Patent US3887745A successfully refreshed from Google Patents.
US3887745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finger-tearable adhesive tape
Assignee: Toray Industries Inc
•
Filing: 1973-08-09
•
Granted: 1975-06-03
•
Expires: 1993-08-09
Abstract
Abstract This invention pertains to an adhesive tape, the base component of which is comprised of a biaxially oriented film of a propylene polymer and a transversely oriented film of a propylene polymer, the melting point of the transversely oriented film being 0.5* 10*C higher than that of the biaxially oriented film and the total thickness of the transversely oriented film being 1.2 - 5.0 times greater than that of the biaxially oriented film.
Inventors
- 👤 Toshiya Yoshii
- 👤 Masaru Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:02
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/20; C09J7/29; B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B2250/00; B32B2250/03; B32B2323/00; B32B2323/10; B32B2405/00; C09J2301/00; C09J2301/10; C09J2301/16; C09J2301/162; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
A finger-tearable adhesive tape having longitudinal and transverse dimensions and having an adhesive layer applied to a laminated film base, said base comprising a layer of propylene polymer film which is biaxially oriented and at least one other layer of a propylene polymer film which is uniaxially oriented in a transverse direction, the melting point of said uniaxially oriented film being 0.5* - 10* C higher than the melting point of said biaxially oriented film, and the total thickness of said uniaxially oriented film being 1.2 - 5.0 times greater than the total thickness of said biaxially oriented film.
Claim 2
Dependent Claim
99 words
A finger-tearable adhesive tape having longitudinal and transverse dimensions and having an adhesive layer applied to a laminated film base, said base comprising a layer of propylene polymer film which is biaxially oriented and at least one other layer of a propylene polymer film which is uniaxially oriented in a transverse direction, the melting point of said uniaxially oriented film being 0.5* - 10* C higher than the melting point of said biaxially oriented film, and the total thickness of said uniaxially oriented film being 1.2 - 5.0 times greater than the total thickness of said biaxially oriented film.
Claim 3
Dependent Claim
93 words
A FINGER-TEARABLE ADHESIVE TAPE HAVING LONGITUDINAL AND TRANSVERSE DIMENSIONS AND HAVING AN ADHESIVE LAYER APPLIED TO A LAMINATED FILM BASE, SAID COMPRISING A LAYER OF PROPYLENE POLYMER FILM WHICH IS BIAXIALLY ORIENTED AND AT LEAST ONE OTHER LAYER OF A PROPYLENE POLYMER FILM WHICH IS UNIAXIALLY ORIENTED IN A TRANSVERSE DIRECTION, THE MELTING POINT OF SAID UNIAXIALLY ORIENTED FILM BEING 0.5*-10*C HIGHER THAN THE MELTING POINT OF SAID BIAXIALLY ORIENTED FILM, AND THE TOTAL THICKNESS OF SAID UNIAXIALLY ORIENTED FILM BEING 1.2-5.0 TIMES GREATER THAN THE TOTAL THICKNESS OF SAID BIAXIALLY ORIENTED FILM.
Claim 4
Dependent Claim
93 words
A FINGER-TEARABLE ADHESIVE TAPE HAVING LONGITUDINAL AND TRANSVERSE DIMENSIONS AND HAVING AN ADHESIVE LAYER APPLIED TO A LAMINATED FILM BASE, SAID COMPRISING A LAYER OF PROPYLENE POLYMER FILM WHICH IS BIAXIALLY ORIENTED AND AT LEAST ONE OTHER LAYER OF A PROPYLENE POLYMER FILM WHICH IS UNIAXIALLY ORIENTED IN A TRANSVERSE DIRECTION, THE MELTING POINT OF SAID UNIAXIALLY ORIENTED FILM BEING 0.5*-10*C HIGHER THAN THE MELTING POINT OF SAID BIAXIALLY ORIENTED FILM, AND THE TOTAL THICKNESS OF SAID UNIAXIALLY ORIENTED FILM BEING 1.2-5.0 TIMES GREATER THAN THE TOTAL THICKNESS OF SAID BIAXIALLY ORIENTED FILM.
Claim 5
Dependent Claim
28 words
An adhesive tape according to claim 1, wherein the melting point of said uniaxially oriented film is 1* - 5*C higher than that of said biaxially oriented film.
Claim 6
Dependent Claim
31 words
An adhesive tape according to claim 1, wherein the total thickness of said uniaxially oriented film is 1.5 - 3.0 times greater than the total thickness of said biaxially oriented film.
Claim 7
Dependent Claim
19 words
An adhesive tape according to claim 1, wherein the birefringence of said laminated film is from 0.015 to 0.030.
Claim 8
Dependent Claim
35 words
An adhesive tape according to claim 1, wherein the Intrinsic Viscosity in tetralin at 135*C is 1.5 - 2.2 for said uniaxially oriented propylene polymer and 1.8 - 2.8 for said biaxially oriented propylene polymer.
Claim 9
Dependent Claim
39 words
An adhesive tape according to claim 1, wherein said uniaxially oriented film has an Isotacticity Index of 90 - 98 percent by weight and said biaxially oriented film has as Isotacticity Index of 80 - 97 percent by weight.
Claim 10
Dependent Claim
13 words
An adhesive tape according to claim 1, wherein said propylene polymer is polypropylene.
References Cited (Backward Citations)
US3671383A
Cited
US3620825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |