US4529132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing free-flowing ethylene homopolymers or copolymer waxes
Assignee: Ruhrchemie AG
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Filing: 1982-09-29
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Granted: 1985-07-16
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Expires: 2002-09-29
Abstract
Abstract The invention relates to the preparation of free-flowing homopolymer and copolymer waxes by heating the solid or molten waxes in aqueous ammonia solution.
Inventors
- 👤 John Hobes
- 👤 Detlef Deymann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:44
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/16; C08J2323/00; C08J2323/02; C08J2323/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
75 words
A process for the preparation of a free-flowing, particulate ethylene wax having a melting pointing range, said wax being selected from the group consisting of ethylene homopolymer and copolymer waxes, comprising (a) suspending said wax in an aqueous ammonia solution, (b) then heating said wax in said solution to a temperature just below said melting point range while stirring, and (c) further stirring while continuing said heating, wherein said wax is in a solid state.
Claim 2
Dependent Claim
75 words
A process for the preparation of a free-flowing, particulate ethylene wax having a melting pointing range, said wax being selected from the group consisting of ethylene homopolymer and copolymer waxes, comprising (a) suspending said wax in an aqueous ammonia solution, (b) then heating said wax in said solution to a temperature just below said melting point range while stirring, and (c) further stirring while continuing said heating, wherein said wax is in a solid state.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said ammonia solution contains 0.1 to 1% by weight of emulsifier based on said solution.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein said temperature is about 2° to about 10° C. below said melting point range.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein said further stirring is continued until said wax has been broken down into fine particles.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein, after said further stirring, said suspension is cooled to room temperature.
Claim 7
Dependent Claim
12 words
The process of claim 5 wherein said suspension is cooled with stirring.
Claim 8
Dependent Claim
15 words
The process of claim 5 wherein said wax is filtered out of the cooled suspension.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein, after said further stirring, said suspension is added to cold water while stirring.
Claim 10
Dependent Claim
13 words
The process of claim 8 wherein talcum is added to said cold water.
Claim 11
Dependent Claim
24 words
The process of claim 9 wherein 0.1 to 0.5% by weight of said talcum based on the water is added to said cold water.
Claim 12
Dependent Claim
16 words
The process of claim 1 wherein, after said further stirring, said suspension is washed and dried.
Claim 13
Dependent Claim
14 words
The process of claim 11 wherein said suspension is washed with water containing talcum.
Claim 14
Dependent Claim
18 words
The process of claim 1 wherein said further stirring takes place for about 10 minutes to 3 hours.
Claim 15
Dependent Claim
36 words
The process of claim 1 wherein said suspension is stirred for about 1 hour at a lower temperature and then stirred for about an additional 2 hours at said temperature just below the melting point range.
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) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |