Patent US5143995A successfully refreshed from Google Patents.
US5143995A
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US
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Adhesives based on polyols and polyisocyanates
Assignee: Bayer AG
•
Filing: 1991-06-27
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Granted: 1992-09-01
•
Expires: 2011-06-27
Abstract
Abstract Disclosed herein is a transparent adhesive containing isocyanate groups based on at least one polyol and at least one polyisocyanate, characterized in that the adhesive contains urea groups.
Inventors
- 👤 Walter Meckel
- 👤 Eduard Hansel
- 👤 Otto Ganster
- 👤 Gunter Arend
- 👤 Jorg Buchner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:02
CPC Classifications
C; C09; C09J; C09J175/00; C09J175/04; C09J175/12; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/12; C08G18/28; C08G18/30; C08G18/302; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5036; C08G18/5042; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7825
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
A transparent adhesive containing isocyanate groups based on at least one polyol and at least one polyisocyanate, characterized in that the adhesive contains a urea group corresponding to the following formula X--R--NH--CO--NH--R'--Y in which X and Y may be the same or different and represent NCO and/or --Z--CO--NH--, X and Y being attached to R and R' via the N atom of the NH group, Z represents O, S, NH, R and R' may be the same or different and represent the residue of a polyisocyanate containing at least two NCO groups of different reactivity after removal of the two NCO groups.
Claim 2
Dependent Claim
102 words
A transparent adhesive containing isocyanate groups based on at least one polyol and at least one polyisocyanate, characterized in that the adhesive contains a urea group corresponding to the following formula X--R--NH--CO--NH--R'--Y in which X and Y may be the same or different and represent NCO and/or --Z--CO--NH--, X and Y being attached to R and R' via the N atom of the NH group, Z represents O, S, NH, R and R' may be the same or different and represent the residue of a polyisocyanate containing at least two NCO groups of different reactivity after removal of the two NCO groups.
Claim 3
Dependent Claim
19 words
An adhesive as claimed in claim 1, characterized in that the polyol is a polyester, polyether or polyether ester.
Claim 4
Dependent Claim
24 words
An adhesive as claimed in claim 1, characterized in that the adhesive contains 0.15 to 4.0% by weight --NH--CO--NH-- groups based on the adhesive.
Claim 5
Dependent Claim
24 words
An adhesive as claimed in claim 3, characterized in that the adhesive contains 0.3 to 3.0% by weight --NH--CO--NH-- groups based on the adhesive.
Claim 6
Dependent Claim
27 words
An adhesive as claimed in claim 1, characterized in that R and R' represent an aryl, alkyl, cycloalkyl or aralkyl radical which may be substituted or unsubstituted.
Claim 7
Dependent Claim
18 words
An adhesive as claimed in claim 1, characterized in that X and Y represent isocyanate and/or urethane groups.
Claim 8
Dependent Claim
25 words
An adhesive as claimed in claim 1, characterized in that the polyol contains a urea group and is combined with polyisocyanates in a two-component reaction.
Claim 9
Dependent Claim
27 words
An adhesive as claimed in claim 1, characterized in that a polyol containing urea group and a polyisocyanate containing urea group are combined in a two-component reaction.
Claim 10
Dependent Claim
20 words
An adhesive as claimed in claim 1, characterized in that a polyisocyanate containing a urea group is a one-component adhesive.
Claim 11
Dependent Claim
28 words
A process for producing a composite film comprising applying an adhesive as claimed in claim 1 to the surface of a film and contacting it with another film.
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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) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |