US4508569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing compound for cans
Assignee: Toyo Seikan Group Holdings Ltd
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Filing: 1983-10-06
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Granted: 1985-04-02
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Expires: 2003-10-06
Abstract
Abstract Disclosed is a sealing compound for cans, which is applied to the periphery of a can end member to seal the double-seamed portion between the can end member and a can body, said sealing compound comprising as a base component an aqueous latex of a styrene-butadiene rubber containing as a particle size-adjusting agent an alkali metal carbonate or an alkali metal salt of a phosphorus oxyacid in an amount of 0.3 to 2.0 parts by weight per 100 parts by weight of solids of the styrene-butadiene rubber.
Inventors
- 👤 Hideo Kumasaka
- 👤 Kazuo Fujisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:08
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/10; C08; C08L; C08L9/00; C08L9/06; C08L9/08; C09K2200/00; C09K2200/02; C09K2200/0217; C09K2200/0234; C09K2200/0239; C09K2200/0243; C09K2200/0252; C09K2200/04; C09K2200/0447; C09K2200/06; C09K2200/0602; C09K2200/0607; C09K2200/0687
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
146 words
In a can end formed from a surface-treated steel plate having an annular groove at the periphery thereof which comprises a gasket layer formed in the annular groove to seal the double-seamed portion between the can end and a can body, the improvement wherein said gasket layer is formed by lining a sealing compound in the annular groove, said sealing compound comprising as a base component an aqueous latex of a styrene-butadiene rubber which contains styrene and butadiene at a weight ratio of from 28/72 to 55/45, said latex containing as a particle size-adjusting agent an alkali metal carbonate or an alkali metal salt of a phosphorus oxyacid in an amount of 0.3 to 2.0 parts by weight per 100 parts by weight of solids of the styrene-butadiene rubber wherein the number average particle size of particles of the styrene-butadiene rubber is 1,600 to 3,000 Å.
Claim 2
Dependent Claim
146 words
In a can end formed from a surface-treated steel plate having an annular groove at the periphery thereof which comprises a gasket layer formed in the annular groove to seal the double-seamed portion between the can end and a can body, the improvement wherein said gasket layer is formed by lining a sealing compound in the annular groove, said sealing compound comprising as a base component an aqueous latex of a styrene-butadiene rubber which contains styrene and butadiene at a weight ratio of from 28/72 to 55/45, said latex containing as a particle size-adjusting agent an alkali metal carbonate or an alkali metal salt of a phosphorus oxyacid in an amount of 0.3 to 2.0 parts by weight per 100 parts by weight of solids of the styrene-butadiene rubber wherein the number average particle size of particles of the styrene-butadiene rubber is 1,600 to 3,000 Å.
Claim 3
Dependent Claim
48 words
The can end as set forth in claim 1 wherein said latex comprises styrene-butadiene rubber particles obtained by emulsion-polymerizing styrene and butadiene at a temperature of 35° to 70° C. in an aqueous medium containing the alkali metal carbonate or the alkali metal salt of the phosphorus oxyacid.
Claim 4
Dependent Claim
37 words
The can end as set forth in claim 2 wherein said latex contains the styrene-butadiene rubber particles at a solid concentration of 30 to 90% by weight and has a pH value of from 9.5 to 10.5.
Claim 5
Dependent Claim
43 words
The can end as set forth in claim 1 wherein the sealing compound further comprises a thickener composed of a water-soluble polymer in an amount of 2 to 12 parts by weight per 100 parts by weight of solids of the styrene-butadiene rubber.
Claim 6
Dependent Claim
70 words
The can end as set forth in claim 1 or claim 4 in which the sealing compound further comprises a tackifier in an amount of 5 to 200 parts by weight, a filler in an amount of 30 to 200 parts by weight and an emulsifier or a dispersant in an amount of 3.5 to 9.5 parts by weight per 100 parts by weight of solids of the styrene-butadiene rubber.
Claim 7
Dependent Claim
19 words
The can end as set forth in claim 1 wherein the particle size-adjusting agent is said alkali metal carbonate.
Claim 8
Dependent Claim
23 words
The can end as set forth in claim 1 wherein said particle size-adjusting agent is said alkali metal salt of a phosphorus oxyacid.
Claim 9
Independent Claim
157 words
A method for preventing rusting on the cut edge of a can end formed from a surfacetreated steel plate having an annular groove at the periphery thereof which comprises lining a sealing compound comprising as a base component an aqueous latex of a styrene-butadiene rubber which contains styrene and butadiene at a weight ratio of from 28/72 to 55/45, said latex containing as a particle size-adjusting agent an alkali metal carbonate or an alkali metal salt of a phosphorus oxyacid in an amount of 0.3 to 2.0 parts by weight per 100 parts by weight of solids of the styrene-butadiene rubber wherein the number average particle size of particles of the styrene-butadiene rubber is 1,600 to 3,000 Å in the annular groove and double-seaming the can end member to a can body whereby the sealing compound forms a gasket layer in the annular groove to seal the double-seamed portion between the can end and the can body.
Claim 10
Independent Claim
157 words
A method for preventing rusting on the cut edge of a can end formed from a surfacetreated steel plate having an annular groove at the periphery thereof which comprises lining a sealing compound comprising as a base component an aqueous latex of a styrene-butadiene rubber which contains styrene and butadiene at a weight ratio of from 28/72 to 55/45, said latex containing as a particle size-adjusting agent an alkali metal carbonate or an alkali metal salt of a phosphorus oxyacid in an amount of 0.3 to 2.0 parts by weight per 100 parts by weight of solids of the styrene-butadiene rubber wherein the number average particle size of particles of the styrene-butadiene rubber is 1,600 to 3,000 Å in the annular groove and double-seaming the can end member to a can body whereby the sealing compound forms a gasket layer in the annular groove to seal the double-seamed portion between the can end and the can body.
Claim 11
Dependent Claim
79 words
The method of claim 8 wherein the sealing compound further comprises a thickener composed of a watersoluble polymer in an amount of 2 to 12 parts by weight, a tackifier in an amount of 5 to 200 parts by weight, a filler in an amount of 30 to 200 parts by weight and an emulsifier or a dispersant in an amount of 3.5 to 9.5 parts by weight, per 100 parts by weight of solids of the styrene-butadiene rubber.
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) | 1988-04-01 | 1988-10-01 | 1989-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-01 | 1992-10-01 | 1993-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-01 | 1996-10-01 | 1997-04-02 | $7700.00 | Window Closed / Lapsed |