US4391969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified sulfur cement
Assignee: COMMERCE United States, AS REPRESENTED BY DEPARTMENT OF
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Filing: 1981-05-22
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Granted: 1983-07-05
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Expires: 2001-05-22
Abstract
Abstract A modified sulfur cement formulation, comprising the polymeric reaction product of sulfur with a cyclopentadiene oligomer-dicyclopentadiene containing modifier in which the cyclopentadiene oligomer content of said modifier is at least 37 wt. %, the sulfur cement product having a softening point ranging up to 116 DEG C.
Inventors
- 👤 William C. McBee
- 👤 Thomas A. Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:21
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/36; C08; C08G; C08G75/00; C08G75/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
A modified sulfur cement formulation, consisting essentially of: the polymeric reaction product of sulfur with from 2 to 20 wt. % of a cyclopentadiene oligomer mixture-dicyclopentadiene containing modifier, said cyclopentadiene oligomer mixture being free of dicyclopentadiene, wherein the cyclopentadiene oligomer mixture content of said modifier is at least 37 wt. %, said sulfur cement product having a softening point ranging up to 116° C.
Claim 2
Dependent Claim
64 words
A modified sulfur cement formulation, consisting essentially of: the polymeric reaction product of sulfur with from 2 to 20 wt. % of a cyclopentadiene oligomer mixture-dicyclopentadiene containing modifier, said cyclopentadiene oligomer mixture being free of dicyclopentadiene, wherein the cyclopentadiene oligomer mixture content of said modifier is at least 37 wt. %, said sulfur cement product having a softening point ranging up to 116° C.
Claim 3
Dependent Claim
23 words
The formulation of claim 1, wherein the content of said oligomer in said modifier ranges from 37 wt. % to 75 wt. %.
Claim 4
Dependent Claim
22 words
The formulation of claim 1, wherein from 2 to 10 wt. % modifier is combined with 98 to 90 wt. % sulfur.
Claim 5
Dependent Claim
29 words
The formulation of claim 1, wherein the sulfur-modifier mixture during the reaction leading to said cement product has a viscosity of up to about 180 cp at 135° C.
Claim 6
Dependent Claim
14 words
The formulation of claim 4, wherein said viscosity ranges from 25 to 180 cp.
Claim 7
Dependent Claim
29 words
The formulation of claim 4, wherein when said modifier ranges in concentration between 10% and 20%, at least 60 wt % of said modifier must be said oligomer component.
Claim 8
Independent Claim
75 words
A method of preparing a hot modified sulfur cement ready for casting, comprising: reacting sulfur with from 2 up to but not including 20 wt. % of a cyclopentadiene oligomer mixture-dicyclopentadiene containing modifier, said oligomer mixture being free of dicyclopentadiene, in which the cyclopentadiene oligomer content of said modifier is at least 37 wt. %, the mixture of sulfur and modifier during the reaction exhibiting a viscosity at 135° C. up to about 180 cp.
Claim 9
Independent Claim
75 words
A method of preparing a hot modified sulfur cement ready for casting, comprising: reacting sulfur with from 2 up to but not including 20 wt. % of a cyclopentadiene oligomer mixture-dicyclopentadiene containing modifier, said oligomer mixture being free of dicyclopentadiene, in which the cyclopentadiene oligomer content of said modifier is at least 37 wt. %, the mixture of sulfur and modifier during the reaction exhibiting a viscosity at 135° C. up to about 180 cp.
Claim 10
Dependent Claim
16 words
The method of claim 7, wherein said elevated temperature ranges from 115° C. to 160° C.
References Cited (Backward Citations)
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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) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |