US4011179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous sulfur foam preparation using polyisocyanates
Assignee: Chevron USA Inc
•
Filing: 1975-02-07
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Granted: 1977-03-08
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Expires: 1995-02-07
Abstract
Abstract A process for the production of sulfur foam containing at least 50 weight percent sulfur, which comprises: A. heating sulfur in a first zone to a temperature above about 100° C to obtain molten sulfur and reacting the molten sulfur with an organic protonic acid which is reactive with molten sulfur so as to incorporate the organic acid with sulfur to form a sulfur-organic acid adduct containing unreacted protonic acid groups; B. passing said sulfur adduct in liquid state out of said first zone and into a separate mixer; and C. mixing and reacting in said mixer a polyisocyanate with the unreacted acid groups of said sulfur adduct to thereby, upon removal of the polyisocyanate-acid group reaction product from the mixer, release gas and generate a foam. Preferably the sulfur adduct is formed by reacting sulfur with a plasticizer as well as the acid. The plasticization resulting from phenol reacting with sulfur is particularly preferred, and preferably the liquid phenolmodified sulfur-acid adduct is reacted with polyisocyanate in the mixer within a residence time of 0.1 to 3.0 seconds and within a temperature range of 110° to 140° C.
Inventors
- 👤 Gar Lok Woo
- 👤 John M. Dale
- 👤 Allen C. Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:54
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/461; C; C01; C01B; C01B17/00; C01B17/02; C01B17/0243
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
129 words
A process for the production of sulfur foam containing at least 50 weight percent sulfur, which consists essentially of: a. heating sulfur in a first zone to a temperature above about 100° C to obtain molten sulfur and reacting the molten sulfur with an organic protonic acid which is reactive with molten sulfur so as to incorporate the organic acid with sulfur to form a sulfur-organic acid adduct containing unreacted protonic acid groups; b. passing said sulfur adduct in liquid state out of said first zone and into a separate mixer; and c. mixing and reacting in said mixer a polyisocyanate with the unreacted acid groups of said sulfur adduct to thereby, upon removal of the polyisocyanate-acid group reaction product from the mixer, release gas and generate a foam.
Claim 2
Dependent Claim
129 words
A process for the production of sulfur foam containing at least 50 weight percent sulfur, which consists essentially of: a. heating sulfur in a first zone to a temperature above about 100° C to obtain molten sulfur and reacting the molten sulfur with an organic protonic acid which is reactive with molten sulfur so as to incorporate the organic acid with sulfur to form a sulfur-organic acid adduct containing unreacted protonic acid groups; b. passing said sulfur adduct in liquid state out of said first zone and into a separate mixer; and c. mixing and reacting in said mixer a polyisocyanate with the unreacted acid groups of said sulfur adduct to thereby, upon removal of the polyisocyanate-acid group reaction product from the mixer, release gas and generate a foam.
Claim 3
Dependent Claim
14 words
A process in accordance with claim 1 wherein the acid is a carboxylic acid.
Claim 4
Dependent Claim
22 words
A process in accordance with claim 1 wherein the organic acid is an unsaturated acid, a dithio acid, or a mercapto acid.
Claim 5
Dependent Claim
24 words
A process in accordance with claim 1 wherein the organic acid is an unsaturated aliphatic carboxylic acid containing from 3 to 30 carbon atoms.
Claim 6
Dependent Claim
14 words
A process in accordance with claim 1 wherein the organic acid is acrylic acid.
Claim 7
Dependent Claim
20 words
A process in accordance with claim 1 wherein the polyisocyanate is an aryl isocyanate containing 2 or 3 isocyanate groups.
Claim 8
Dependent Claim
127 words
A process for the production of sulfur foam containing at least 50 weight percent sulfur, which consists essentially of: a. heating sulfur in a first zone to a temperature above about 100° C to obtain molten sulfur and reacting the molten sulfur with a plasticizer and an organic protonic acid which are reactive with sulfur to thereby obtain a modified sulfur-organic acid adduct containing unreacted protonic acid groups; b. passing said modified sulfur-organic acid adduct in liquid state out of said first zone into a separate mixer; and c. mixing and reacting in said mixer a polyisocyanate with the unreacted acid groups of said modified sulfur-organic acid adduct to thereby, upon removal of the polyisocyanate-acid group reaction product from the mixer, release gas and generate a foam.
Claim 9
Dependent Claim
127 words
A process for the production of sulfur foam containing at least 50 weight percent sulfur, which consists essentially of: a. heating sulfur in a first zone to a temperature above about 100° C to obtain molten sulfur and reacting the molten sulfur with a plasticizer and an organic protonic acid which are reactive with sulfur to thereby obtain a modified sulfur-organic acid adduct containing unreacted protonic acid groups; b. passing said modified sulfur-organic acid adduct in liquid state out of said first zone into a separate mixer; and c. mixing and reacting in said mixer a polyisocyanate with the unreacted acid groups of said modified sulfur-organic acid adduct to thereby, upon removal of the polyisocyanate-acid group reaction product from the mixer, release gas and generate a foam.
Claim 10
Dependent Claim
15 words
A process in accordance with claim 7 wherein the organic acid is a carboxylic acid.
Claim 11
Dependent Claim
14 words
A process in accordance with claim 7 wherein the organic acid is acrylic acid.
Claim 12
Dependent Claim
12 words
A process in accordance with claim 9 wherein the plasticizer is phenol.
Claim 13
Dependent Claim
20 words
A process in accordance with claim 10 wherein the residence time in said mixer is between 0.01 and 10 seconds.
Claim 14
Dependent Claim
20 words
A process in accordance with claim 10 wherein the residence time in said mixer is between 0.1 and 3.0 seconds.
Claim 15
Dependent Claim
20 words
A process in accordance with claim 11 wherein the temperature maintained in said mixer is between 100° and 160° C.
Claim 16
Dependent Claim
20 words
A process in accordance with claim 11 wherein the temperature maintained in said mixer is between 100° and 140° C.
Claim 17
Dependent Claim
20 words
A process in accordance with claim 11 wherein the temperature maintained in said mixer is between 115° and 125° C.
References Cited (Backward Citations)
US3892686A
Cited
US3954685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |