US4820876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene wax
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1987-05-27
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Granted: 1989-04-11
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Expires: 2007-05-27
Abstract
Abstract Synthetic polyethylene wax having low molecular weight of 250 to 3000 and a density of 0.930 to 0.950 is prepared in a high pressure process at pressures of at least 800 bar using a carbonyl compound such as acetaldehyde as chain transfer agent. The resulting wax with incorporated CO has good compatibility in hot melt systems, and may be stripped to remove light ends, increase density and crystallinity and improve thermal stability.
Inventors
- 👤 Hugo J. C. Nuttens
- 👤 Gerard Van Haeren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:28
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
52 words
A polyethylene wax having mn of 250 to 3,000 as measured by gel permeation chromatography, a density of 0.930 to 0.960, a viscosity of 10 to 100 mPa.s measured at 121 degrees C. and a degree of CO incorporation of 0.2 to 12 wt.% CO as measured by elemental analysis of oxygen.
Claim 2
Dependent Claim
52 words
A polyethylene wax having mn of 250 to 3,000 as measured by gel permeation chromatography, a density of 0.930 to 0.960, a viscosity of 10 to 100 mPa.s measured at 121 degrees C. and a degree of CO incorporation of 0.2 to 12 wt.% CO as measured by elemental analysis of oxygen.
Claim 3
Dependent Claim
20 words
A polyethylene wax as claimed in claim 1, having a degree of CO incorporation of 0.2 to 10 wt.% CO.
Claim 4
Dependent Claim
20 words
A polyethylene wax as claimed in claim 2 having a degree of CO incorporation of 2 to 6 wt% CO.
Claim 5
Dependent Claim
16 words
A wax as claimed in claim 1, which has a viscosity of 15 to 50 mPa.s.
Claim 6
Dependent Claim
22 words
A wax of claim 1, which has a melt peak temperature (MPT) as measured by differential scanning calorimetry greater than 95° C.
Claim 7
Dependent Claim
16 words
A wax as claimed in claim 5, which as a MPT of greater than 100° C.
Claim 8
Dependent Claim
17 words
A wax of claim 5, which has a Shore hardness A after 15 seconds greater than 30.
Claim 9
Dependent Claim
16 words
A wax as claimed in claim 7, which has a Shore hardness A greater than 50.
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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |