Patent US5054148A successfully refreshed from Google Patents.
Patent US4962170A successfully refreshed from Google Patents.
US4962170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making highly absorptive polymers
Assignee: Catalent Pharma Solutions LLC
•
Filing: 1989-08-31
•
Granted: 1990-10-09
•
Expires: 2009-08-31
Abstract
Abstract A method of forming a highly adsorptive polymer, which includes the steps of: (a) homogeneously mixing a solution of a monomer consisting exclusively of one or more types of polyunsaturated monomer, a monomer solvent, and an initiator, (b) polymerizing the monomers to form a polymer, wherein the monomer solvent is a solvent for the monomers and a non-swelling non-solvent for the polymer, and (c) removing the solvent from the polymer to form a dry powder.
Inventors
- 👤 Richard C. Chromecek
- 👤 Milan F. Sojka
- 👤 Lon L. Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:23
CPC Classifications
A; A61; A61Q; A61Q19/00; A61K; A61K8/00; A61K8/02; A61K8/0216; A61K8/022; A61K8/0241; A61K8/18; A61K8/72; A61K8/81; A61K8/8141; A61K8/8152; B; B82; B82Y; B82Y5/00; C; C08; C08F; C08F2/00; C08F2/04; C08F2/06; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; A61K2800/00; A61K2800/40; A61K2800/41; A61K2800/413; A61K2800/56
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
150 words
A method of forming an adsorptive polymer by precipitation polymerization, comprising the steps of: (a) homogeneously mixing a solution of from about 0.1 to less than 25 parts by weight of a monomer consisting exclusively of one or more types of polyunsaturated monomers, from greater than 75 to about 99.9 parts by weight of a monomer solvent, wherein the total parts of said monomers and said monomer solvent is 100 parts, and between about 0.05 to 5 weight percent free radical initiator based on the weight of said monomer, (b) polymerizing said monomers by precipitation polymerization to form a polymer which is a combined system of particles, said particles ranging in size from 0.1 to 0.5 microns in diameter, and wherein said monomer solvent is a solvent for said monomers and a non-swelling non-solvent for said polymer, and (c) removing said solvent from said polymer to form a dry powder.
Claim 2
Independent Claim
150 words
A method of forming an adsorptive polymer by precipitation polymerization, comprising the steps of: (a) homogeneously mixing a solution of from about 0.1 to less than 25 parts by weight of a monomer consisting exclusively of one or more types of polyunsaturated monomers, from greater than 75 to about 99.9 parts by weight of a monomer solvent, wherein the total parts of said monomers and said monomer solvent is 100 parts, and between about 0.05 to 5 weight percent free radical initiator based on the weight of said monomer, (b) polymerizing said monomers by precipitation polymerization to form a polymer which is a combined system of particles, said particles ranging in size from 0.1 to 0.5 microns in diameter, and wherein said monomer solvent is a solvent for said monomers and a non-swelling non-solvent for said polymer, and (c) removing said solvent from said polymer to form a dry powder.
Claim 3
Dependent Claim
41 words
A method as claimed in claim 1 wherein said monomer is present from 2 parts by weight to less than 25 parts by weight and said solvent is present from greater than 75 parts by weight to 98 parts by weight.
Claim 4
Dependent Claim
37 words
A method as claimed in claim 1 wherein said monomer is present from 5 parts by weight to 20 parts by weight and said solvent is present from 80 parts by weight to 95 parts by weight.
Claim 5
Dependent Claim
16 words
A method as claimed in claim 1 wherein said removing step is by filtering and evaporating.
Claim 6
Dependent Claim
22 words
A method as claimed in claim 1 wherein said solvent has a boiling point of less than 80° C. at one atmosphere.
Claim 7
Dependent Claim
12 words
A method as claimed in claim 5 wherein said solvent is water-miscible.
Claim 8
Dependent Claim
13 words
A method as claimed in claim 6 wherein said solvent is isopropyl alcohol.
Claim 9
Independent Claim
108 words
A method of forming poly(tetraethylene glycol methacrylate), comprising: (a) homogeneously mixing a solution consisting essentially of from about 0.1 parts by weight to less than about 25 parts by weight of tetraethylene glycol dimethacrylate, from greater than about 75 parts by weight to about 99.9 parts by weight of anhydrous isopropyl alcohol, wherein the total weight of the tetraethylene glycol dimethacrylate and the anhydrous isopropyl alcohol is 100 parts, and 0.05 to 5 weight percent initiator based on the weight of the tetraethylene glycol dimethacrylate, (b) polymerizing the tetraethylene glycol dimethacrylate to form a polymer, and (c) evaporating the isopropyl alcohol from the polymer in an anhydrous atmosphere.
Claim 10
Independent Claim
108 words
A method of forming poly(tetraethylene glycol methacrylate), comprising: (a) homogeneously mixing a solution consisting essentially of from about 0.1 parts by weight to less than about 25 parts by weight of tetraethylene glycol dimethacrylate, from greater than about 75 parts by weight to about 99.9 parts by weight of anhydrous isopropyl alcohol, wherein the total weight of the tetraethylene glycol dimethacrylate and the anhydrous isopropyl alcohol is 100 parts, and 0.05 to 5 weight percent initiator based on the weight of the tetraethylene glycol dimethacrylate, (b) polymerizing the tetraethylene glycol dimethacrylate to form a polymer, and (c) evaporating the isopropyl alcohol from the polymer in an anhydrous atmosphere.
References Cited (Backward Citations)
US2809943A
Cited
US3637535A
Cited
US4224415B1
Cited
US4224415A
Cited
US3509078A
Cited
US3418262A
Cited
US3575946A
Cited
US3627770A
Cited
US3583957A
Cited
US3767600A
Cited
USRE27026E
Cited
US4076921A
Cited
US3815239A
Cited
US3989649A
Cited
DE2608533A1
Cited
US4208309A
Cited
US4724240A
Cited
CA1168157A
Cited
US4414278A
Cited
US4661327A
Cited
US4515931A
Cited
US4655957A
Cited
US4833198A
Cited
US4690825A
Cited
EP0252463A2
Cited
WO1988001164A1
Cited
US4806360A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-08 | 1994-04-09 | 1994-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-08 | 1998-04-09 | 1998-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-08 | 2002-04-09 | 2002-10-09 | $7700.00 | Window Closed / Lapsed |