Patent US4148781A successfully refreshed from Google Patents.
US4148781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible building sheet materials
Assignee: Kuraray Co Ltd
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Filing: 1977-07-27
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Granted: 1979-04-10
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Expires: 1997-07-27
Abstract
Abstract A flexible building sheet product is prepared by dry molding a slurry comprising predominantly at least one binder component selected from the group consisting of thermoplastic resin emulsions and aqueous solutions of water-soluble polymers, said solutions containing cross-linking agents for said water-soluble polymers, and a matrix component comprising a calcium sulfate dihydrate powder.
Inventors
- 👤 Hiroshi Narukawa
- 👤 Yasuhira Takeuchi
- 👤 Koichi Saito
- 👤 Yoshio Ohfuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:26
CPC Classifications
C; C04; C04B; C04B26/00; C04B26/02; C04B26/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
A method of manufacturing a building sheet product which comprises: adding calcium sulfate dihydrate power to a thermoplastic resin emulsion containing a suitable amount of water and other additive if desired, gradually preparing a slurry by mixing and stirring said mixture; defoaming or regulating the cell-size of said slurry; molding said slurry into a sheet; drying the sheet; and subjecting the dried sheet to a heat-treatment such that the thermoplastic resin particles within the sheet are fused together to anchor the calcium sulfate dihydrate powder in position.
Claim 2
Independent Claim
87 words
A method of manufacturing a building sheet product which comprises: adding calcium sulfate dihydrate power to a thermoplastic resin emulsion containing a suitable amount of water and other additive if desired, gradually preparing a slurry by mixing and stirring said mixture; defoaming or regulating the cell-size of said slurry; molding said slurry into a sheet; drying the sheet; and subjecting the dried sheet to a heat-treatment such that the thermoplastic resin particles within the sheet are fused together to anchor the calcium sulfate dihydrate powder in position.
Claim 3
Dependent Claim
18 words
The method of claim 1, wherein a vinyl acetate-based resin emulsion is employed as said thermoplastic resin emulsion.
Claim 4
Dependent Claim
21 words
The method of claim 1, which further comprises: incorporating short lengths of an inorganic fiber into the preparation of said slurry.
Claim 5
Dependent Claim
53 words
The method of claim 1, wherein a reinforcement material selected from the group consisting of paper, a nonwoven fabric, a woven fabric, glass mat, glass cloth, asbestos paper, cheese cloth and gauze is employed as a substrate when molding said slurry thereby obtaining a sheet which includes said reinforcement as an integral member.
Claim 6
Independent Claim
75 words
A method of producing a building sheet product which comprises: adding calcium sulfate dihydrate powder to an aqueous solution containing a water-soluble polymer and a cross-linking agent for said polymer, said solution containing at least one other additive if desired; gradually preparing a slurry by mixing and stirring said mixture; defoaming or regulating the cell-size of said slurry; molding the slurry into a sheet, drying said sheet and subjecting the same to a water-in-solubilization treatment.
Claim 7
Independent Claim
75 words
A method of producing a building sheet product which comprises: adding calcium sulfate dihydrate powder to an aqueous solution containing a water-soluble polymer and a cross-linking agent for said polymer, said solution containing at least one other additive if desired; gradually preparing a slurry by mixing and stirring said mixture; defoaming or regulating the cell-size of said slurry; molding the slurry into a sheet, drying said sheet and subjecting the same to a water-in-solubilization treatment.
Claim 8
Dependent Claim
37 words
The method of claim 5, wherein a polyvinyl alcohol-based polymer is employed as said water-soluble polymer and a metal compound capable of forming a complex compound with said polyvinyl alcohol-based polymer is employed as said cross-linking agent.
Claim 9
Dependent Claim
21 words
The method of claim 5, which further comprises: incorporating short lengths of an inorganic fiber into the preparation of said slurry.
Claim 10
Dependent Claim
53 words
The method of claim 5, wherein a reinforcement material selected from the group consisting of paper, nonwoven fabric, woven fabric, glass paper, glass mat, glass cloth, asbestos paper, cheese cloth and guaze is employed as a substrate when molding said slurry thereby obtaining a sheet which includes said reinforcement as an integral member.
Claim 11
Dependent Claim
12 words
The flexible building sheet product produced by the process of claim 1.
Claim 12
Dependent Claim
12 words
The flexible building sheet product produced by the process of claim 5.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |