US4797425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing porous material having open pores
Assignee: Toto Ltd
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Filing: 1987-09-03
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Granted: 1989-01-10
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Expires: 2007-09-03
Abstract
Abstract A method of producing a porous material having open pores comprises the steps of preparing an emulsion slurry by vigorously agitating a mixture comprising a main ingredient, a polyamide hardener, a filler and water, casting said emulsion slurry in a water-impermeable mold, hardening said slurry while it contains the water. The main ingredient is a bisphenol-type epoxy resin added with one or more reactive diluents each having one or more epoxy rings per molecule and added in an amount of 18 to 50 wt %, based on 100 wt % of said bisphenol-type epoxy resin. A large size molded product having a high wet bending strength and a complicated contour can be produced.
Inventors
- 👤 Noboru Kishima
- 👤 Akio Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:35
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J9/283; C08J2363/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
A method of producing a porous material having open pores, comprising the steps of preparing an emulsion slurry by vigorously agitating a mixture comprising a main ingredient, a polyamide hardener, a filler and water, casting said emulsion slurry in a water-impermeable mold, hardening said slurry while it contains the water, wherein the improvement comprises that said main ingredient is a bisphenol epoxy resin added with one or more reactive diluent each having one or more epoxy rings per molecule and added in an amount of 27-50 wt %, based on 100 wt % of said bisphenol epoxy resin.
Claim 2
Independent Claim
98 words
A method of producing a porous material having open pores, comprising the steps of preparing an emulsion slurry by vigorously agitating a mixture comprising a main ingredient, a polyamide hardener, a filler and water, casting said emulsion slurry in a water-impermeable mold, hardening said slurry while it contains the water, wherein the improvement comprises that said main ingredient is a bisphenol epoxy resin added with one or more reactive diluent each having one or more epoxy rings per molecule and added in an amount of 27-50 wt %, based on 100 wt % of said bisphenol epoxy resin.
Claim 3
Dependent Claim
98 words
A method of producing a porous material according to claim 1, wherein said polyamide hardener is either (a) a mixture of (i) an amide compound which is obtained through a reaction between a monomeric fatty acid and anethyleneamine represented by the formula of H 2 N--(CH 2 --CH 2 NH) n --H where "n" is 3 to 5, and (ii) a polymeric fatty acid polyamide obtained through a reaction of a polymeric fatty acid and said ethyleneamine, or (b) a reaction mixture obtained by mixing reaction of said monomeric fatty acid, said polymeric fatty acid and said ethyleneamine.
Claim 4
Dependent Claim
33 words
A method of producing a porous material according to claim 1, wherein said mixture further comprises an additional hardener selected from the group consisting of amine hardeners, modified polyamine hardeners and mixture thereof.
Claim 5
Dependent Claim
21 words
A method of producing a porous material according to claim 1 or 3, wherein said mixture further comprises a hardening accelerator.
Claim 6
Dependent Claim
21 words
A method of producing a porous material according to claim 1, or 3 wherein said mixture further comprises a surface reformer.
Claim 7
Independent Claim
28 words
A method of producing a porous material according to claims 1 or 3, wherein the reactive diluent comprises a mixture of m-cresylglycidyl ether, p-cresylglycidyl ether and styrene oxide.
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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) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |