Patent US3721658A successfully refreshed from Google Patents.
US3721658A
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US
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Method of preparing high softening point thermoplastics
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-05-03
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Granted: 1973-03-20
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Expires: 1991-05-03
Abstract
Abstract High softening point thermoplastic materials are prepared by the contacting of steam-cracked tar or fractions thereof with oxygen containing gases in the presence of a catalyst comprising salts of iron, copper, aluminum and zinc. The product materials result from the oxidative polymerization which occurs at temperatures in the range of 200* to 300* C. and are useful binder materials for the manufacture of fiberboard and other products.
Inventors
- 👤 G Dickakian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:50
CPC Classifications
C; C08; C08G; C08G61/00; C10; C10C; C10C3/00; C10C3/02; C10C3/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
24 words
Process according to claim 1, wherein the reaction is carried out until 0.5 to 2.5 wt percent of oxygen is introduced in the tar.
Claim 2
Dependent Claim
17 words
Process according to claim 1, wherein air is injected at a rate of 0.35 - 3 cc/minutes/gm.
Claim 3
Dependent Claim
71 words
Process according to claim 1, wherein the steam-cracked tar to be polymerized is derived from gas oil/naphtha mixtures, said tar having the following characteristics: Specific Gravity 0.90-1.20 Viscosity cs at 100* F (38* C) 42-5000 cs at 210* F (94* C) 4.0-36.0 Carbon Conradson wt % 2.0-30.0 Number Average Molecular Weight Mn 175-400 Sulfur Content wt % 0.1-4.0 Asphaltene (Heptane-insoluble wt % 2-35 Softening Point (Ring and Ball) * C 5-40
Claim 4
Dependent Claim
20 words
Process according to claim 1, wherein the high boiling pitch fraction of the tar (b.p. 480* C ) is polymerized.
Claim 5
Dependent Claim
16 words
Process according to claim 1, wherein combinations of the whole tar and fractions thereof are polymerized.
Claim 6
Dependent Claim
20 words
Process according to claim 1, wherein a middle fraction of the tar with b.p. 370* - 480* C is polymerized.
Claim 7
Dependent Claim
11 words
Process according to claim 1, wherein the catalyst is ferric chloride.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |