US4140619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wax treating process
Assignee: Shell USA Inc
•
Filing: 1977-09-26
•
Granted: 1979-02-20
•
Expires: 1997-09-26
Abstract
Abstract The molecular weight of a solid paraffin wax having an oil content of no more than about 2% by weight is increased by contacting the wax at elevated temperature with at least about 5% by weight of an organic peroxide.
Inventors
- 👤 Anton VAN DER Wiel
- 👤 Bernardus C. Ernsting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:37
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/36; C10G73/38
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
A process for increasing the molecular weight of a paraffin wax without decreasing the setting point of the wax more than 5° C. by first contacting a solid paraffin wax having an oil content of no more than about 2% by weight at an elevated temperature with at least 5% by weight of an organic peroxide to produce a crude reaction mixture comprising a paraffin wax of increased molecular weight and peroxide decomposition products and subsequently separating the wax of increased molecular weight from the peroxide decomposition products by evaporation or fractional crystallization.
Claim 2
Dependent Claim
93 words
A process for increasing the molecular weight of a paraffin wax without decreasing the setting point of the wax more than 5° C. by first contacting a solid paraffin wax having an oil content of no more than about 2% by weight at an elevated temperature with at least 5% by weight of an organic peroxide to produce a crude reaction mixture comprising a paraffin wax of increased molecular weight and peroxide decomposition products and subsequently separating the wax of increased molecular weight from the peroxide decomposition products by evaporation or fractional crystallization.
Claim 3
Dependent Claim
43 words
The process of claim 1 wherein said wax is contacted at a temperature from about 100° C. to about 225° C. with an organic peroxide of the formula R--O--O--R wherein R independently is alkyl, acyl or aryl of up to 10 carbon atoms.
Claim 4
Dependent Claim
10 words
The process of claim 2 wherein each R is tert-alkyl.
Claim 5
Dependent Claim
10 words
The process of claim 3 wherein each R is tert-butyl.
Claim 6
Dependent Claim
94 words
A process for increasing the molecular weight of a paraffin wax without decreasing the setting point of the wax more than 5° C. by first contacting a solid paraffin wax having an oil content of no more than about 2% by weight at an elevated temperature with between 10% and 30% by weight of an organic peroxide to produce a crude reaction mixture comprising a paraffin wax of increased molecular weight and peroxide decomposition products and subsequently separating the wax of increased molecular weight from the peroxide decomposition products by evaporation or fractional crystallization.
Claim 7
Dependent Claim
94 words
A process for increasing the molecular weight of a paraffin wax without decreasing the setting point of the wax more than 5° C. by first contacting a solid paraffin wax having an oil content of no more than about 2% by weight at an elevated temperature with between 10% and 30% by weight of an organic peroxide to produce a crude reaction mixture comprising a paraffin wax of increased molecular weight and peroxide decomposition products and subsequently separating the wax of increased molecular weight from the peroxide decomposition products by evaporation or fractional crystallization.
Claim 8
Dependent Claim
43 words
The process of claim 5 wherein said wax is contacted at a temperature from about 100° C. to about 225° C. with an organic peroxide of the formula R--O--O--R wherein R independently is alkyl, acyl or aryl of up to 10 carbon atoms.
Claim 9
Dependent Claim
10 words
The process of claim 6 wherein each R is tert-alkyl.
Claim 10
Dependent Claim
10 words
The process of claim 7 wherein each R is tert-butyl.
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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |