Patent US3873492A successfully refreshed from Google Patents.
US3873492A
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Gypsum compositions for gypsum-thermoplastic composite
Assignee: Japan Atomic Energy Agency
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Filing: 1972-11-22
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Granted: 1975-03-25
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Expires: 1992-11-22
Abstract
Abstract A gypsum composition having affinity for a thermoplastic resin is obtained by adhering a polysulfone resins to the surface of a gypsum powder. The composition is suitable for preparing a gypsum-thermoplastic resin composite.
Inventors
- 👤 Masaaki Takehisa
- 👤 Hirondo Kurihara
- 👤 Toshiaki Yagi
- 👤 Hiromasa Watanabe
- 👤 Sueo Machi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:06
CPC Classifications
C; C04; C04B; C04B26/00; C04B26/02; C04B26/04; C04B26/045; C04B20/00; C04B20/10; C04B20/1018; C04B20/1029; C04B20/1037; C04B28/00; C04B28/14; C08; C08F; C08F292/00; C08K; C08K9/00; C08K9/08; C09; C09C; C09C1/00; C09C1/02; C09C1/025; C01; C01P; C01P2006/00; C01P2006/60; C01P2006/90
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
76 words
A METHOD OF IMPARTING PROPERTIES SUITABLE FOR PREPARING A GYPSUM - THERMOPLASTIC RESIN COMPOSITE TO A GYPSUM POWDER, COMPRISING ADHERING A POLYSULFONE RESIN TO THE SURFACE OF EACH PARTICLE OF SAID POWDER, SAID POLYSULFONE RESIN BEING A POLYMER HAVING -SO2- GROUPS IN THE MAIN POLYMERIC CHAIN THEREOF AND BEING A REACTION PRODUCT OF SO2 AND A MONOMER SELECTED FROM THE GROUP CONSISTING OF OLEFINS OF 2-12 CARBON ATOMS, STYRENE, VINYL CHLORIDE, ALLYL CHLORIDE, AND COMBINATIONS THEREOF.
Claim 2
Independent Claim
76 words
A METHOD OF IMPARTING PROPERTIES SUITABLE FOR PREPARING A GYPSUM - THERMOPLASTIC RESIN COMPOSITE TO A GYPSUM POWDER, COMPRISING ADHERING A POLYSULFONE RESIN TO THE SURFACE OF EACH PARTICLE OF SAID POWDER, SAID POLYSULFONE RESIN BEING A POLYMER HAVING -SO2- GROUPS IN THE MAIN POLYMERIC CHAIN THEREOF AND BEING A REACTION PRODUCT OF SO2 AND A MONOMER SELECTED FROM THE GROUP CONSISTING OF OLEFINS OF 2-12 CARBON ATOMS, STYRENE, VINYL CHLORIDE, ALLYL CHLORIDE, AND COMBINATIONS THEREOF.
Claim 3
Dependent Claim
34 words
A method in accordance with claim 1, in which said polysulfone resin is adhered to the surface of the gypsum by copolymerizing sulfur dioxide and said monomer on the surface of the gypsum powder.
Claim 4
Dependent Claim
35 words
A method in accordance with claim 1, in which said polysulfone resin is adhered to the surface of the gypsum by treating the surface of the gypsum powder with a solution of said polysulfone resin.
Claim 5
Dependent Claim
55 words
A method in accordance with claim 1, in which said polysulfone resin is adhered to the surface of the gypsum by treating the surface of the gypsum powder with a solution of said polysulfone resin in at least one unreacted monomer selected from an olefin, a vinyl monomer, an allyl compound monomer and sulfur dioxide.
Claim 6
Dependent Claim
19 words
A method in accordance with claim 1, in which said monomer is an olefin monomer having 2-12 carbon atoms.
Claim 7
Dependent Claim
20 words
A method in accordance with claim 5 in which said olefin is an Alpha -olefin having from 2-8 carbon atoms.
Claim 8
Dependent Claim
80 words
A gypsum composition having increased affinity for thermoplastic resins, which can be used for preparing a gypsum-thermoplastic resin composite, comprising a gypsum powder and a polysulfone resin adhered to the surface of each particle of said powder, said polysulfone resin being a polymer having -SO2-groups in the main polymeric chain thereof and being a reaction product of SO2 and a monomer selected from the group consisting of olefins of 2-12 carbon atoms, styrene, vinyl chloride, allyl chloride, and combinations thereof.
Claim 9
Dependent Claim
80 words
A gypsum composition having increased affinity for thermoplastic resins, which can be used for preparing a gypsum-thermoplastic resin composite, comprising a gypsum powder and a polysulfone resin adhered to the surface of each particle of said powder, said polysulfone resin being a polymer having -SO2-groups in the main polymeric chain thereof and being a reaction product of SO2 and a monomer selected from the group consisting of olefins of 2-12 carbon atoms, styrene, vinyl chloride, allyl chloride, and combinations thereof.
Claim 10
Dependent Claim
20 words
A gypsum composition in accordance with claim 7 in which said monomer is an olefin monomer having 2-12 carbon atoms.
Claim 11
Dependent Claim
21 words
A gypsum composition in accordance with claim 8 in which said olefin is an Alpha -olefin having from 2-8 carbon atoms.
Claim 12
Dependent Claim
35 words
A gypsum-thermoplastic resin composite comprising a mixture of a gypsum composition in accordance with claim 7 and a polyolefin said polyolefin being present in an amount of 95-5% by weight gypsum in the resultant composite.
Claim 13
Dependent Claim
30 words
A method of producing the gypsum-thermoplastic resin composite of claim 10 comprising blending said gypsum with said polyolefin in an amount of 95-5% by weight gypsum in the resulting composite.
References Cited (Backward Citations)
US2745813A
Cited
US2993799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |