Patent US4626475A successfully refreshed from Google Patents.
US4626475A
Expired / Lapsed
US
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Polyurethane pressure sensitive adhesives for bonding layered structures
Assignee: Ashland LLC
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Filing: 1985-09-18
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Granted: 1986-12-02
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Expires: 2005-09-18
Abstract
Abstract A process for the production of a pressure sensitive adhesive comprising the interaction of a high molecular weight polyol, a polyisocyanate and a small amount of a bicyclic amide acetal wherein the process results in significant improvement in physical properties, e.g., a high degree of adhesive and cohesive strength, is described.
Inventors
- 👤 Anil Goel
- 👤 Joseph Holehouse
- 👤 Kenneth Barnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:18
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3825; C08G18/3827; C09; C09J; C09J175/00; C09J175/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31565; Y10T428/31605
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
62 words
The structure composed of at least two surfaces of at least two materials bonded together by the intercalation of a pressure sensitive adhesive produced by the reaction of a polyisocyanate and a polyol having a molecular weight of 400 or greater in the presence of from 1 to 10% by weight of a bicyclic amide acetal based on the weight of polyol.
Claim 2
Dependent Claim
62 words
The structure composed of at least two surfaces of at least two materials bonded together by the intercalation of a pressure sensitive adhesive produced by the reaction of a polyisocyanate and a polyol having a molecular weight of 400 or greater in the presence of from 1 to 10% by weight of a bicyclic amide acetal based on the weight of polyol.
Claim 3
Dependent Claim
78 words
The structure of claim 1 wherein the bicyclic amide acetal is one having the formula ##STR2## wherein R, R', R" and R"' independently represent hydrogen, an alkyl group having from 1 to 20 carbon atoms, an aryl group having from 6 to 12 carbon atoms, an alkaryl group having from 7 to 20 carbon atoms, an alkyl ether group having from 1 to 20 carbon atoms or an aryl ether group having from 6 to 20 carbon atoms.
Claim 4
Dependent Claim
19 words
The structure of claim 2 wherein the polyisocyanate has a NCO functionality of from 2 to 2.3 per molecule.
Claim 5
Dependent Claim
39 words
The structure of claim 3 wherein the equivalent ratio of the isocyanate functionality in the polyisocyanate to the combined hydroxy functionality in the polyol and bicyclic amide acetal functionality falls in the range of from about 0.8 to 1.3.
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) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |