US4440829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated bonding tapes having improved peel strength combined with low temperature flexibility
Assignee: HB Fuller Licensing and Financing Inc
•
Filing: 1982-06-29
•
Granted: 1984-04-03
•
Expires: 2002-06-29
Abstract
Abstract A coated bonding tape having improved peel strength combined with low temperature flexibility is disclosed in which a layer of impact-resistant material constituted by a milled layer of pigmented and plasticized elastomer is coated with a pressure-sensitive adhesive coating and in which the elastomer layer consists essentially of butyl rubbers, pigment and sufficient plasticizer for the elastomer to provide a half thickness reduction at a pressure below 800 psi. At least about 45% of the butyl rubber is cross-linked, at least about 20% of the butyl rubber is noncross-linked and has an average molecular weight of at least about 250,000, and at least about 60% of the pigment is of reinforcing character, the proportion of plasticizer providing a tape body having a strength of at least about 30 psi before plastic flow begins, and the pressure-sensitive adhesive coating is selected to provide a bond to the tape body which is strong enough to force the bonding tape to fail cohesively when peeled from a substrate.
Inventors
- 👤 Michael J. Gerace
- 👤 Jeffry D. Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:28
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/20; C09J7/22; C09J7/24; C09J7/241; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/25; Y10T428/259; Y10T428/28; Y10T428/31504; Y10T428/31826; Y10T428/31855; Y10T428/31909; Y10T428/31924
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
162 words
A coated bonding tape having improved peel strength combined with low temperature flexibility comprising, a layer of impact-resistant material constituted by a milled layer of pigmented and plasticized elastomer coated with a pressure-sensitive adhesive coating, said elastomer layer having an elastomer component consisting essentially of a mixture of butyl rubbers, pigment and plasticizer for said elastomer sufficient to provide a half thickness reduction at a pressure below 800 psi, at least about 45% of said butyl rubber mixture being cross-linked, at least about 20% of said butyl rubber mixture being noncross-linked with an average molecular weight above about 250,000, and at least about 60% of said pigment having reinforcing character, the proportion of plasticizer providing a tape body having a tensile strength of at least about 30 psi before plastic flow begins, and said pressure-sensitive adhesive coating being selected to provide a bond to said tape body strong enough to force said bonding tape to fail cohesively when peeled from a substrate.
Claim 2
Dependent Claim
162 words
A coated bonding tape having improved peel strength combined with low temperature flexibility comprising, a layer of impact-resistant material constituted by a milled layer of pigmented and plasticized elastomer coated with a pressure-sensitive adhesive coating, said elastomer layer having an elastomer component consisting essentially of a mixture of butyl rubbers, pigment and plasticizer for said elastomer sufficient to provide a half thickness reduction at a pressure below 800 psi, at least about 45% of said butyl rubber mixture being cross-linked, at least about 20% of said butyl rubber mixture being noncross-linked with an average molecular weight above about 250,000, and at least about 60% of said pigment having reinforcing character, the proportion of plasticizer providing a tape body having a tensile strength of at least about 30 psi before plastic flow begins, and said pressure-sensitive adhesive coating being selected to provide a bond to said tape body strong enough to force said bonding tape to fail cohesively when peeled from a substrate.
Claim 3
Dependent Claim
21 words
A coated bonding tape as recited in claim 1 in which the tape body's strength is at least about 35 psi.
Claim 4
Dependent Claim
21 words
A coated bonding tape as recited in claim 1 in which the tape body has a strength of from 35-45 psi.
Claim 5
Dependent Claim
24 words
A coated bonding tape as recited in claims 1 or 3 in which said reinforcing pigments are selected from carbon black and precipitated silica.
Claim 6
Dependent Claim
47 words
A coated bonding tape as recited in claim 1 in which from 28% to 33% of the tape body is elastomer, from 38% to 46% of the tape body is total pigment, and from 20% to 30% of the tape body is plasticizer for said elastomer component.
Claim 7
Dependent Claim
19 words
A trim strip having adhesively associated with the rear face thereof, the coated bonding tape recited in claim 1.
Claim 8
Dependent Claim
28 words
A coated bonding tape as recited in claim 1 in which the plasticizer content is sufficient to provide a half thickness reduction at a pressure below 700 psi.
Claim 9
Dependent Claim
33 words
A coated bonding tape as recited in claim 1 in which said pressure-sensitive adhesive coating is a self-curing acrylic solution copolymer which cures slowly over a long period of time at room temperature.
Claim 10
Dependent Claim
46 words
A coated bonding tape as recited in claim 1 in which from 3% to 20% of the total weight of butyl rubbers is constituted by a block copolymer of styrene and butadiene, said block copolymer containing from 15% to 45% by weight of styrene, balance butadiene.
Claim 11
Dependent Claim
31 words
A coated bonding tape as recited in claim 1 in which at least about 30% of said butyl rubber is noncross-linked butyl rubber having an average molecular weight above about 300,000.
Claim 12
Dependent Claim
18 words
A coated bonding tape as recited in claim 10 in which said molecular weight is above about 300,000.
Claim 13
Dependent Claim
26 words
A coated bonding tape as recited in claim 1 in which said cross-linked butyl rubber has a solubility in cyclohexane of about 10% to about 50%.
Claim 14
Dependent Claim
20 words
A coated bonding tape as recited in claim 12 in which said solubility is from about 10% to about 25%.
Claim 15
Dependent Claim
22 words
A coated bonding tape as recited in claims 1, 3, 11 or 12 in which said plasticizer consists essentially of liquid polybutenes.
Claim 16
Dependent Claim
28 words
A coated bonding tape as recited in claim 14 in which said liquid polybutenes have a viscosity in the range of from about 100 to about 4000 centistokes.
References Cited (Backward Citations)
US3896245A
Cited
US4061805A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |