Patent US3876581A successfully refreshed from Google Patents.
US3876581A
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Hydrophilic polymer composition for prosthetic devices
Assignee: Erickson Polymer Corp
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Filing: 1972-10-10
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Granted: 1975-04-08
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Expires: 1992-10-10
Abstract
Abstract Hydrophilic polymer compositions having good properties for fabrication in the dehydrated state and which become soft and resilient yet structurally stable in the hydrated state are provided. The polymer composition comprises a copolymer or terpolymer or an hydroxyalkyl acrylate or methacrylate polymerized with itself, with one or more hydrophilic vinyl monomers or a mixture of hydrophilic and hydrophobic monomers in the presence of a crosslinking agent and a suitable polymerization catalyst. To minimize stress and distortions upon hydration the polymer structure contains a water soluble substance which is substantially removable from the polymer matrix upon exposure to water whereby an exchange of the water soluble substance and water take place. This exchange minimizes stresses and distortions in the polymer matrix due to entry of water therein.
Inventors
- 👤 Amar N Neogi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:11
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/26; C08F220/28; C08F220/281
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
66 words
A HYDROPHILIC COPOLYMER AND INERT MATERIAL MIXTURE, WHEREIN STRESS AND DISTORTION DUE TO ABSORPTION OF WATER OF OBJECTS COMPOSED OF SAID MIXTURE ARE MINIMIZED UPON HYDRATION THEREOF, FORMED BY POLYMERIZING AN HYDROXALKYL METHACRYLATE OR ACRYLATE WITH MONOMERS CHOSEN FROM THE GROUP CONSISTING OF ALKOXYALKYL ACRYLATES AND METHACRYLATES IN THE PRESENCE OF ROM 1-20% BY WEIGHT OF A SUITABLE CROSS-LINKING AGENT CHOSEN FROM THE GROUP CONSISTING OF:
Claim 2
Dependent Claim
66 words
A HYDROPHILIC COPOLYMER AND INERT MATERIAL MIXTURE, WHEREIN STRESS AND DISTORTION DUE TO ABSORPTION OF WATER OF OBJECTS COMPOSED OF SAID MIXTURE ARE MINIMIZED UPON HYDRATION THEREOF, FORMED BY POLYMERIZING AN HYDROXALKYL METHACRYLATE OR ACRYLATE WITH MONOMERS CHOSEN FROM THE GROUP CONSISTING OF ALKOXYALKYL ACRYLATES AND METHACRYLATES IN THE PRESENCE OF ROM 1-20% BY WEIGHT OF A SUITABLE CROSS-LINKING AGENT CHOSEN FROM THE GROUP CONSISTING OF:
Claim 3
Dependent Claim
6 words
DIVINYLETHERS OF POLYETHELYLENE AND POLYPROPYLENE GLYCOLS;
Claim 4
Dependent Claim
6 words
DIVINYLETHERS OF POLYETHELYLENE AND POLYPROPYLENE GLYCOLS;
Claim 5
Dependent Claim
10 words
POLYETHYLENE GLYCOL, POLYPROPYLENE GLYCOL, POLYBUTYLENE GLYCOL, M.W. 1,000 TO 100,000;
Claim 6
Dependent Claim
10 words
POLYETHYLENE GLYCOL, POLYPROPYLENE GLYCOL, POLYBUTYLENE GLYCOL, M.W. 1,000 TO 100,000;
Claim 7
Dependent Claim
15 words
ESTERS AND ETHERS OF POLYETHYLENE GLYCOLS, POLYPROPYLENE GLYCOL AND POLYBUTYLENE GLYCOL, M.W. 100 TO 100,000;
Claim 8
Dependent Claim
15 words
ESTERS AND ETHERS OF POLYETHYLENE GLYCOLS, POLYPROPYLENE GLYCOL AND POLYBUTYLENE GLYCOL, M.W. 100 TO 100,000;
Claim 9
Dependent Claim
9 words
DIACRYLATES AND DIMETHACRYLATES OF POLYETHYLENE, POLYPROPYLENE AND POLYBUTYLENE GLYCOLS;
Claim 10
Dependent Claim
9 words
DIACRYLATES AND DIMETHACRYLATES OF POLYETHYLENE, POLYPROPYLENE AND POLYBUTYLENE GLYCOLS;
Claim 11
Dependent Claim
27 words
The copolymer of claim 1 wherein said monomers are chosen from the group consisting of methoxymethyl, methoxyethyl, methoxypropyl, methoxybutyl and ethoxyethyl acrylates and methacrylates and mixtures thereof.
Claim 12
Dependent Claim
17 words
The copolymer of claim 2 wherein said cross-linking agent is a divinylether of polyethylene or polypropylene glycol.
Claim 13
Dependent Claim
5 words
VINYL ACRYLATE AND METHACRYLATE; AND
Claim 14
Dependent Claim
5 words
VINYL ACRYLATE AND METHACRYLATE; AND
Claim 15
Dependent Claim
5 words
BENZOIC, TOLUIC, NAPTHOIC ACIDS; AND
Claim 16
Dependent Claim
5 words
BENZOIC, TOLUIC, NAPTHOIC ACIDS; AND
Claim 17
Dependent Claim
22 words
POLYVINYL PYRROLIDONE, POLYVINYL CAPROLACTAM, POLYVINYL PIPERIDONE, WHEREBY SAID WATER SOLUBLE INERT SUBSTANCE MAY BE REMOVED FROM SAID POLYMER BY EXPOSURE TO WATER.
Claim 18
Dependent Claim
22 words
POLYVINYL PYRROLIDONE, POLYVINYL CAPROLACTAM, POLYVINYL PIPERIDONE, WHEREBY SAID WATER SOLUBLE INERT SUBSTANCE MAY BE REMOVED FROM SAID POLYMER BY EXPOSURE TO WATER.
Claim 19
Dependent Claim
45 words
ALLYL ACRYLATE AND METHACRYLATE; WITH A POLYMERIZATION CATALYST, THERE BEING A MINOR AMOUNT UP TO 50% BY WEIGHT OF A WATER SOLUBLE INERT SUBSTANCE MIXED WITH SAID HYDROPHILIC MONOMER OR MONOMERS PRIOR TO POLYMERIZATION, SAID WATER SOLUBLE INERT SUBSTANCE CHOSEN FROM THE GROUP CONSISTING OF:
Claim 20
Dependent Claim
45 words
ALLYL ACRYLATE AND METHACRYLATE; WITH A POLYMERIZATION CATALYST, THERE BEING A MINOR AMOUNT UP TO 50% BY WEIGHT OF A WATER SOLUBLE INERT SUBSTANCE MIXED WITH SAID HYDROPHILIC MONOMER OR MONOMERS PRIOR TO POLYMERIZATION, SAID WATER SOLUBLE INERT SUBSTANCE CHOSEN FROM THE GROUP CONSISTING OF:
Claim 21
Dependent Claim
31 words
The copolymer of claim 2 wherein said water soluble inert substance is a polyethylene glycol, polybutylene glycol or polypropylene glycol having a molecular weight in the range of 1,000 to 100,000.
Claim 22
Dependent Claim
43 words
A hydrophilic copolymer composition, wherein stress and distortion of objects formed from said copolymer are minimized upon hydration thereof, formed by copolymerizing a monomer system containing the following constituents in the approximate relative quantities set forth at a temperature less than about 45.degree.C.:
Claim 23
Dependent Claim
43 words
A hydrophilic copolymer composition, wherein stress and distortion of objects formed from said copolymer are minimized upon hydration thereof, formed by copolymerizing a monomer system containing the following constituents in the approximate relative quantities set forth at a temperature less than about 45.degree.C.:
Claim 24
Independent Claim
30 words
A method of reducing stress and distortion in a hydrophilic polymer matrix due to absorption of water into the polymer matrix comprising mixing into a monomer system consisting essentially of:
Claim 25
Independent Claim
30 words
A method of reducing stress and distortion in a hydrophilic polymer matrix due to absorption of water into the polymer matrix comprising mixing into a monomer system consisting essentially of:
Claim 26
Dependent Claim
59 words
The method of claim 6 wherein said soluble inert substance is chosen from the group consisting of: 1. Polyethylene glycol, polypropylene glycol, polybutylene glycol, M. W. 1,000 to 100,000; 2. Esters and ethers of polyethylene glycols, polypropylene glycol and polybutylene glycol, M. W. 100 to 100,000; 3. Benzoic, toluic, napthoic acids; and 4. Polyvinyl pyrrolidone, polyvinyl caprolactam, polyvinyl piperidone.
Claim 27
Dependent Claim
139 words
A relatively unstressed hydrophilic copolymer of terpolymer composition containing about 5 to 40% by weight water, the polymer portion thereof formed by polymerization of a mixture comprising: from 1 to 90% by weight of hydroxyalkyl acrylate or methacrylate the alkyl group thereof having from two to six carbon atoms therein; from 99 to 10% by weight of a hydrophilic vinyl monomer chosen from the group consisting of methoxymethyl, methoxyethyl, methoxypropyl, methoxybutyl and ethoxyethyl acrylates and methacrylates and mixtures thereof; and up to 20% by weight of a cross-linking agent; wherein said mixture contained, prior to polymerization, a minor amount up to 50% by weight of a water soluble inert substance which was substantially removed upon exposure of said polymer portion to water during hydration whereby changes in dimensions of shapes formed from said polymer due to hydration are minimized.
Claim 28
Dependent Claim
139 words
A relatively unstressed hydrophilic copolymer of terpolymer composition containing about 5 to 40% by weight water, the polymer portion thereof formed by polymerization of a mixture comprising: from 1 to 90% by weight of hydroxyalkyl acrylate or methacrylate the alkyl group thereof having from two to six carbon atoms therein; from 99 to 10% by weight of a hydrophilic vinyl monomer chosen from the group consisting of methoxymethyl, methoxyethyl, methoxypropyl, methoxybutyl and ethoxyethyl acrylates and methacrylates and mixtures thereof; and up to 20% by weight of a cross-linking agent; wherein said mixture contained, prior to polymerization, a minor amount up to 50% by weight of a water soluble inert substance which was substantially removed upon exposure of said polymer portion to water during hydration whereby changes in dimensions of shapes formed from said polymer due to hydration are minimized.
Claim 29
Dependent Claim
37 words
The polymer composition of claim 8 wherein said water soluble inert substance is chosen from the group consisting of polyethylene glycol, polypropylene glycol, and polybutylene glycol having a molecular weight in the range of 1000 to 100,000.
Claim 30
Dependent Claim
59 words
The polymer composition of claim 8 wherein said water soluble inert substance is chosen from the group consisting of: 1. Polyethylene glycol, polypropylene glycol, polybutylene glycol, M.W. 1,000 to 100,000; 2. Esters and ethers of polyethylene glycols, polypropylene glycol and polybutylene glycol, M.W. 100 to 100,000; 3. Benzoic, toluic, naphthoic acids; and 4. Polyvinyl pyrrolidione, polyvinyl caprolactam, polyvinyl piperidone.
Claim 31
Dependent Claim
37 words
A hydrated hydrophilic copolymer composition, wherein stress and distortion of objects due to hydration formed from said copolymer are minimized, formed by copolymerizing a monomer system containing the following constituents in the approximate relative quantities set forth:
Claim 32
Dependent Claim
37 words
A hydrated hydrophilic copolymer composition, wherein stress and distortion of objects due to hydration formed from said copolymer are minimized, formed by copolymerizing a monomer system containing the following constituents in the approximate relative quantities set forth:
Claim 33
Dependent Claim
20 words
The method of claim 6 wherein said polymerization temperature is in the range of from about 40.degree.C. to about 45.degree.C.
Claim 34
Dependent Claim
19 words
The method of claim 6 wherein said hydrophilic polymer is formed by polymerizing a monomer system consisting essentially of:
Claim 35
Dependent Claim
122 words
A hydrophilic resin and inert material composition having a substantial portion thereof soluble in water and removable from said composition by exposure to water obtained by mixing together essentially only a hydroxyalkyl acrylate or methacrylate and a hydrophilic vinyl monomer chosen from the group consisting of alkoxyalkyl acrylates and methacrylates in the presence of an inert sybstance chosen from the group consisting of polyethylene glycol, polypropylene glycol and polybutylene glycol, having a molecular weight in the range of 1,000 to 100,000 at a polymerization temperature below 45.degree.C., polymerizing said mixture in the presence of a polymerization catalyst whereby said inert substance is substantially unincorporated in said polymer by chain transfer and is removable therefrom by exposure of said resin composition to water.
Claim 36
Dependent Claim
122 words
A hydrophilic resin and inert material composition having a substantial portion thereof soluble in water and removable from said composition by exposure to water obtained by mixing together essentially only a hydroxyalkyl acrylate or methacrylate and a hydrophilic vinyl monomer chosen from the group consisting of alkoxyalkyl acrylates and methacrylates in the presence of an inert sybstance chosen from the group consisting of polyethylene glycol, polypropylene glycol and polybutylene glycol, having a molecular weight in the range of 1,000 to 100,000 at a polymerization temperature below 45.degree.C., polymerizing said mixture in the presence of a polymerization catalyst whereby said inert substance is substantially unincorporated in said polymer by chain transfer and is removable therefrom by exposure of said resin composition to water.
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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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |