US3888945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing polymers in solid particulate form
Assignee: Roehm GmbH Darmstadt
•
Filing: 1972-07-10
•
Granted: 1975-06-10
•
Expires: 1992-07-10
Abstract
Abstract Method of making a polymer in solid particulate form by finely distributing a solution of the polymer, in a volatile polar solvent therefor, in a non-polar organic liquid suspending medium substantially immiscible with said polar solvent and not a solvent for said polymer, and then removing the volatile solvent while inhibiting aggregation of the resultant polymer solids by the presence of a surface-active agent, preferably a block copolymer or graft copolymer having a polar and a non-polar portion.
Inventors
- 👤 Peter Joseph Arndt
- 👤 Horst Pennewiss
- 👤 Hermann Plainer
- 👤 Wilhelm Krall
- 👤 Juergen Masanek
- 👤 Manfred Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:27
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
136 words
A METHOD FOR PREPARING A WATER-SOLUBLE POLYMER IN SOLID PARTICULATE FORM, WHICH METHOD COMPRISES FINELY DISTRIBUTING DROPLETS, OF AN AVERAGE DROPLET SIZE BETWEEN 0.1 MM AND 10 MM, OF AN AQUEOUS SOLUTION OF SAID POLYMER IN A NON-POLAR ORGANIC SUSPENDING MEDIUM WHICH IS NOT A SOLVENT FOR SAID POLYMER, SAID AQUEOUS SOLUTION OF POLYMER COMPRISING AS THE SOLVENT THEREIN WATER OR A MIXTURE OF WATER AND A POLAR ORGANIC SOLVENT, SAID AQUEOUS SOLUTION AND SAID NON-POLAR ORGANIC SUSPENDING MEDIUM BEING SUBSTANTIALLY IMMISCIBLE WHEREBY A LIQUID/LIQUID DISPERSION IS FORMED, AND THEN REMOVING WATER FROM THE DISPERSION BY AZEOTROPIC DISTALLATION, AT LEAST A PORTION OF SAID WATER BEING DISTALLATIVELY REMOVED IN THE PRESENCE OF AN ORGANIC WATER-IN-OIL SUSPENDING AGENT HAVING A POLAR PORTION SOLVATED BY SAID AQUEOUS SOLUTION AND A NON-POLAR PORTION SOLVATED BY SAID NON-POLAR SUSPENDING MEDIUM.
Claim 2
Independent Claim
136 words
A METHOD FOR PREPARING A WATER-SOLUBLE POLYMER IN SOLID PARTICULATE FORM, WHICH METHOD COMPRISES FINELY DISTRIBUTING DROPLETS, OF AN AVERAGE DROPLET SIZE BETWEEN 0.1 MM AND 10 MM, OF AN AQUEOUS SOLUTION OF SAID POLYMER IN A NON-POLAR ORGANIC SUSPENDING MEDIUM WHICH IS NOT A SOLVENT FOR SAID POLYMER, SAID AQUEOUS SOLUTION OF POLYMER COMPRISING AS THE SOLVENT THEREIN WATER OR A MIXTURE OF WATER AND A POLAR ORGANIC SOLVENT, SAID AQUEOUS SOLUTION AND SAID NON-POLAR ORGANIC SUSPENDING MEDIUM BEING SUBSTANTIALLY IMMISCIBLE WHEREBY A LIQUID/LIQUID DISPERSION IS FORMED, AND THEN REMOVING WATER FROM THE DISPERSION BY AZEOTROPIC DISTALLATION, AT LEAST A PORTION OF SAID WATER BEING DISTALLATIVELY REMOVED IN THE PRESENCE OF AN ORGANIC WATER-IN-OIL SUSPENDING AGENT HAVING A POLAR PORTION SOLVATED BY SAID AQUEOUS SOLUTION AND A NON-POLAR PORTION SOLVATED BY SAID NON-POLAR SUSPENDING MEDIUM.
Claim 3
Dependent Claim
24 words
A method as in claim 1 wherein at least one of said polar portion and said non-polar portion of said suspending agent is macromolecular.
Claim 4
Dependent Claim
81 words
A method as in claim 1 wherein said suspending agent is a member selected from the group consisting of graft copolymers having a backbone polymer portion which is the polar portion or the non-polar portion thereof, and a grafted polymer portion which is the non-polar portion or the polar portion thereof respectively; and block copolymers comprising at least one first block portion which is the polar portion thereof and at least one second block portion which is the non-polar portion thereof.
Claim 5
Dependent Claim
29 words
A method as in claim 3 wherein the molecular weight of the non-polar portion of said suspending agent is from 10 to 100 times that of the polar portion.
Claim 6
Dependent Claim
37 words
A method as in claim 3 wherein the molecular weight of the non-polar portion of said suspending agent is from 20,000 to 5, 000,000 and the molecular weight of said polar portion is from 2000 to 50,000.
Claim 7
Dependent Claim
14 words
A method as in claim 3 wherein said suspending agent is a block copolymer.
Claim 8
Dependent Claim
14 words
A method as in claim 3 wherein said suspending agent is a graft copolymer.
Claim 9
Dependent Claim
20 words
A method as in claim 7 wherein the backbone portion is the non-polar portion of said graft copolymeric suspending agent.
Claim 10
Dependent Claim
15 words
A method as in claim 1 wherein said organic suspending medium comprises an aliphatic hydrocarbon.
Claim 11
Dependent Claim
52 words
A method as in claim 1 wherein said polymer predominantly comprises at least one member selected from the group consisting of acrylic acid, methacrylic acid, and metal, ammonium, and amino salts of these acids; acrylamide; methacrylamide; and amino alkyl acrylates, amino alkyl methacrylates, and acid addition salts and quaternary ammonium salts thereof.
References Cited (Backward Citations)
US3317635A
Cited
US3236800A
Cited
US3450650A
Cited
US3382297A
Cited
US3424705A
Cited
US3405087A
Cited
US3691123A
Cited
US3655591A
Cited
US3446769A
Cited
US3532663A
Cited
US3607821A
Cited
US3661835A
Cited
US3728301A
Cited
US3654193A
Cited
US3673142A
Cited
US3759864A
Cited
US3733294A
Cited
US3737401A
Cited
US3787525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |