US4668576A
Expired / Lapsed
US
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Tape primer composition
Assignee: Nitto Denko Corp
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Filing: 1985-07-09
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Granted: 1987-05-26
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Expires: 2005-07-09
Abstract
Abstract A tape primer composition that forms a primer coat between a polyethylene film or sheet support and an overlying butyl rubber base adhesive layer is described, said primer composition consisting essentially of a butyl rubber, a polyisocyanate compound, and an organic solvent.
Inventors
- 👤 Isao Yotsuya
- 👤 Kenji Suzuki
- 👤 Kazumasa Asano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:22
CPC Classifications
C; C09; C09J; C09J123/00; C09J123/02; C09J123/18; C09J123/20; C09J123/22; C09J7/00; C09J7/50; C08; C08L; C08L2666/00; C08L2666/28; C08L2666/36; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2843; Y10T428/2848; Y10T428/2852; Y10T428/2857; Y10T428/2878; Y10T428/2896; Y10T428/31504; Y10T428/31551; Y10T428/31569; Y10T428/31573; Y10T428/31587
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
54 words
A tape primer composition that forms a primer coat between a polyethylene film or sheet support and a butyl rubber base adhesive layer in the state of contacting the primer coat with both the support and the adhesive layer, said primer composition consisting essentially of a butyl rubber, polyisocyanate compound, and an organic solvent.
Claim 2
Dependent Claim
54 words
A tape primer composition that forms a primer coat between a polyethylene film or sheet support and a butyl rubber base adhesive layer in the state of contacting the primer coat with both the support and the adhesive layer, said primer composition consisting essentially of a butyl rubber, polyisocyanate compound, and an organic solvent.
Claim 3
Dependent Claim
39 words
A primer composition according to claim 1 wherein the butyl rubber is at least one member selected from the group consisting of a virgin buty rubber, a reclaimed butyl rubber, a chlorinated butyl rubber, and a brominated butyl rubber.
Claim 4
Dependent Claim
87 words
A primer composition according to claim 2 wherein said reclaimed butyl rubber has a specific gravity of from 1.14 to 1.18, a rubber content of 50 to 59 wt% as rubber hydrocarbons, acetone solubles of 4 to 16 wt%, a Mooney viscosity ML 1+4 (100° C.) of from 25 to 70, a carbon black content of from 30 to 32 wt%, elongation after vulcanization ≧450% as determined in accordance with JIS K-6313, and tensile strength after vulcanization ≧65 kg/cm 2 as determined in accordance with JIS K-6313.
Claim 5
Dependent Claim
45 words
A primer composition according to claim 2 wherein said chlorinated butyl rubber has a chlorine content of from 1.0 to 1.4 wt% and a Mooney viscosity ML 1+8 (125° C.) of from 45 to 55 and ML 1+8 (100° C.) of from 51 to 60.
Claim 6
Dependent Claim
39 words
A primer composition according to claim 2 wherein said brominated butyl rubber has a bromine content of from 1.8 to 2.4 wt% and a Mooney viscosity ML 1+8 (125° C.) of from 27 to 34 and 41 to 51.
Claim 7
Dependent Claim
20 words
A primer composition according to claim 1 wherein said polyisocyanate compound contains two or three isocyanate groups in the molecule.
Claim 8
Dependent Claim
30 words
A primer composition according to claim 1 wherein said polyisocyanate compound is present in an amount of at least 0.8 part per 100 parts by weight of the butyl rubber.
Claim 9
Dependent Claim
31 words
A primer composition according to claim 1 wherein said polyisocyanate compound is present in an amount of from 1 to 200 parts per 100 parts by weight of the butyl rubber.
Claim 10
Dependent Claim
31 words
A primer composition according to claim 7 wherein said polyisocyanate compound is present in an amount of from 1 to 200 parts per 100 parts by weight of the butyl rubber.
Claim 11
Dependent Claim
36 words
A primer composition according to claim 2 wherein said organic solvent is present in an amount of from 9 to 100 parts per part by weight of the sum of the butyl rubber and polyisocyanate compound.
Claim 12
Dependent Claim
47 words
A polyethylene film or sheet support carrying thereon a butyl rubber base adhesive layer, the improvement comprising a primer composition interposed between said film or sheet support and said base adhesive layer, said primer composition consisting essentially of a butyl rubber, a polyisocyanate, and an organic solvent.
Claim 13
Dependent Claim
47 words
A polyethylene film or sheet support carrying thereon a butyl rubber base adhesive layer, the improvement comprising a primer composition interposed between said film or sheet support and said base adhesive layer, said primer composition consisting essentially of a butyl rubber, a polyisocyanate, and an organic solvent.
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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) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |