US4287013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Comformable, multilayered tape adherent on one surface to fusable metal alloys and on the other surface to ophthalmic lens blanks
Assignee: 3M Co
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Filing: 1980-05-01
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Granted: 1981-09-01
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Expires: 2000-05-01
Abstract
Abstract A conformable, multi-layered tape for bonding fusible metal alloy to ophthalmic lens blanks is provided. The tape comprises a polymeric backing layer, a pressure-sensitive adhesive on one surface of the backing layer, and a non-tacky adhesion-promoting layer on the other surface of said backing layer. The tapes have a 2% secant modulus in the range of about 35 kg/cm 2 to 20,000 kg/cm 2 , a shear value of at least about 10 minutes, a 180° peel value in the range of about 60 g/cm width to 1400 g/cm width, a percent elongation at break in the range of about 45% to 1000% and a lap shear value of at least about 5 kg/cm 2 . Preferably the tapes also have a tensile strength at 100% elongation in the range of about 0.2 to 4 kg/cm.
Inventors
- 👤 Albert J. Ronning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:00
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/20; C09J7/29; C09J7/22; C09J2301/00; C09J2301/10; C09J2301/16; C09J2301/162; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2839; Y10T428/2848; Y10T428/2852; Y10T428/2857; Y10T428/2878; Y10T428/2883; Y10T428/2891
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
180 words
A conformable, multilayered tape for bonding fusible metal alloy to an opthalmic lens blank which comprises a polymer backing layer, a pressure sensitive adhesive on one major surface of said backing layer, and a tack-free adhesion-promoting layer on the other major surface of said backing, wherein, when said tape is interposed between an ophthalmic lens blank and a fusible metal alloy so that said adhesive contacts said lens blank and said adhesion-promoting layer contacts said fusible metal alloy, the bond strength between said alloy and said lens blank is greater than the bond strength between said alloy and said lens blank if said tape were not present; and wherein said tape has a 2% secant modulus in the range of about 35 kg/cm 2 to 20,000 kg/cm 2 , a sheer value of at least about 10 minutes, a 180° peel value in the range of about 60 g/cm width to 1400 g/cm width, a percent elongation at break in the range of about 45% to 1,000% and a lap shear value of at least about 5 kg/cm 2 .
Claim 2
Dependent Claim
180 words
A conformable, multilayered tape for bonding fusible metal alloy to an opthalmic lens blank which comprises a polymer backing layer, a pressure sensitive adhesive on one major surface of said backing layer, and a tack-free adhesion-promoting layer on the other major surface of said backing, wherein, when said tape is interposed between an ophthalmic lens blank and a fusible metal alloy so that said adhesive contacts said lens blank and said adhesion-promoting layer contacts said fusible metal alloy, the bond strength between said alloy and said lens blank is greater than the bond strength between said alloy and said lens blank if said tape were not present; and wherein said tape has a 2% secant modulus in the range of about 35 kg/cm 2 to 20,000 kg/cm 2 , a sheer value of at least about 10 minutes, a 180° peel value in the range of about 60 g/cm width to 1400 g/cm width, a percent elongation at break in the range of about 45% to 1,000% and a lap shear value of at least about 5 kg/cm 2 .
Claim 3
Dependent Claim
22 words
A tape according to claim 1 wherein said adhesion-promoting layer is selected from urethane polymers, vinyl polymers, synthetic rubber, and mixtures thereof.
Claim 4
Dependent Claim
14 words
A tape according to claim 2 wherein said adhesion-promoting layer is a urethane polymer.
Claim 5
Dependent Claim
20 words
A tape according to claim 3 wherein said urethane polymer is selected from polyester urethane polymers and polyether urethane polymers.
Claim 6
Dependent Claim
14 words
A tape according to claim 4 wherein said urethane polymer is a polyether urethane.
Claim 7
Dependent Claim
14 words
A tape according to claim 4 wherein said urethane polymer is a polyester urethane.
Claim 8
Dependent Claim
14 words
A tape according to claim 2 wherein said adhesion-promoting layer is a vinyl polymer.
Claim 9
Dependent Claim
52 words
A tape according to claim 7 wherein said vinyl polymer is selected from polyvinyl chloride, polyvinyl acetate, polyvinylidene chloride, copolymers of vinyl chloride with vinyl acetate, vinyl alcohol, and vinylidene chloride, copolymers of vinyl acetate and vinyl alcohol, poly(ethyl acrylate), poly(methyl acrylate), poly(methyl methacrylate) and copolymers of ethyl acrylate and methyl acrylate.
Claim 10
Dependent Claim
12 words
A tape according to claim 8 wherein said vinyl polymer is plasticized.
Claim 11
Dependent Claim
14 words
A tape according to claim 2 wherein said adhesion-promoting layer is a synthetic rubber.
Claim 12
Dependent Claim
14 words
A tape according to claim 10 wherein said synthetic rubber is a nitrile rubber.
Claim 13
Dependent Claim
37 words
A tape according to claim 2 wherein said adhesion-promoting layer comprises from about 60 to 90 parts by weight of said urethane polymer and, correspondingly from about 40 to 10 parts by weight of said vinyl polymer.
Claim 14
Dependent Claim
13 words
A tape according to claim 12 wherein said urethane is a polyester urethane.
Claim 15
Dependent Claim
30 words
A tape according to claim 1 wherein said pressure sensitive adhesive is selected from polyacrylate pressure sensitive adhesives, natural rubber pressure sensitive adhesives and rubbery block copolymer pressure sensitive adhesives.
Claim 16
Dependent Claim
17 words
A tape according to claim 14 wherein said pressure sensitive adhesive is a polyacrylate pressure sensitive adhesive.
Claim 17
Dependent Claim
26 words
A tape according to claim 15 wherein said polyacrylate pressure sensitive adhesive comprises a polymer of an acrylate ester of acrylic acid with a non-tertiary alcohol.
Claim 18
Dependent Claim
28 words
A tape according to claim 16 wherein said pressure sensitive adhesive comprises a polymer comprising 90 parts by weight isoctyl acrylate and 10 parts by weight acrylic acid.
Claim 19
Dependent Claim
16 words
A tape according to claim 17 wherein said pressure sensitive adhesive is at least partially crosslinked.
Claim 20
Dependent Claim
26 words
A tape according to claim 2 wherein said backing layer is selected from polyolefinic films, polyvinyl films, polyester films, polyurethane films, cellulosic films, and polyamide films.
Claim 21
Dependent Claim
13 words
A tape according to claim 19 wherein said backing is a polyolefinic film.
Claim 22
Dependent Claim
22 words
A tape according to claim 20 wherein said polyolefinic film is selected from low and medium density polyethylene, chlorinated polyethylene and polypropylene.
Claim 23
Dependent Claim
18 words
A tape according to claim 21 wherein said polyolefinic film is selected from low and medium density polyethylene.
Claim 24
Dependent Claim
22 words
A tape according to claim 1 having a tensile strength at 100% elongation in the range of about 0.2 to 4 kg/cm.
Claim 25
Dependent Claim
7 words
A translucent tape according to claim 1.
Claim 26
Dependent Claim
94 words
A method of adhering a fusible metal alloy to a compound surface of an ophthalmic lens blank comprising applying the pressure-sensitive adhesive portion of a section of the conformable multilayered tape according to claim 1 to the entirety of a compound surface of an ophthalmic lens blank; conforming said tape to said surface so that said tape is free from wrinkles, air bubbles and other discontinuities in the bond between said tape and said lens blank; and applying a fusible metal alloy to at least a portion of the adhesion-promoting layer of said tape.
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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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |