US4072531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plugging compositions for blast furnace tap holes
Assignee: Sumitomo Durez Co Ltd
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Filing: 1976-03-12
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Granted: 1978-02-07
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Expires: 1996-03-12
Abstract
Abstract Plugging compositions for blast furnace tap holes comprising a refractory filler, a wetting agent, and a binder therefor comprising a phenol-aldehyde condensate resin chemically modified by reaction with lignin have a muddy consistancy, and are characterized by enhanced compressive strength at elevated temperatures and increased plasticity at low temperatures as compared to conventional binders.
Inventors
- 👤 Kyohei Funabiki
- 👤 Tetsuya Tokunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:34
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/12; C21B7/125; C08; C08G; C08G8/00; C08G8/28; C08K; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
A blast furnace tap hole plugging composition comprising a condensate resin of a phenol and an aldehyde chemically modified by reaction under heating with a lignin selected from the group consisting of sulfite pulp lignin and kraft pulp lignin, present in an amount of about 5 to about 500 parts by weight per 100 parts by weight of phenol, a refractory filler, and a wetting agent present in an amount of from about 0.5 to about 20 parts by weight per 100 parts by weight of refractory filler, wherein the resin is present in a range of about 5 to about 30 parts by weight per 100 parts by weight of refractory filler.
Claim 2
Dependent Claim
113 words
A blast furnace tap hole plugging composition comprising a condensate resin of a phenol and an aldehyde chemically modified by reaction under heating with a lignin selected from the group consisting of sulfite pulp lignin and kraft pulp lignin, present in an amount of about 5 to about 500 parts by weight per 100 parts by weight of phenol, a refractory filler, and a wetting agent present in an amount of from about 0.5 to about 20 parts by weight per 100 parts by weight of refractory filler, wherein the resin is present in a range of about 5 to about 30 parts by weight per 100 parts by weight of refractory filler.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein the condensate resin is novolak resin.
Claim 4
Dependent Claim
13 words
The composition of claim 1 wherein the condensate resin is a resol resin.
Claim 5
Dependent Claim
36 words
The composition of claim 1 wherein the aldehyde reactant is formaldehyde and the phenol reactant is selected from the group consisting of phenol and alkyl phenols having 1 to 4 carbon atoms in the alkyl substituent.
Claim 6
Dependent Claim
22 words
The composition of claim 1 wherein the refractory filler is selected from the group consisting of clay, alumina, carbon, magnesia, and pyrophyllites.
Claim 7
Dependent Claim
29 words
The composition of claim 1 wherein the wetting agent is selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, polyethylene glycol, dioctyl phthalate, and tricresyl phosphate.
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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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |