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US4485192A
Expired / Lapsed
US
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Plastisol sealing gaskets puffed with hollow discrete spheres
Assignee: WR Grace and Co Conn
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Filing: 1983-06-14
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Granted: 1984-11-27
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Expires: 2003-06-14
Abstract
Abstract A container sealing composition made from a plastisol having a mass of hollow discrete microspheres incorporated therein. The composition is characterized by having increased shelf life, as manifested in reduced separation of the hollow discrete microspheres from the plastisol, and improved viscosity stability. The container sealing composition also exhibits uniform void volume which is essential for good sealability and seal quality.
Inventors
- 👤 David A. Gibbs
- 👤 Robert H. Hofeldt
- 👤 Charles A. Billings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:41
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/22; B; B65; B65D; B65D53/00; C09; C09K; C09K3/00; C09K3/10; C09K2200/00; C09K2200/02; C09K2200/0243; C09K2200/06; C09K2200/0615; C09K2200/063; C09K2200/0632; C09K2200/0635; C09K2200/0645; C09K2200/067; C09K2200/0672
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
75 words
A sealing gasket having uniform void volume comprised of a plastisol comprised of a plasticizer and a resin wherein at least about 70 percent of said resin is formed by dispersion polymerization said plastisol having incorporated therein hollow discrete microspheres with alkalinity no greater than about 0.5 milliequivalent per gram, the diameter ranging from about 1 to about 1 to about 300 microns and a wall thickness of not in excess of about 5 microns.
Claim 2
Dependent Claim
75 words
A sealing gasket having uniform void volume comprised of a plastisol comprised of a plasticizer and a resin wherein at least about 70 percent of said resin is formed by dispersion polymerization said plastisol having incorporated therein hollow discrete microspheres with alkalinity no greater than about 0.5 milliequivalent per gram, the diameter ranging from about 1 to about 1 to about 300 microns and a wall thickness of not in excess of about 5 microns.
Claim 3
Dependent Claim
18 words
The sealing gasket of claim 1 wherein about 100 percent of said resin is formed by dispersion polymerization.
Claim 4
Dependent Claim
13 words
The sealing gasket of claim 2 further comprising at least one separation inhibitor.
Claim 5
Dependent Claim
28 words
The sealing gasket of claim 1 wherein the hollow discrete microspheres are selected from the group consisting of glass, polystyrene resin, phenolic resin or polyvinylidene chloride acrylonitrile resin.
Claim 6
Dependent Claim
34 words
The sealing gasket of claim 4 wherein the hollow discrete microspheres have a diameter ranging from about 1 to about 300 microns and have a wall thickness not in excess of about 5 microns.
Claim 7
Dependent Claim
76 words
A sealing gasket having uniform void volume comprised of a plastisol comprised of a plasticizer and a resin wherein about 100 percent of said resin is formed by dispersion polymerization said plastisol having incorporated therein hollow discrete microspheres with alkalinity greater than about 0.5 milliequivalents per gram, the diameter ranging from about 1 to about 300 microns and having a wall thickness of not in excess of about 5 microns, and at least one separation inhibitor.
Claim 8
Dependent Claim
76 words
A sealing gasket having uniform void volume comprised of a plastisol comprised of a plasticizer and a resin wherein about 100 percent of said resin is formed by dispersion polymerization said plastisol having incorporated therein hollow discrete microspheres with alkalinity greater than about 0.5 milliequivalents per gram, the diameter ranging from about 1 to about 300 microns and having a wall thickness of not in excess of about 5 microns, and at least one separation inhibitor.
Claim 9
Dependent Claim
26 words
The sealing gasket of claim 6 wherein the separation inhibitor is selected from the group consisting of colloidal silica, bentonite clay, wax or some combination thereof.
Claim 10
Dependent Claim
13 words
The sealing gasket of claim 6 wherein the hollow discrete microspheres are glass.
Claim 11
Dependent Claim
96 words
A sealing gasket having uniform void volume comprised of a plastisol comprised of about 5 to about 150 parts by weight of plasticizer per 100 parts by weight of resin wherein at least about 70 percent of said resin is formed by dispersion polymerization said plastisol having incorporated therein and about 5 to about 100 parts by volume of resin of hollow discrete microspheres with alkalinity no greater than about 0.5 milliequivalents per grams, the diameter ranging from about 1 to about 300 microns and a wall thickness of not in excess of about 5 microns.
Claim 12
Dependent Claim
96 words
A sealing gasket having uniform void volume comprised of a plastisol comprised of about 5 to about 150 parts by weight of plasticizer per 100 parts by weight of resin wherein at least about 70 percent of said resin is formed by dispersion polymerization said plastisol having incorporated therein and about 5 to about 100 parts by volume of resin of hollow discrete microspheres with alkalinity no greater than about 0.5 milliequivalents per grams, the diameter ranging from about 1 to about 300 microns and a wall thickness of not in excess of about 5 microns.
Claim 13
Dependent Claim
22 words
The sealing gasket of claim 9 further comprising about 0.1 to about 10 parts by weight of at least one separation inhibitor.
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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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |