US3856914A
Expired / Lapsed
US
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Method of making a porous polymeric material
Assignee: Kinyosha Co Ltd
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Filing: 1973-09-04
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Granted: 1974-12-24
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Expires: 1993-09-04
Abstract
Abstract A method of making a porous polymeric material comprising a plurality of interconnected cells, comprising mixing together 100 parts of a liquid prepolymer, at least 40 parts of an inert organic liquid and 1.5 to 15 parts of an emulsifier to form a stable emulsion of dispersed liquid prepolymer in the organic liquid, heating the emulsion to at least 90* C in the presence of a cross-linking agent to form a porous polymeric material with a plurality of interconnected cells filled with the organic liquid, and extracting the organic liquid from the cells.
Inventors
- 👤 M Maeda
- 👤 A Onuki
- 👤 K Kusano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:50
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J2201/00; C08J2201/04; C08J2201/054; C08J2201/0542; C08J2201/0543; C08J2201/0545; C08J2201/0546
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
171 words
A METHOD OF MAKING A POUROUS POLYMERIC MATERIAL COMPRISING A PLURALITY OF INTERCONNECTED CELLS, WHICH METHOD COMPRISES: A. MIXING TOGETHER 100 PARTS OF A LIQUID PREPOLYMER WHICH CAN BE CONVERTED FROM LIQUID TO SOLID FORM BY CROSSLINKING DURING STEP (B), AT LEAST 40 PARTS OF AN INERT ORGANIC LIQUID WHICH IS INSOLUBLE IN THE PREPOLYMER AND DOES NOT BOIL UNDER THE CONDITIONS OF STEP (B) AND 1.5 TO 15 PARTS OF AN EMULSIFIER THE EMULSIFYING ACTION OF WHICH IS PROGRESSIVELY DECREASED WHEN HEATED IN THE PRESENCE OF THE CROSS-LINKING AGENT FOR THE PREPOLYMER USED IN STEP (B) TO FORM A STABLE EMULSION OF DISPERSED LIQUID PREPOLYMER IN THE ORGANIC LIQUID; B. HEATING THE EMULSION TO AT LEAST 90*C IN THE PRESENCE OF A CROSS-LINKING AGENT FOR THE PREPOLYMER TO COAGULATE THE PREPOLYMER DISPERSION INTO LARGER PARTICLES AND TO SOLIDIFY THESE PARTICLES AND BOND THEM TOGETHER TO FORM A POROUS POLYMERIC MATERIAL WITH A PLURALITY OF INTERCONNECTED CELLS FILLED WITH THE ORGANIC LIQUID; AND C. EXTRACTING THE ORGANIC LIQUID FROM THE CELLS.
Claim 2
Independent Claim
171 words
A METHOD OF MAKING A POUROUS POLYMERIC MATERIAL COMPRISING A PLURALITY OF INTERCONNECTED CELLS, WHICH METHOD COMPRISES: A. MIXING TOGETHER 100 PARTS OF A LIQUID PREPOLYMER WHICH CAN BE CONVERTED FROM LIQUID TO SOLID FORM BY CROSSLINKING DURING STEP (B), AT LEAST 40 PARTS OF AN INERT ORGANIC LIQUID WHICH IS INSOLUBLE IN THE PREPOLYMER AND DOES NOT BOIL UNDER THE CONDITIONS OF STEP (B) AND 1.5 TO 15 PARTS OF AN EMULSIFIER THE EMULSIFYING ACTION OF WHICH IS PROGRESSIVELY DECREASED WHEN HEATED IN THE PRESENCE OF THE CROSS-LINKING AGENT FOR THE PREPOLYMER USED IN STEP (B) TO FORM A STABLE EMULSION OF DISPERSED LIQUID PREPOLYMER IN THE ORGANIC LIQUID; B. HEATING THE EMULSION TO AT LEAST 90*C IN THE PRESENCE OF A CROSS-LINKING AGENT FOR THE PREPOLYMER TO COAGULATE THE PREPOLYMER DISPERSION INTO LARGER PARTICLES AND TO SOLIDIFY THESE PARTICLES AND BOND THEM TOGETHER TO FORM A POROUS POLYMERIC MATERIAL WITH A PLURALITY OF INTERCONNECTED CELLS FILLED WITH THE ORGANIC LIQUID; AND C. EXTRACTING THE ORGANIC LIQUID FROM THE CELLS.
Claim 3
Dependent Claim
26 words
The method according to claim 1 wherein after step (a) and before step (b), the emulsion is shaped in a mold, to form a shaped article.
Claim 4
Dependent Claim
39 words
The method according to claim 1 wherein after step (a) and before step (b), the emulsion is coated as a layer on a substrate, and steps (b) and (c) are effected whilst the emulsion is coated on the substrate.
Claim 5
Dependent Claim
25 words
The method according to claim 1 wherein the liquid prepolymer is a polysiloxane, the organic liquid is diethylene glycol and the emulsifier is polyoxyethyleneoleyl ether.
Claim 6
Dependent Claim
26 words
The method according to claim 1 wherein the liquid prepolymer is a polysulfide, the organic liquid is a mineral oil and the emulsifier is glyceryl monostearate.
Claim 7
Dependent Claim
26 words
The method according to claim 1 wherein the liquid prepolymer is a urethane resin, the organic liquid is dioctyl phthalate and the emulsifier is sorbitan monostearate.
Claim 8
Dependent Claim
26 words
The method according to claim 1 wherein the liquid prepolymer is a polychloroprene, the organic liquid is a silicone oil and the emulsifier is glyceryl monostearate.
Claim 9
Dependent Claim
27 words
The method according to claim 1 wherein the liquid prepolymer is an acrylonitrile-butadiene copolymer, the organic liquid is a mineral oil and the emulsifier is sorbitan monostearate.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |