Patent US3984342A successfully refreshed from Google Patents.
US3984342A
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Process for agglomerating sodium carbonate peroxide
Assignee: FMC Corp
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Filing: 1974-10-15
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Granted: 1976-10-05
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Expires: 1994-10-15
Abstract
Abstract Strong, stable, free-flowing agglomerates of sodium carbonate peroxide are produced by contacting rotary agitated sodium carbonate peroxide with an aqueous agglomerating solution having a viscosity of at least 30 centipoise and containing less than 20% by weight agglomerating agent.
Inventors
- 👤 Richard E. Hall
- 👤 Sushil K. Bhalla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:36
CPC Classifications
C; C11; C11D; C11D17/00; C11D17/0039; B; B01; B01J; B01J2/00; B01J2/14; B01J2/28; C01; C01B; C01B15/00; C01B15/055; C01B15/10; C01B15/106; C11D3/00; C11D3/39; C11D3/3942
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
A process for producing strong, stable, free-flowing agglomerates of sodium carbonate peroxide, which comprises: subjecting particles of sodium carbonate peroxide having a size below about 50 mesh to rotary agitation; contacting the rotating particles with an aqueous agglomerating solution having a viscosity of at least 30 centipoise and containing less than 20% by weight agglomerating agent selected from the group consisting of salts of carboxymethylcellulose; interpolymer of methyl vinyl ether and maleic anhydride; crosslinked or esterfied interpolymer of methyl vinyl ether and maleic anhydride; polyvinylpyrollidone; crosslinked or comonomers of polyvinylpyrollidone; guar gum; crosslinked or substituted guar gum; and carboxypolymethylenes; continuing the rotary agitation of the resultant wet particles until they become agglomerated; drying the resulting wet agglomerated particles at temperatures from about 20°C to about 150°C; and recovering dry agglomerated particles of sodium carbonate peroxide having bulk densities of about 0.4 to about 1.0 g/cc and at least 70% particle sizes of about 16 to about 50 mesh.
Claim 2
Dependent Claim
158 words
A process for producing strong, stable, free-flowing agglomerates of sodium carbonate peroxide, which comprises: subjecting particles of sodium carbonate peroxide having a size below about 50 mesh to rotary agitation; contacting the rotating particles with an aqueous agglomerating solution having a viscosity of at least 30 centipoise and containing less than 20% by weight agglomerating agent selected from the group consisting of salts of carboxymethylcellulose; interpolymer of methyl vinyl ether and maleic anhydride; crosslinked or esterfied interpolymer of methyl vinyl ether and maleic anhydride; polyvinylpyrollidone; crosslinked or comonomers of polyvinylpyrollidone; guar gum; crosslinked or substituted guar gum; and carboxypolymethylenes; continuing the rotary agitation of the resultant wet particles until they become agglomerated; drying the resulting wet agglomerated particles at temperatures from about 20°C to about 150°C; and recovering dry agglomerated particles of sodium carbonate peroxide having bulk densities of about 0.4 to about 1.0 g/cc and at least 70% particle sizes of about 16 to about 50 mesh.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein the aqueous agglomerating solution contains less than about 5% by weight agglomerating agent and has a viscosity between about 30 and about 200 centipoise.
Claim 4
Dependent Claim
30 words
The process of claim 1 wherein the aqueous agglomerating solution contains less than about 2% by weight agglomerating agent and has a viscosity between about 55 and about 85 centipoise.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the aqueous agglomerating solution is sprayed onto the rotating sodium carbonate peroxide particles.
Claim 6
Dependent Claim
31 words
The process of claim 1 wherein the agglomerating agent is selected from a material consisting of sodium carboxymethylcellulose, interpolymer of methyl vinyl ether and maleic anhydride, polyvinylpyrrolidone, guar gum and carboxypolymethylene.
Claim 7
Dependent Claim
137 words
A process for producing strong, stable, free-flowing agglomerates of sodium carbonate peroxide, which comprises: subjecting particles of sodium carbonate peroxide having a size below about 50 mesh to rotary agitation; contacting the rotating particles with an aqueous agglomerating solution having a viscosity between about 30 and about 200 centipoise and containing less than 20% by weight agglomerating agent selected from a material consisting of sodium carboxymethylcellulose, interpolymer of methyl vinyl ether and maleic anhydride, polyvinylpyrrolidone, guar gum and carboxypolymethylene; continuing the rotary agitation of the resultant wet particles until they become agglomerated; drying the resulting wet agglomerated particles at temperatures from about 20° to 150°C; and recovering dry agglomerated particles of sodium carbonate peroxide having bulk densities of about 0.4 to about 1.0 g/cc and at least 70% particle sizes of about 16 to about 50 mesh.
Claim 8
Dependent Claim
137 words
A process for producing strong, stable, free-flowing agglomerates of sodium carbonate peroxide, which comprises: subjecting particles of sodium carbonate peroxide having a size below about 50 mesh to rotary agitation; contacting the rotating particles with an aqueous agglomerating solution having a viscosity between about 30 and about 200 centipoise and containing less than 20% by weight agglomerating agent selected from a material consisting of sodium carboxymethylcellulose, interpolymer of methyl vinyl ether and maleic anhydride, polyvinylpyrrolidone, guar gum and carboxypolymethylene; continuing the rotary agitation of the resultant wet particles until they become agglomerated; drying the resulting wet agglomerated particles at temperatures from about 20° to 150°C; and recovering dry agglomerated particles of sodium carbonate peroxide having bulk densities of about 0.4 to about 1.0 g/cc and at least 70% particle sizes of about 16 to about 50 mesh.
Claim 9
Dependent Claim
69 words
A strong, stable free-flowing agglomerated sodium carbonate peroxide composition which comprises sodium carbonate peroxide and about 0.01 to about 3.0% by weight agglomerating agent selected from a material consisting of sodium carboxymethylcellulose, interpolymer of methyl vinyl ether and maleic anhydride, polyvinylpyrrolidone, guar gum and carboxypolymethylene and having a bulk density of about 0.4to about 1.0 g/cc and at least 70% particle sizes of about 16 to about 50 mesh.
Claim 10
Dependent Claim
69 words
A strong, stable free-flowing agglomerated sodium carbonate peroxide composition which comprises sodium carbonate peroxide and about 0.01 to about 3.0% by weight agglomerating agent selected from a material consisting of sodium carboxymethylcellulose, interpolymer of methyl vinyl ether and maleic anhydride, polyvinylpyrrolidone, guar gum and carboxypolymethylene and having a bulk density of about 0.4to about 1.0 g/cc and at least 70% particle sizes of about 16 to about 50 mesh.
Claim 11
Dependent Claim
28 words
The composition of claim 7 which comprises particles having a bulk density of about 0.8 to about 1.0 g/cc and about 0.01 to about 3.0% by weight carboxymethylcellulose.
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) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |