Patent US3214351A successfully refreshed from Google Patents.
Patent US3644231A successfully refreshed from Google Patents.
US3644231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous member for diffusing air and process for producing the same
Assignee: Kanegafuchi Spinning Co Ltd
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Filing: 1968-03-01
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Granted: 1972-02-22
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Expires: 1988-03-01
Abstract
Abstract The invention relates to a method of foaming a solution of a polyvinyl acetal resin containing a foaming agent and thereafter impregnating said foam with a precondensate or monomer of curable resin. The final product is used as a member for diffusing gas.
Inventors
- 👤 Mitsuru Maruya
- 👤 Yoshio Oono
- 👤 Bunji Fukuda
- 👤 Kenji Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:40
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/42; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/231; B01F23/23105; B01F23/2312; B01F23/23123; B01F23/23126; B01F23/231265; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/20; C12; C12M; C12M29/00; C12M29/06; C08J2329/00; C08J2329/14; C08J2461/00; C08J2463/00; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
24 words
A porous solid member as claimed in claim 1 wherein said cured resin is present in the polyvinyl acetal body as previously mixed therewith.
Claim 2
Dependent Claim
26 words
A porous solid member as claimed in claim 1 wherein said cured resin is present in the polyvinyl acetal body as previously impregnated and cured therein.
Claim 3
Dependent Claim
159 words
A method of producing a porous solid member of claim 3 which comprises heating a mixture of an aqueous solution of polyvinyl alcohol, an aldehyde, an acetalization acid catalyst and a pore-producing agent selected from starch and dextrin at a temperature of 30* - 70* C. for 10-30 hours to obtain a solid porous polyvinyl acetal body having a porosity of 40-90 percent and an acetalization degree of 60-84 percent (mol), washing and drying the same, impregnating the porous polyvinyl acetal body with a solution of a precondensate or monomer of curable resin selected from the group consisting of phenol-formaldehyde resins, melamine-formaldehyde resins, urea-formaldehyde resins and epoxy resins formed from a member selected from the group consisting of bisphenol-epichlorohydrin precondensates, epoxylated polyolefins, diglycidyl ethers of polyethylene glycols, diglycidyl ethers of polypropylene glycols, diglycidyl ethers of bisphenol A, 1,10-dimethoxy-3,4,7,8-diepoxydecane and 2,6-diglycidyl phenylglycidyl ether, and a cuRing catalyst therefor, and then heating the impregnated porous body at 60* - 150* C.
Claim 4
Dependent Claim
123 words
A method of producing a porous solid member of claim 2 which comprises mixing an aqueous solution of polyvinyl alcohol, an aldehyde, an acid catalyst, a pore-producing agent selected from starch and dextrin, and a precondensate or monomer of curable resin selected from the group consisting of phenol-formaldehyde resins, melamine-formaldehyde resins, urea-formaldehyde resins and epoxy resins, formed from a member selected from the group consisting of bisphenol-epichlorohydrin precondensates, epoxylated polyolefins, diglycidyl ethers of polyethylene glycols, diglycidyl ethers of polypropylene glycols, diglycidyl ether of bisphenol A, 1,10-dimethoxy-3,4,7,8 diepoxydecane and 2, 6-diglycidyl phenylglycidyl phenylglycidyl ether, heating the mixture at 30* - 70* C. for 10-30 hours to conduct the acetalizaton and curing of the resin, and then washing and drying the resulting solid porous body.
Claim 5
Dependent Claim
24 words
A method according to claim 4 wherein the aldehyde is selected from the group consisting of formaldehyde, acetaldehyde, butylaldehyde, 2-ethylhexylaldehyde, laurylaldehyde, glyoxal and benzaldehyde.
Claim 6
Dependent Claim
24 words
A method according to claim 5 wherein the aldehyde is selected from the group consisting of formaldehyde, acetaldehyde, butylaldehyde, 2-ethylhexylaldehyde, laurylaldehyde, glyoxal and benzaldehyde.
Claim 7
Dependent Claim
16 words
A porous solid member according to claim 1, wherein the cured resin is a phenol-formaldehyde resin.
Claim 8
Dependent Claim
15 words
A porous solid member according to claim 1 wherein the resin is a melamine-formaldehyde resin.
Claim 9
Dependent Claim
16 words
A porous solid member according to claim 1 wherein the cured resin is a urea-formaldehyde resin.
References Cited (Backward Citations)
US2876085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |