Patent US3882005A successfully refreshed from Google Patents.
US3882005A
Expired / Lapsed
US
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Process for preventing discoloration in hydrolyzed ethylene-vinyl acetate copolymers by exposure to radiation
Assignee: Millennium Petrochemicals Inc
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Filing: 1973-07-10
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Granted: 1975-05-06
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Expires: 1993-07-10
Abstract
Abstract A process for the hydrolysis of a solid interpolymer of an ethylenically unsaturated hydrocarbon and a vinyl ester of a 2-6 carbon atom aliphatic carboxylic acid to products having a low yellowness index involves contacting of the solid interpolymer with a substantially anhydrous hydrolyzing agent and subjecting at least one of said interpolymer and said hydrolyzing agent to radiation.
Inventors
- 👤 John M Hoyt
- 👤 Karl Koch
- 👤 Jr Mathew Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:56
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12; C08F2800/00; C08F2800/20; C08F2810/00; C08F2810/50
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
98 words
A PROCESS FOR THE HYDROLYSIS OF A SOLID INTERPOLYMER OF AN A-OLEFIN OF 2-10 CARBON ATOMS AND ABOUT 1-25 MOLE PERCENT VINYL ESTER OF A 2-6 CARBON ATOM SATURATED ALIPHATIC CARBOXYLIC ACID TO A PRODUCT HAVING A LOW YELLOWNESS INCEX (ASTM D192563T) OF LESS THAN 30 WHICH COMPRISES CONTACTING SAID SOLID INTERPOLYMER WITH A SUBSTANTIALLY ANHYDROUS ALCOHOLIZING AGENT FOR A TIME SUFFICIENT TO REDUCE THE RESIDUAL VINYL ESTER CONTENT OF 0.1-15 WEIGHT PERCENT AND SUBJECTING AT LEAST ONE OF SAID INTERPOLYMER AND SAID HYDROLYZING AGENT TO IRRADIATION OF WAVE LENGTHS IN THE RANGE OF ABOUT 3000-8000 ANGSTROM UNITS.
Claim 2
Dependent Claim
98 words
A PROCESS FOR THE HYDROLYSIS OF A SOLID INTERPOLYMER OF AN A-OLEFIN OF 2-10 CARBON ATOMS AND ABOUT 1-25 MOLE PERCENT VINYL ESTER OF A 2-6 CARBON ATOM SATURATED ALIPHATIC CARBOXYLIC ACID TO A PRODUCT HAVING A LOW YELLOWNESS INCEX (ASTM D192563T) OF LESS THAN 30 WHICH COMPRISES CONTACTING SAID SOLID INTERPOLYMER WITH A SUBSTANTIALLY ANHYDROUS ALCOHOLIZING AGENT FOR A TIME SUFFICIENT TO REDUCE THE RESIDUAL VINYL ESTER CONTENT OF 0.1-15 WEIGHT PERCENT AND SUBJECTING AT LEAST ONE OF SAID INTERPOLYMER AND SAID HYDROLYZING AGENT TO IRRADIATION OF WAVE LENGTHS IN THE RANGE OF ABOUT 3000-8000 ANGSTROM UNITS.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein said contact is for a time sufficient to reduce the residual vinyl ester content to 0.1-5 weight percent.
Claim 4
Dependent Claim
19 words
The process of claim 2 wherein the source of said irradiation is a mercury lamp or a fluorescent lamp.
Claim 5
Dependent Claim
18 words
The process of claim 2 wherein said hydrolyzing agent is an alcohol in combination with a hydrolysis catalyst.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein the catalyst is an alkali metal alkoxide.
Claim 7
Dependent Claim
14 words
The process of claim 4 wherein said hydrolysis agent additionally contains a softening solvent.
Claim 8
Dependent Claim
17 words
The process of claim 2 wherein said interpolymer is a copolymer of ethylene and said vinyl ester.
Claim 9
Dependent Claim
12 words
The process of claim 7 wherein the vinyl ester is vinyl acetate.
Claim 10
Dependent Claim
89 words
A process for the hydrolysis of a soild copolymer of ethylene and about 1-25 mole percent vinyl acetate to a product having a yellowness index (ASTM D-1925-63T) of less than 30 which comprises contacting said copolymer with a substantially anhydrous mixture of an alcohol and an alkali metal alkoxide for a time sufficient to reduce the residual vinyl acetate content to 0.1-15 weight percent and subjecting at least one of said copolymer, and said mixture to electromagnetic radiation of wave lengths in the range of about 3000-8000 Angstrom units.
Claim 11
Dependent Claim
89 words
A process for the hydrolysis of a soild copolymer of ethylene and about 1-25 mole percent vinyl acetate to a product having a yellowness index (ASTM D-1925-63T) of less than 30 which comprises contacting said copolymer with a substantially anhydrous mixture of an alcohol and an alkali metal alkoxide for a time sufficient to reduce the residual vinyl acetate content to 0.1-15 weight percent and subjecting at least one of said copolymer, and said mixture to electromagnetic radiation of wave lengths in the range of about 3000-8000 Angstrom units.
Claim 12
Dependent Claim
42 words
The process of claim 9 wherein said mixture is continuously recirculated between a zone containing said copolymer and a zone remote from said copolymer zone and wherein said radiation is applied to said mixture at said zone remote from said copolymer zone.
Claim 13
Dependent Claim
14 words
The process of claim 9 wherein said radiation is applied to the hydrolyzed copolymer.
Claim 14
Dependent Claim
24 words
The process of claim 9 wherein said contact is for a time sufficient to reduce the residual vinyl acetate content to 0.1-5 weight percent.
Claim 15
Dependent Claim
85 words
A process for reducing the yellowness index (ASTM D-1925-63T) of a hydrolyzed solid interpolymer of an Alpha -Olefin of 2-10 carbon atoms and about 1-25 mole percent vinyl ester of a 2-6 carbon atom saturated aliphatic carboxylic acid having a residual vinyl ester content of 0.1-15 weight percent hydrolyzed with a substantially anhydrous alcoholizing agent which comprises subjecting said hydrolyzed interpolymer to radiation of wave lengths in the range of 3000-8000 Angstrom units said radiation being applied until the yellowness index is less than 30.
Claim 16
Dependent Claim
85 words
A process for reducing the yellowness index (ASTM D-1925-63T) of a hydrolyzed solid interpolymer of an Alpha -Olefin of 2-10 carbon atoms and about 1-25 mole percent vinyl ester of a 2-6 carbon atom saturated aliphatic carboxylic acid having a residual vinyl ester content of 0.1-15 weight percent hydrolyzed with a substantially anhydrous alcoholizing agent which comprises subjecting said hydrolyzed interpolymer to radiation of wave lengths in the range of 3000-8000 Angstrom units said radiation being applied until the yellowness index is less than 30.
Claim 17
Dependent Claim
25 words
The process of claim 13 wherein said interpolymer is an interpolymer of an Alpha -olefin of 2-4 carbon atoms and 3-18 mole percent vinyl ester.
Claim 18
Dependent Claim
18 words
The process of claim 14 wherein said Alpha -olefin is ethylene and said vinyl ester is vinyl acetate.
Claim 19
Dependent Claim
18 words
The process of claim 13 wherein said Alpha -olefin is ethylene and said vinyl ester is vinyl acetate.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |