modulus of less than 2.0×10 8 dyne/cm 2 according to JIS K 7213 test, surface wettability expressed in terms of an equilibrium contact angle for 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 a thickness of at least 1 micron, and a pressure sensitive adhesive layer contains as a main component a polyacrylate, said release layer being kept in contact with said adhesive layer over a given area to form a composite layer or integral thereof.
Claim 2
Dependent Claim
129 words
Pressure sensitive adhesive products having one or more release layers and a pressure sensitive adhesive layer, in which a release layer comprises a polyolefinic elastomer having a shearing modulus of less than 2.0×10 8 dyne/cm 2 according to JIS K 7213 test, surface wettability expressed in terms of an equilibrium contact angle for 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 a thickness of at least 1 micron, and a pressure sensitive adhesive layer contains as a main component a polyacrylate, said release layer being kept in contact with said adhesive layer over a given area to form a composite layer or integral thereof.
Claim 3
Dependent Claim
79 words
The pressure sensitive adhesive products as recited in claim 1, in which said polyolefinic elastomer forming said release layer is composed mainly of an ethylene - alpha olefin copolymer having a density of 0.80 to 0.90 g/cm 2 , a brittle temperature of lower than -70° C. according to ASTM D 764 test, a melting point of lower than 80° C. according to differential thermal analysis and a hardness of lower than 80 according to JIS K 6301 test.
Claim 4
Dependent Claim
25 words
The pressure sensitive adhesive products as recited in claim 1 or 2, in which said copolymer of ethylene/alpha olefin is a random copolymer of ethylene-1-butene.
Claim 5
Dependent Claim
24 words
The pressure sensitive adhesive products as recited in claim 1 or 2, in which said copolymer of ethylene/alpha olefin is a copolymer or ethylene/propylene.
Claim 6
Dependent Claim
33 words
The pressure sensitive adhesive products as recited in claim 1 or 2, in which said copolymer of ethylene/alpha olefin is a mixture of a random copolymer of ethylene-1-butene and a copolymer of ethylene/propylene.
Claim 7
Dependent Claim
139 words
Pressure sensitive adhesive products having one or more release layer and a pressure sensitive adhesive layer, in which a release layer has a thickness of at least 1 micron and comprises 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, 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 a polyethylene added thereto, and a pressure sensitive adhesive layer contains a polyacrylate as a main component, said release layer being kept in contact with said adhesive layer over a given area to form a composite or integral layer thereof.
Claim 8
Dependent Claim
139 words
Pressure sensitive adhesive products having one or more release layer and a pressure sensitive adhesive layer, in which a release layer has a thickness of at least 1 micron and comprises 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, 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 a polyethylene added thereto, and a pressure sensitive adhesive layer contains a polyacrylate as a main component, said release layer being kept in contact with said adhesive layer over a given area to form a composite or integral layer thereof.
Claim 9
Dependent Claim
61 words
The pressure sensitive adhesive products as recited in claim 6, in which said polyolefinic elastomer is composed mainly of an ethylene-alpha olefin copolymer having a density of 0.80 to 0.90 g/cm 3 , a brittle temperature of lower than -70° C. according to ASTM D 764 test and a melting point of lower than 80° C. according to differential thermal analysis.
Claim 10
Dependent Claim
22 words
The pressure sensitive adhesive products as recited in claim 7, in which said copolymer of ethylene/alpha olefin is a copolymer of ethylene/propylene.
Claim 11
Dependent Claim
23 words
The pressure sensitive adhesive products as recited in claim 7, in which said copolymer of ethylene/alpha olefin is a random copolymer of ethylene-1-butene.
Claim 12
Dependent Claim
31 words
The pressure sensitive adhesive products as recited in claim 7, in which said copolymer of ethylene/alpha olefin is a mixture of a random copolymer of ethylene-1-butene and a copolymer of ethylene/propylene.
Claim 13
Dependent Claim
33 words
The pressure sensitive adhesive products as recited in claim 6, in which said polyethylene has an average molecular weight of more than 10,000 and a density of 0.91 to 0.97 g/cm 3 .
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) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |