Patent US4699810A successfully refreshed from Google Patents.
US4699810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing compositions
Assignee: WR Grace and Co Conn
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Filing: 1987-02-05
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Granted: 1987-10-13
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Expires: 2007-02-05
Abstract
Abstract A storage-stable container sealing composition which is fluid and comprises an aqueous dispersion of a visco elastic, generally elastomeric, polymer and hollow microspheres of a thermoplastic polymeric material containing a liquid blowing agent. The compositions are applied as gaskets to container closures and are heated to volatilize the blowing agent and expand the microspheres.
Inventors
- 👤 Peter J. Blakeman
- 👤 Terence R. Johnson
- 👤 Claes F. H. Pfeiffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:39
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/32; C09; C09K; C09K3/00; C09K3/10; C08J2203/00; C08J2203/14; C08J2203/22; C08J2321/00; C09K2200/00; C09K2200/02; C09K2200/0243; C09K2200/0247; C09K2200/06; C09K2200/0607; C09K2200/0612; C09K2200/0615; C09K2200/063; C09K2200/0635
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
55 words
A process for providing a container closure with a foamed sealing gasket comprising depositing a foamable container sealing composition, having an aqueous dispersion of a viscoelastic polymer and hollow microspheres containing a liquid blowing agent, onto a rim of the closure, heating the closure to foam the composition and securing the closure to a container.
Claim 2
Dependent Claim
55 words
A process for providing a container closure with a foamed sealing gasket comprising depositing a foamable container sealing composition, having an aqueous dispersion of a viscoelastic polymer and hollow microspheres containing a liquid blowing agent, onto a rim of the closure, heating the closure to foam the composition and securing the closure to a container.
Claim 3
Dependent Claim
31 words
A process according to claim 1 wherein the closure is heated at a temperature from about 80° to about 160° C. for a period from about 1 to about 60 minutes.
Claim 4
Dependent Claim
32 words
A process according to claim 2 wherein the closure is heated at a temperature from about 100° to about 140° C., for a period of from about 10 to about 30 minutes.
Claim 5
Dependent Claim
30 words
A process according to claim 1 wherein before the heating step, a coating is applied to the closure and the container and the heating step dries and cures the coating.
Claim 6
Dependent Claim
19 words
A process according to claim 4 wherein the coating is selected from the group consisting of lacquer and paint.
Claim 7
Dependent Claim
21 words
A process according to claim 1 wherein the diameter of the expanded microspheres is from about 10 to about 100 microns.
Claim 8
Dependent Claim
67 words
A process for providing a container closure with a foamed sealing gasket comprising the steps of depositing a foamable sealing composition of an aqueous dispersion of a viscoelastic polymer and hollow microspheres containing a blowing agent into a rim of the closure, securing the closure onto a container and heating the closure to volatilize the blowing agent and expand the microspheres to form a foamed sealing gasket.
Claim 9
Dependent Claim
67 words
A process for providing a container closure with a foamed sealing gasket comprising the steps of depositing a foamable sealing composition of an aqueous dispersion of a viscoelastic polymer and hollow microspheres containing a blowing agent into a rim of the closure, securing the closure onto a container and heating the closure to volatilize the blowing agent and expand the microspheres to form a foamed sealing gasket.
References Cited (Backward Citations)
FR1489081A
Cited
US3338456A
Cited
US3515569A
Cited
US3615972A
Cited
US3592782A
Cited
US3864181A
Cited
US4005033A
Cited
US4320076A
Cited
US4419459A
Cited
DE3100746A1
Cited
US4451584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |