Patent US3901859A successfully refreshed from Google Patents.
US3901859A
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Process for preventing discoloration of olefinic polymers containing vanadium catalyst residues
Assignee: Covestro International SA
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Filing: 1974-01-04
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Granted: 1975-08-26
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Expires: 1994-01-04
Abstract
Abstract The discoloration of olefinic polymers containing vanadium catalyst residues is prevented or held to a minimum even after long periods of storage by adding to such polymers a small amount of certain polycarboxylic acids and salts, polyalcohols, oxyacids and their salts, hydroxyl amine and boric acid.
Inventors
- 👤 Alberto Alberti
- 👤 Sergio Bacciarelli
- 👤 Giuliano Ballini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:47
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/38; C08F; C08F6/00; C08F6/02; C08K5/00; C08K5/0008; C08K5/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A PROCESS FOR PREVENTING THE DISCOLORING OF OLEFINIC POLYMERS CONTAINING GREATER THAN ABBOUT 20 PARTS PER MILLION OF VANADIUM CATALYST RESIDUE COMPRISING ADDING TO SAID POLYMERS IN A SOLID STATE, IN THE SUBSTANTIAL ABSENCE OF LIQUIDS, AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF (1) POLYCARBOXYLIC ACIDS AND SALTS THEREOF, AND (2) POLYALCOHOLS, SAID POLYCARBOXYLIC ACIDS AND POLYACOHOLS CONTAINING 2 TO 8 CARBON ATOMS AND AT LEAST TWO HYDROXYL OR TWO CARBOXYL GROUPS WITH A TOTAL OF THREE SUCH GROUPS, (3) HYDROXYLAMINE AND (4) BORIC ACID.
Claim 2
Dependent Claim
88 words
A PROCESS FOR PREVENTING THE DISCOLORING OF OLEFINIC POLYMERS CONTAINING GREATER THAN ABBOUT 20 PARTS PER MILLION OF VANADIUM CATALYST RESIDUE COMPRISING ADDING TO SAID POLYMERS IN A SOLID STATE, IN THE SUBSTANTIAL ABSENCE OF LIQUIDS, AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF (1) POLYCARBOXYLIC ACIDS AND SALTS THEREOF, AND (2) POLYALCOHOLS, SAID POLYCARBOXYLIC ACIDS AND POLYACOHOLS CONTAINING 2 TO 8 CARBON ATOMS AND AT LEAST TWO HYDROXYL OR TWO CARBOXYL GROUPS WITH A TOTAL OF THREE SUCH GROUPS, (3) HYDROXYLAMINE AND (4) BORIC ACID.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein the amount of said compound is from about 0.05 to 10 parts by weight per 100 weight parts of polymer.
Claim 4
Dependent Claim
22 words
The process of claim 2 wherein the polymer and compound are mixed together at temperatures ranging from about 80*C. to about 200*C.
Claim 5
Dependent Claim
43 words
The process of claim 3 wherein the additive is mixed with the polymer while the polymer is being dried in amount from about 0.1 to 1 weight part of compound, and wherein the polycarboxylic acid or polyalcohol contains 4 to 6 carbon atoms.
Claim 6
Dependent Claim
36 words
The process of claim 4 wherein said vanadium residue is a vanadium chloride and the polymer is a copolymer containing 20 to 80 percent ethylene, 0.1 to 20 percent by weight of a polyene and propylene.
Claim 7
Dependent Claim
10 words
The process of claim 5 wherein said polyene is 5-ethylidene-norbornene-2.
Claim 8
Dependent Claim
11 words
The process of claim 6 wherein said additive is tartaric acid.
Claim 9
Dependent Claim
10 words
The process of claim 6 wherein said additive is glycerol.
Claim 10
Dependent Claim
11 words
The process of claim 6 wherein said additive is citric acid.
Claim 11
Dependent Claim
11 words
The process of claim 6 wherein said additive is hydroxylamine chlorohydrate.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |