US3855056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing synthetic pulp-like materials and producing synthetic papers therefrom
Assignee: Resonac Corp
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Filing: 1970-03-17
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Granted: 1974-12-17
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Expires: 1990-03-17
Abstract
Abstract Synthetic pulp-like materials are produced by forming into a film a mixed resin comprising at least one orientable thermoplastic resin and at least one thermoplastic resin incompatible or poorly compatible with said orientable resin, stretching the film at a temperature ranging from the softening point of the film to the melting point thereof or a temperature at which an apparent fluidity is shown, then cutting the resultant film in an adequate length to prepare flinders, and fibrillating the flinders by applying a mechanical force thereto. Synthetic papers are produced by forming said synthetic pulplike materials into the determined shape by paper-making, heating and pressurizing the resultant shaped article with or without treating the resultant shaped article with a liquid or gas having no ability of dissolving the orientable thermoplastic resin but having an ability of dissolving or swelling the thermoplastic resin incompatible or poorly compatible with said resin. These synthetic papers are excellent in mechanical properties as well as in writability and printability.
Inventors
- 👤 T Okamura
- 👤 S Nagahama
- 👤 Y Maeda
- 👤 M Asaoka
- 👤 H Iigaya
- 👤 M Nakano
- 👤 K Takaki
- 👤 Y Masubuchi
- 👤 Y Yamaguchi
- 👤 I Hoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:35
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H5/20; B; B29; B29D; B29D7/00; B29D7/01; D01; D01D; D01D5/00; D01D5/42; D01D5/423; Y; Y10; Y10S; Y10S264/00; Y10S264/47
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
101 words
A PROCESS FOR PRODUCING A PULP-LIKE MATERIAL, WHICH COMPRISES FORMING INTO A FILM A MIXED RESIN COMPRISING AT LEAST ONE ORIENTABLE THERMOPLASTIC RESIN AND AT LEAST ONE THERMOPLASTIC RESIN INCOMPATIBLE OR POORLY COMPATIBLE WITH SAID ORIENTABLE THERMOPLASTIC RESIN, HIGHLY STRETCHING THE RESULTANT FILM AT A TEMPERATURE RANGING FROM THE SOFTENING POINT OF THE FILM TO THE MELTING POINT THEREOF, THEN CUTTING THE RESULTANT STRETCHED FILM TO A LENGTH OF 0.2 TO 5CM IN THE STRETCH DIRECTION TO FORM FLINDERS, AND THEN FIBRILLATING THE FLINDERS IN AN INACTIVE LIQUID BY APPLYING A MECHANICAL FORCE TO SAID FLINDERS WITH A PAPER BEATER MEANS.
Claim 2
Dependent Claim
101 words
A PROCESS FOR PRODUCING A PULP-LIKE MATERIAL, WHICH COMPRISES FORMING INTO A FILM A MIXED RESIN COMPRISING AT LEAST ONE ORIENTABLE THERMOPLASTIC RESIN AND AT LEAST ONE THERMOPLASTIC RESIN INCOMPATIBLE OR POORLY COMPATIBLE WITH SAID ORIENTABLE THERMOPLASTIC RESIN, HIGHLY STRETCHING THE RESULTANT FILM AT A TEMPERATURE RANGING FROM THE SOFTENING POINT OF THE FILM TO THE MELTING POINT THEREOF, THEN CUTTING THE RESULTANT STRETCHED FILM TO A LENGTH OF 0.2 TO 5CM IN THE STRETCH DIRECTION TO FORM FLINDERS, AND THEN FIBRILLATING THE FLINDERS IN AN INACTIVE LIQUID BY APPLYING A MECHANICAL FORCE TO SAID FLINDERS WITH A PAPER BEATER MEANS.
Claim 3
Dependent Claim
20 words
A process according to claim 1, wherein several films are formed into a bundle and the bundle is highly stretched.
Claim 4
Dependent Claim
57 words
A process according to claim 1, wherein said paper beater means comprises a vessel having rotating blades in which the distance between the blades and the distance between a blade and the wall of the vessel are more than 1 mm and in which the velocity at the end of each blade is more than 5 m./sec.
Claim 5
Dependent Claim
64 words
A process according to claim 1, wherein the mixed resin is a combination of polyethylene and at least one member selected from the group consisting of polystyrene, polyvinyl chloride, polyvinylidene chloride, polyester, polyvinyl alcohol and polyvinyl acetate, or a combination of polypropylene and at least one member selected from the group consisting of polystyrene, polyvinyl chloride, polyvinylidene chloride, polyester, polyvinyl alcohol and polyvinyl acetate.
Claim 6
Dependent Claim
18 words
A process according to claim 1, wherein the resultant film is stretched at least seven times its length.
Claim 7
Dependent Claim
19 words
A process according to claim 5, wherein the resultant film is stretched from seven to 15 times its length.
Claim 8
Dependent Claim
12 words
A process according to claim 1, wherein said inactive liquid is water.
Claim 9
Dependent Claim
71 words
A process for producing a synthetic paper, which comprises forming a pulp-like material obtained in accordance with claim 1 into the determined shape by such a means as paper-making and the like, and treating the resultant shaped article with a gas which has no ability of dissolving at least one orientable thermoplastic resin but has an ability of dissolving or swelling the thermoplastic resin incompatible or poorly compatible with said resin.
Claim 10
Dependent Claim
18 words
A process according to claim 8, wherein heating and pressurizing are effected after the treatment with the gas.
Claim 11
Dependent Claim
72 words
A process for producing a synthetic paper, which comprises forming a pulp-like material obtained in accordance with claim 1 into the determined shape by such a means as paper-making and the like, and heating and pressurizing the resultant shaped article at a temperature lower than the melting point of at least one orientable thermoplastic resin but higher than the softening point of the thermoplastic resin incompatible or poorly compatible with said resin.
Claim 12
Dependent Claim
49 words
A process according to claim 10, wherein, after heating aNd pressurizing, the shaped article is treated with a liquid which has no ability of dissovling at least one orientable thermoplastic resin but has an ability of dissolving or swelling the thermoplastic resin incompatible or poorly compatible with said resin.
Claim 13
Dependent Claim
49 words
A process according to claim 10, wherein, after heating and pressurizing, the shaped article is treated with a gas which has no ability of dissolving at least one orientable thermoplastic resin but has an ability of dissolving or swelling the thermoplastic resin incompatible or poorly compatible with said resin.
Claim 14
Dependent Claim
71 words
A process for producing a synthetic paper, which comprises forming a pulp-like material obtained in accordance with claim 1 into the determined shape by such a means as paper-making and the like, and treating the resultant shaped article with a liquid which has no ability of dissolving at least one orientable thermoplastic resin but has an ability of dissolving or swelling the thermoplastic resin incompatible or poorly compatible with said resin.
Claim 15
Dependent Claim
18 words
A process according to claim 13, wherein heating and pressurizing are effected after the treatment with the liquid.
References Cited (Backward Citations)
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US3097991A
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US3099067A
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US3114670A
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US3177557A
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US3582418A
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US3560318A
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |