US3912542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing laminated sheet-like material
Assignee: Nippon Sheet Glass Co Ltd
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Filing: 1973-06-29
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Granted: 1975-10-14
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Expires: 1993-06-29
Abstract
Abstract A method of producing a laminated sheet-like material, which comprises interposing an adhesive powdery thermoplastic resin composition or an air-permeable sintered product thereof between at least two sheet-like materials to form an assembly, maintaining the assembly at reduced pressure to deaerate the adhesive layer, and heating the assembly while maintaining it at reduced pressure at least at the intial stage of heating thereby to melt the powdery thermoplastic resin composition or the sintered product and bond the sheet-like materials to provide an integral body.
Inventors
- 👤 Jiro Hirano
- 👤 Toshio Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:40
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/10788; B32B13/00; B32B13/04; B32B17/10009; B32B17/10036; B32B17/10165; B32B17/10247; B32B17/10807; B32B17/10816; B32B17/10825; B32B17/10834; B32B17/10844; B32B17/10899; B32B17/10944; B32B27/00; B32B27/06; B32B37/00; B32B37/10; B32B37/1009; B32B7/00; B32B7/04; B32B7/12; C; C03; C03C; C03C27/00; C03C27/06; C03C27/10; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/414; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2309/00; B32B2309/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
112 words
A METHOD OF PRODUCING A LAMINATED SHEET-LIKE MATERIAL, WHICH COMPRISES INTERPOSING AN ADHENSIVE LAYER COMPOSED OF A PREFORMED AIR-PERMEABLE SINTERED SHEET OF A POWDERY THERMOPLASTIC RESIN COMPOSITION BETWEEN AT LEAST TWO SHEET LIKE MATERIALS TO FORM AN ASSEMBLY, MAINTAINING THE ASSEMBLY UNDER REDUCED PRESSURE TO DEAERATE THE ADHENSIVE LAYER AND TO PRESS THE ASSEMBLY BY THE DIFFERENCE OF PRESSURE BETWEEN THE REDUCED PRESSURE AND ATMOSPHERIC PRESSURE, AND HEATING THE ASSEMBLY AT A TEMPERATURE HIGHER THAN THE SOFTENING POINT OF THE THERMOPLASTIC RESIN, WHILE MAINTAINING THE REDUCED PRESSURE DURING AT LAST THE INITIAL STAGE OF HEATING THEREBY TO MELT THE SINTERED SHEET AND BOND THE SHEET LIKE MATERIALS TO PROVIDE AN INTEGERAL BODY.
Claim 2
Independent Claim
112 words
A METHOD OF PRODUCING A LAMINATED SHEET-LIKE MATERIAL, WHICH COMPRISES INTERPOSING AN ADHENSIVE LAYER COMPOSED OF A PREFORMED AIR-PERMEABLE SINTERED SHEET OF A POWDERY THERMOPLASTIC RESIN COMPOSITION BETWEEN AT LEAST TWO SHEET LIKE MATERIALS TO FORM AN ASSEMBLY, MAINTAINING THE ASSEMBLY UNDER REDUCED PRESSURE TO DEAERATE THE ADHENSIVE LAYER AND TO PRESS THE ASSEMBLY BY THE DIFFERENCE OF PRESSURE BETWEEN THE REDUCED PRESSURE AND ATMOSPHERIC PRESSURE, AND HEATING THE ASSEMBLY AT A TEMPERATURE HIGHER THAN THE SOFTENING POINT OF THE THERMOPLASTIC RESIN, WHILE MAINTAINING THE REDUCED PRESSURE DURING AT LAST THE INITIAL STAGE OF HEATING THEREBY TO MELT THE SINTERED SHEET AND BOND THE SHEET LIKE MATERIALS TO PROVIDE AN INTEGERAL BODY.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein said sheet-like material is selected from the group consisting of glass sheets, asbestos cement plates, plaster board and synthetic resin sheets.
Claim 4
Dependent Claim
35 words
The method of claim 1 wherein said adhesive thermoplastic resin is selected from the group consisting of an ethylene/vinyl acetate copolymer, polyvinyl acetate, a polyvinyl butyral resin, a butyl methacrylic resin, polyamide resins, and polyisobutylene.
Claim 5
Dependent Claim
30 words
The method of claim 1 wherein said preformed air-permeable sheet is made by sintering a powdery thermoplastic resin composition having an average particle diameter of not more than 14 mesh.
Claim 6
Dependent Claim
19 words
The method of claim 1 wherein said preformed air-permeable sintered sheet has a bulk density of 0.2 to 0.4.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein said assembly is maintained under reduced pressure of nOt more than -650 mmHg gauge.
Claim 8
Dependent Claim
46 words
The method of claim 1 wherein said assembly is placed in a vacuum bag or pressure reduction chamber composed of at least a partly flexible gas-tight sheet, and the vacuum bag or pressure reduction chamber is evacuated and maintained under reduced pressure thereby to perform deaeration.
Claim 9
Dependent Claim
28 words
The method of claim 1 wherein said initial heating is performed at a temperature 10* to 50*C higher than the softening point of the adhesive thermoplastic resin used.
Claim 10
Dependent Claim
62 words
The method of claim 8 wherein said heating of the assembly is carried out in two stages: a. heating said assembly under the deaerated state until the thermoplastic resin composition is softened, and b. releasing the reduced pressure and then further heating the assembly at a temperature which is 0 to 30*C higher than the temperature of heating in the stage (a).
Claim 11
Dependent Claim
26 words
The method of claim 1 wherein during the heating under the deaerated state, the assembly is pressed with a pressure of 0.8 kg/cm2 to 1.0 kg/cm2.
Claim 12
Dependent Claim
120 words
The method of claim 1 wherein said assembly is placed in a pressure reduction chamber made of an at least partly flexible and gas-tight sheet and a pressure buffering frame having a thickness larger than the thickness of the assembly and encircling the assembly, the pressure reduction chamber is evacuated to deaerate the adhesive layer and to press the assembly by the difference of pressure between the reduced pressure and atmospheric pressure, and said assembly is heated at a temperature higher than the softening point of the thermoplastic resin, while maintaining the deaerated state during at least the initial stage of heating thereby to melt the preformed air-permeable sintered sheet and bond the sheet-like material to provide an integral body.
Claim 13
Independent Claim
162 words
A method of producing a laminated sheet-like material including a decorative material, which comprises interposing an adhesive layer composed of a preformed air-permeable sintered sheet of a powdery thermoplastic resin composition between a plurality of sheet-like materials at least one of which is a transparent of semi-transparent sheet-like material, thereby to form an assembly, incorporating a decorative sheet in the adhesive layer in contact with the transparent or semi-transparent sheet-like material or placing it on the surface of the adhesive layer, maintaining the assembly under reduced pressure to deaerate said adhesive layer and to press the assembly by the difference of pressure between the reduced pressure and atmospheric pressure, and heating the assembly at a temperature higher than the softening point of the thermoplastic resin, while maintaining this reduced pressure during at least the initial stage of heating thereby to melt the thermoplastic resin composition powder of the preformed air-permeable sintered sheet and bond the sheet-like materials to provide an integral body.
Claim 14
Independent Claim
162 words
A method of producing a laminated sheet-like material including a decorative material, which comprises interposing an adhesive layer composed of a preformed air-permeable sintered sheet of a powdery thermoplastic resin composition between a plurality of sheet-like materials at least one of which is a transparent of semi-transparent sheet-like material, thereby to form an assembly, incorporating a decorative sheet in the adhesive layer in contact with the transparent or semi-transparent sheet-like material or placing it on the surface of the adhesive layer, maintaining the assembly under reduced pressure to deaerate said adhesive layer and to press the assembly by the difference of pressure between the reduced pressure and atmospheric pressure, and heating the assembly at a temperature higher than the softening point of the thermoplastic resin, while maintaining this reduced pressure during at least the initial stage of heating thereby to melt the thermoplastic resin composition powder of the preformed air-permeable sintered sheet and bond the sheet-like materials to provide an integral body.
Claim 15
Dependent Claim
30 words
The method of claim 12 wherein said decorative sheet is selected from the group consisting of metal foils, synthetic resin films, knitted and woven fabrics, non-woven fabrics, paper and wire.
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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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |