US4463123A
Expired / Lapsed
US
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Method for reducing block of ethylene interpolymers containing --COOH groups
Assignee: Dow Chemical Co
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Filing: 1982-09-27
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Granted: 1984-07-31
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Expires: 2002-09-27
Abstract
Abstract The blocking characteristics of ethylene interpolymers containing --COOH groups are reduced by treating such polymers with a solution of an inorganic compound of a Group I-A metal such as trisodium phosphate and an organic compound of a Group I-A metal such as sodium acetate or a combination thereof.
Inventors
- 👤 David P. Flores
- 👤 James A. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:19
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; C08K; C08K5/00; C08K5/04; C08K5/09; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A method for reducing the tendency for particles of an interpolymer of ethylene and a polymerizable ethylenically unsaturated monomer containing carboxyl groups to block and stick, which method comprises treating by contacting said particles with sufficient quantities of a solution containing (1) from about 0.10 to about 5 weight percent of an inorganic metal salt represented by the general formula M a Y b wherein M is a metal from Groups I-A or II-A of the Periodic Table, Y is a carbonate, sulfate, phosphate, nitrate or bicarbonate group, and a and b have values such that will balance the general formula and (2) from about 0.10 to about 5 weight percent of a solution of a carboxylic acid having the general formula ##STR4## wherein R is an alkyl group at a temperature of from about 0° C. to about 85° C. for a sufficient time so as to provide the resultant treated particles, after drying, with reduced blocking and/or sticking properties.
Claim 2
Independent Claim
161 words
A method for reducing the tendency for particles of an interpolymer of ethylene and a polymerizable ethylenically unsaturated monomer containing carboxyl groups to block and stick, which method comprises treating by contacting said particles with sufficient quantities of a solution containing (1) from about 0.10 to about 5 weight percent of an inorganic metal salt represented by the general formula M a Y b wherein M is a metal from Groups I-A or II-A of the Periodic Table, Y is a carbonate, sulfate, phosphate, nitrate or bicarbonate group, and a and b have values such that will balance the general formula and (2) from about 0.10 to about 5 weight percent of a solution of a carboxylic acid having the general formula ##STR4## wherein R is an alkyl group at a temperature of from about 0° C. to about 85° C. for a sufficient time so as to provide the resultant treated particles, after drying, with reduced blocking and/or sticking properties.
Claim 3
Dependent Claim
28 words
A method of claim 1 wherein component 1 contains at least one compound having as the cation sodium, potassium or lithium and as the anion phosphate or carbonate.
Claim 4
Dependent Claim
30 words
A method of claim 2 wherein in component (1) said cation is sodium and component (2) contains at least one of acetic acid, propanoic acid, butanoic acid or stearic acid.
Claim 5
Independent Claim
30 words
A method of claims 1, 2, or 3 wherein said interpolymer is a copolymer of ethylene and acrylic acid containing from about 10% to about 40% acrylic acid by weight.
Claim 6
Dependent Claim
17 words
A method of claim 4 wherein said copolymer has a melt index of less than about 150.
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) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |