US4506041A
Expired / Lapsed
US
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Powdered binder for mold-making and a process for preparing a mold by using the same
Assignee: KINSEI KOGYO Co Ltd A CORPOF JAPAN
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Filing: 1983-06-30
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Granted: 1985-03-19
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Expires: 2003-06-30
Abstract
Abstract A binder of this invention is a powder which comprises an intimate mixture of a copolymer of maleic anhydride with an olefinically unsaturated compound selected from the group consisting of an aliphatic alpha -olefin having 2 to 8 carbon atoms, styrene and methyl vinyl ether, 0.2 to 2.0 equivalents of a caustic alkali per carboxyl equivalent of said copolymer, and if desired, 30 to 500 parts by weight of an alkaline earth metal hydroxide per 100 parts of the total weight of said copolymer and said caustic alkali, and if desired, up to 300 parts by weight of additive per 100 parts of the total weight of said copolymer and said caustic alkali. A process for preparing a mold according to this invention comprises mixing said powdered binder with refractory particles and a small amount of water under agitation, and forming the resulting mixture into a shaped product, whereafter the shaped product is hardened by blowing CO2 gas therethrough.
Inventors
- 👤 Takatoshi Tanigawa
- 👤 Sakari Yaegashi
- 👤 Tetsuo Nakazawa
- 👤 Masahiko Hatazi
- 👤 Tadao Nango
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:40
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2266; B22C1/162
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
80 words
A powdered binder which comprises an intimate mixture of a copolymer of maleic anhydride with an olefinically unsaturated compound selected from the group consisting of an aliphatic α-olefin having 2 to 8 carbon atoms, styrene and methyl vinyl ether, 0.2 to 2.0 equivalents of a caustic alkali per carboxyl equivalent of said copolymer and 0.3 to 5.0 parts by weight of an alkaline earth metal hydroxide per 1 part of the total weight of said copolymer and said caustic alkali.
Claim 2
Dependent Claim
80 words
A powdered binder which comprises an intimate mixture of a copolymer of maleic anhydride with an olefinically unsaturated compound selected from the group consisting of an aliphatic α-olefin having 2 to 8 carbon atoms, styrene and methyl vinyl ether, 0.2 to 2.0 equivalents of a caustic alkali per carboxyl equivalent of said copolymer and 0.3 to 5.0 parts by weight of an alkaline earth metal hydroxide per 1 part of the total weight of said copolymer and said caustic alkali.
Claim 3
Dependent Claim
14 words
The powdered binder of claim 1 wherein said alphatic α-olefin is ethylene or isobutylene.
Claim 4
Dependent Claim
18 words
The powdered binder of claim 1 wherein said copolymer has a molecular weight of 17×10 4 or less.
Claim 5
Dependent Claim
14 words
The powdered binder of claim 1 wherein said austic alkali is NaOH or KOH.
Claim 6
Dependent Claim
16 words
The powdered binder of claim 1 wherein said alkaline earth metal hydroxide is Ca(OH) 2 .
Claim 7
Dependent Claim
36 words
The powdered binder of claim 1 wherein 0.8 to 2.0 parts by weight of said alkaline earth metal hydroxide is intimately mixed with 1 part of the total weight of said copolymer and said caustic alkali.
Claim 8
Dependent Claim
97 words
A process for preparing a mold which comprises mixing refractory particles with a powdered binder, alkaline earth metal hydroxide powders and water, and forming the resulting mold-making composition into a shaped product, whereafter the shaped product is hardened by blowing CO 2 gas therethrough, said powdered binder comprising an intimate mixture of a copolymer of maleic anhydride with an olefinically unsaturated compound selected from the group consisting of an aliphatic α-olefin having 2 to 8 carbon atoms, styrene and methyl vinyl ether, and 0.2 to 2.0 equivalents of a caustic alkali per carboxyl equivalent of said copolymer.
Claim 9
Dependent Claim
97 words
A process for preparing a mold which comprises mixing refractory particles with a powdered binder, alkaline earth metal hydroxide powders and water, and forming the resulting mold-making composition into a shaped product, whereafter the shaped product is hardened by blowing CO 2 gas therethrough, said powdered binder comprising an intimate mixture of a copolymer of maleic anhydride with an olefinically unsaturated compound selected from the group consisting of an aliphatic α-olefin having 2 to 8 carbon atoms, styrene and methyl vinyl ether, and 0.2 to 2.0 equivalents of a caustic alkali per carboxyl equivalent of said copolymer.
Claim 10
Dependent Claim
13 words
The process of claim 7 wherein said aliphatic α-olefin is ethylene or isobutylene.
Claim 11
Dependent Claim
17 words
The process of claim 7 wherein said copolymer has a molecular weight of 17×10 4 or less.
Claim 12
Dependent Claim
13 words
The process of claim 7 wherein said caustic alkali is NaOH or KOH.
Claim 13
Dependent Claim
15 words
The process of claim 7 wherein said alkaline earth metal hydroxide is Ca(OH) 2 .
Claim 14
Dependent Claim
118 words
A process for preparing a mold which comprises mixing refractory particles with a powdered binder and water, and forming the resulting mold-making composition into a shaped product, whereafter the shaped product is hardened by blowing CO 2 gas therethrough, said powdered binder comprising an intimate mixture of a copolymer of maleic anhydride with an olefinically unsaturated compound selected from the group consisting of an aliphatic α-olefin having 2 to 8 carbon atoms, styrene and methyl vinyl ether, 0.2 to 2.0 equivalents of a caustic alkali per carboxyl equivalent of said copolymer, and 0.3 to 5.0 parts by weight of an alkaline earth metal hydroxide per 1 part of the total weight of said copolymer and said caustic alkali.
Claim 15
Dependent Claim
118 words
A process for preparing a mold which comprises mixing refractory particles with a powdered binder and water, and forming the resulting mold-making composition into a shaped product, whereafter the shaped product is hardened by blowing CO 2 gas therethrough, said powdered binder comprising an intimate mixture of a copolymer of maleic anhydride with an olefinically unsaturated compound selected from the group consisting of an aliphatic α-olefin having 2 to 8 carbon atoms, styrene and methyl vinyl ether, 0.2 to 2.0 equivalents of a caustic alkali per carboxyl equivalent of said copolymer, and 0.3 to 5.0 parts by weight of an alkaline earth metal hydroxide per 1 part of the total weight of said copolymer and said caustic alkali.
Claim 16
Dependent Claim
13 words
The process of claim 12 wherein said aliphatic α-olefin is ethylene or isobutylene.
Claim 17
Dependent Claim
16 words
The process of claim 12 said copolymer has a molecular weight of 17×10 4 or less.
Claim 18
Dependent Claim
13 words
The process of claim 12 wherein said caustic alkali is NaOH or KOH.
Claim 19
Dependent Claim
15 words
The process of claim 12 wherein said alkaline earth metal hydroxide is Ca(OH) 2 .
Claim 20
Dependent Claim
43 words
The process of claim 12 wherein the powdered binder to be used comprises an intimate mixture of 0.8 to 2.0 parts by weight of said alkaline earth metal hydroxide with 1 part of the total weight of said copolymer and said caustic alkali.
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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) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |