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US3950295A
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Method of preparing a composition containing gypsum, a vinyl monomer and sulfite ion
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1974-02-01
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Granted: 1976-04-13
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Expires: 1994-02-01
Abstract
Abstract A hardenable molding composition comprising hydratable gypsum, a vinyl monomer, a source of hydrogen sulfite ions and water is disclosed. With this molding composition a hardened product can be obtained having high strength due to the combined effect of the hydraulic reaction of the gypsum and the polymerization reaction of the vinyl monomer.
Inventors
- 👤 Tadashi Yamaguchi
- 👤 Takayuki Ono
- 👤 Hiroshi Hoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:56
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A method of preparing a gypsum vinyl polymer composite which comprises forming a mixture consisting essentially of hydratable gypsum powder, about 1-15 parts per 100 parts of said gypsum of a vinyl monomer, about 40-80 parts per 100 parts of said gypsum of water, and about 0.1-100 parts, calculated as sulfur dioxide, per 100 parts of vinyl monomer of a source of hydrogen sulfite ions as the essential polymerization agent for said vinyl monomer and allowing said mixture to harden by simultaneous polymerization of said monomer and hydration of said gypsum, said parts all being by weight.
Claim 2
Independent Claim
97 words
A method of preparing a gypsum vinyl polymer composite which comprises forming a mixture consisting essentially of hydratable gypsum powder, about 1-15 parts per 100 parts of said gypsum of a vinyl monomer, about 40-80 parts per 100 parts of said gypsum of water, and about 0.1-100 parts, calculated as sulfur dioxide, per 100 parts of vinyl monomer of a source of hydrogen sulfite ions as the essential polymerization agent for said vinyl monomer and allowing said mixture to harden by simultaneous polymerization of said monomer and hydration of said gypsum, said parts all being by weight.
Claim 3
Dependent Claim
24 words
The method of claim 11 wherein a vinyl polymer emulsion in sufficient amount to suppress volatilization of said monomer is added to said mixture.
Claim 4
Dependent Claim
16 words
A method according to claim 7 wherein said vinyl monomer is methyl methacrylate, styrene, or acrylonitrile.
Claim 5
Dependent Claim
19 words
A method according to claim 1 wherein said vinyl monomer is a mixture of methyl methacrylate and methyl acrylate.
Claim 6
Dependent Claim
19 words
A method according to claim 2 wherein said polymer emulsion is a mixture of polyvinylidene chloride and polyvinyl chloride.
Claim 7
Independent Claim
85 words
A method of molding which comprises mixing into a paste hydratable gypsum powder, about 1-15 parts per 100 parts of said gypsum of a vinyl monomer, sufficient water to hydrate said gypsum, and sufficient amount of a source of hydrogen sulfite ions to effect polymerization of said monomer, molding said paste to the desired configuration and allowing the thus-molded paste to harden whereby the hardened product exhibits strength characteristics contributed by both the hydration of said gypsum and the in situ polymerization of said monomer.
Claim 8
Independent Claim
85 words
A method of molding which comprises mixing into a paste hydratable gypsum powder, about 1-15 parts per 100 parts of said gypsum of a vinyl monomer, sufficient water to hydrate said gypsum, and sufficient amount of a source of hydrogen sulfite ions to effect polymerization of said monomer, molding said paste to the desired configuration and allowing the thus-molded paste to harden whereby the hardened product exhibits strength characteristics contributed by both the hydration of said gypsum and the in situ polymerization of said monomer.
Claim 9
Dependent Claim
49 words
The method of claim 6 wherein said water is present in the range of 40-80 parts by weight per 100 parts by weight of said gypsum, and said ion source is present in the range of about 0.01-500 parts by weight per 100 parts by weight of said monomer.
References Cited (Backward Citations)
US2990382A
Cited
US3437619A
Cited
GB1014795A
Cited
DE1471481A1
Cited
JPS411274Y1
Cited
US3591542A
Cited
US3487038A
Cited
JPS444215Y1
Cited
GB1150376A
Cited
US3661620A
Cited
US3856745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |