US4118554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aggregated polyelectrolytes
Assignee: Monsanto Co
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Filing: 1977-07-25
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Granted: 1978-10-03
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Expires: 1997-07-25
Abstract
Abstract {PG,1 The filterability, drying characteristics and physical form of water-insoluble, cross-linked polyelectrolytes containing amine-imide functional groups is improved without substantially diminishing the protein adsorption capacity of said polyelectrolytes by heating the polymeric starting material in inert organic solvent at a temperature ranging from about 115{20 {0 C to about 160{20 {0 C but lower than the softening point of said polymer for at least about 15 minutes and until said polymer is substantially aggregated prior to crosslinking.
Inventors
- 👤 Joseph E. Fields
- 👤 Robert J. Slocombe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:20
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08F; C08F8/00; C08F8/30; C08F8/32; C08L; C08L35/00; C08J2335/00; Y; Y10; Y10S; Y10S530/00; Y10S530/827; Y10S530/829; Y10S530/83
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
140 words
A method of improving the filterability, drying characteristics and physical form of polymers used in making water-insoluble, cross-linked polyelectrolytes containing amine-imide functional groups without substantially diminishing the protein adsorption capacity of said polyelectrolytes comprising heating said polymer in an inert organic solvent or solvent mixture at a temperature ranging from about 115° C. to about 160° C. but lower than the softening point of said polymer for at least about 15 minutes and until said polymer is substantially aggregated, said polymer comprising a copolymer of (a) unsaturated monomer having from 2 to about 18 carbon atoms and (b) a monomer selected from the group consisting of unsaturated polycarboxylic acids or anhydrides having from 4 to about 12 carbon atoms, and said polymer being thus aggregated prior to the cross-linking and substitution with the major portion of said amine-imide functional groups.
Claim 2
Independent Claim
140 words
A method of improving the filterability, drying characteristics and physical form of polymers used in making water-insoluble, cross-linked polyelectrolytes containing amine-imide functional groups without substantially diminishing the protein adsorption capacity of said polyelectrolytes comprising heating said polymer in an inert organic solvent or solvent mixture at a temperature ranging from about 115° C. to about 160° C. but lower than the softening point of said polymer for at least about 15 minutes and until said polymer is substantially aggregated, said polymer comprising a copolymer of (a) unsaturated monomer having from 2 to about 18 carbon atoms and (b) a monomer selected from the group consisting of unsaturated polycarboxylic acids or anhydrides having from 4 to about 12 carbon atoms, and said polymer being thus aggregated prior to the cross-linking and substitution with the major portion of said amine-imide functional groups.
Claim 3
Dependent Claim
27 words
The method of claim 1 in which the inert organic solvent is selected from the group consisting of xylene, ethylbenzene, mono- and dichlorobenzene, cumene and mixtures thereof.
Claim 4
Dependent Claim
20 words
The method of claim 1 in which the heating is carried out for about 15 minutes to about one hour.
Claim 5
Dependent Claim
29 words
The method of claim 1 in which the polymer is a copolymer of maleic acid or anhydride and monomer selected from the group consisting of ethylene, styrene and isobutylene.
Claim 6
Dependent Claim
19 words
The method of claim 4 in which the polymer is a copolymer of ethylene and maleic anhydride and/or acid.
Claim 7
Dependent Claim
128 words
An aggregated, water-insoluble, cross-linked polyelectrolyte containing amine-imide functional groups comprising a copolymer of (a) unsaturated monomer having from 2 to about 18 carbon atoms and (b) a monomer providing reactive sites and selected from the group consisting of unsaturated polycarboxylic acid or anhydride having from 4 to about 12 carbon atoms, and in which from about 2 to 100% of the reactive sites in said copolymer are substituted with amine-imide functional groups, said polyelectrolyte being thus aggregated prior to cross-linking and substitution with the major portion of said amine-imide functional groups, the major portion of said aggregated polyelectrolyte copolymer having a particle size ranging from about 50 to about 200 microns, said major portion in both instances being defined to mean more than 50% of the entire portion.
Claim 8
Dependent Claim
128 words
An aggregated, water-insoluble, cross-linked polyelectrolyte containing amine-imide functional groups comprising a copolymer of (a) unsaturated monomer having from 2 to about 18 carbon atoms and (b) a monomer providing reactive sites and selected from the group consisting of unsaturated polycarboxylic acid or anhydride having from 4 to about 12 carbon atoms, and in which from about 2 to 100% of the reactive sites in said copolymer are substituted with amine-imide functional groups, said polyelectrolyte being thus aggregated prior to cross-linking and substitution with the major portion of said amine-imide functional groups, the major portion of said aggregated polyelectrolyte copolymer having a particle size ranging from about 50 to about 200 microns, said major portion in both instances being defined to mean more than 50% of the entire portion.
Claim 9
Dependent Claim
30 words
The aggregated polyelectrolyte of claim 6 in which said copolymer is a copolymer of maleic acid or anhydride and monomer selected from the group consisting of ethylene, styrene and isobutylene.
Claim 10
Dependent Claim
20 words
The aggregated polyelectrolyte of claim 7 in which said copolymer is a copolymer of ethylene and maleic acid or anhydride.
Claim 11
Dependent Claim
22 words
The aggregated polyelectrolyte of claim 6 in which the amine-imide functional group is selected from the group consisting of diloweralkylaminoloweralkylimide and lower-alkyliminodi(loweralkylimide).
Claim 12
Dependent Claim
29 words
The aggregated polyelectrolyte of claim 6 in which the amine-imide functional group is selected from the group consisting of aminoloweralkyl substituted pyridine, piperidine, piperazine, picoline, pyrrolidine, morpholine and imidazole.
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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) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |