Patent US2998767A successfully refreshed from Google Patents.
Patent US4940852A successfully refreshed from Google Patents.
US4940852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensitive adhesive composition
Assignee: Individual
•
Filing: 1988-11-14
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Granted: 1990-07-10
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Expires: 2008-11-14
Abstract
Abstract A liquid or viscous curable adhesive composition having a prolonged pot life which is composed of a liquid or viscous curable resin which has, preferably evenly and randomly dispersed therethroughout, a multiplicity of rupturable microcapsules containing a curing agent in an amount sufficient to cure the resin. The microcapsules are rupturable upon the application thereto of external pressure, or other mechanical manipulation. Upon rupture, the curing agent is released into coacting relationship with the curable resin and forms therewith an activated adhesive composition.
Inventors
- 👤 Milton Chernack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:06
CPC Classifications
C; C09; C09J; C09J167/00; C09J167/06; C08; C08G; C08G59/00; C08G59/18; C08G59/188; C08K; C08K9/00; C08K9/10; C09J163/00; C09J4/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
64 words
A liquid curable adhesive composition having a prolonged pot life comprising as a liquid curable resin resorcinol-formaldehyde resin; and a microencapsulated curing agent dispersed throughout said resin in an amount sufficient to cure said resin, said microcapsules being rupturable upon the application of pressure for releasing said agent and curing said adhesive composition; said resin and said curing agent being non-reactive with said microcapsules.
Claim 2
Dependent Claim
64 words
A liquid curable adhesive composition having a prolonged pot life comprising as a liquid curable resin resorcinol-formaldehyde resin; and a microencapsulated curing agent dispersed throughout said resin in an amount sufficient to cure said resin, said microcapsules being rupturable upon the application of pressure for releasing said agent and curing said adhesive composition; said resin and said curing agent being non-reactive with said microcapsules.
Claim 3
Dependent Claim
15 words
The adhesive composition of claim 1, additionally comprising fillers, thixotropic agents and/or a coupling agent.
Claim 4
Dependent Claim
20 words
The adhesive composition of claim 1, wherein the diameter of the microcapsules is between about 5 and about 1000 microns.
Claim 5
Dependent Claim
21 words
The adhesive composition of claim 1, wherein the microcapsules have a shell thickness of from about 1 to about 60 nm.
Claim 6
Dependent Claim
23 words
The adhesive composition of claim 1, wherein the density of the liquid curable resin is substantially equal to the density of the microcapsules.
Claim 7
Dependent Claim
13 words
The adhesive composition of claim 1, wherein the microencapsulated curing agent is hexamethylentetramine.
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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) | 1993-07-09 | 1994-01-08 | 1994-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-09 | 1998-01-08 | 1998-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-09 | 2002-01-08 | 2002-07-10 | $7700.00 | Window Closed / Lapsed |