US5126010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink-jet recording sheet
Assignee: New Oji Paper Co Ltd
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Filing: 1990-11-21
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Granted: 1992-06-30
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Expires: 2010-11-21
Abstract
Abstract An ink-jet recording sheet that contains as main ingredients 69-95% wood pulp and 4-30 wt % precipitated calcium carbonate and which has a Stöckigt sizing degree of 2-25 seconds as measured for a basis weight of 64 g/m2, or a Stöckigt sizing degree ranging from 5x(basis weight/64)2 to 25x(basis weight/64)2 at a water extracting pH of 4.5-7.5. This sheet allows a clear color to develop and provides an image having circular dots and sharply defined edges. This sheet may also incorporate a cationic synthetic polymer and an alkylketene dimer.
Inventors
- 👤 Akira Kobayashi
- 👤 Makiko Tokita
- 👤 Masahiro Nakagawa
- 👤 Kenji Yasuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:03
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/675; B; B41; B41M; B41M5/00; B41M5/50; B41M5/52; B41M5/5245; D21H17/03; D21H17/05; D21H17/17; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45; D21H17/455; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/3179
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
171 words
An ink-jet recording sheet for producing high resolution images comprising a base layer and a surface layer, said base layer comprising as main ingredients 69-95 wt % of wood pulp and 4-30 wt % of precipitated calcium carbonate, wherein said precipitated calcium carbonate is calcite comprising particles at least 70% of which have a particle size of 0.5-1.5 μm and which has an oil absorbency of 10-80 ml/100 g, and said base layer further comprising an alkylketene dimer and a cationic synthetic polymer, wherein said cationic synthetic polymer is selected from the group consisting of a cationic surfactant copolymer having a hydrocarbon group of C 4-28 and a polymerizable functional group, and a copolymer of a cationic monomer with a nonionic monomer, said surface layer comprising a polyvinyl alcohol with no more than 95 mol % saponification in an amount of 0.2-5.0 g/m 2 , and said-ink jet recording sheet having a Stockigt sizing degree of 2-25 seconds relative to a paper having a basis weight of 64 g/m 2 .
Claim 2
Dependent Claim
171 words
An ink-jet recording sheet for producing high resolution images comprising a base layer and a surface layer, said base layer comprising as main ingredients 69-95 wt % of wood pulp and 4-30 wt % of precipitated calcium carbonate, wherein said precipitated calcium carbonate is calcite comprising particles at least 70% of which have a particle size of 0.5-1.5 μm and which has an oil absorbency of 10-80 ml/100 g, and said base layer further comprising an alkylketene dimer and a cationic synthetic polymer, wherein said cationic synthetic polymer is selected from the group consisting of a cationic surfactant copolymer having a hydrocarbon group of C 4-28 and a polymerizable functional group, and a copolymer of a cationic monomer with a nonionic monomer, said surface layer comprising a polyvinyl alcohol with no more than 95 mol % saponification in an amount of 0.2-5.0 g/m 2 , and said-ink jet recording sheet having a Stockigt sizing degree of 2-25 seconds relative to a paper having a basis weight of 64 g/m 2 .
Claim 3
Dependent Claim
21 words
An ink-jet recording sheet according to claim 1 which contains the alkylketene dimer in an amount of 0.05-0.5 g/m 2 .
Claim 4
Dependent Claim
19 words
An ink-jet recording sheet according to claim 1 wherein the cationic synthetic polymer is a dimethyldiallyl ammonium chloride copolymer.
Claim 5
Dependent Claim
187 words
An ink-jet recording sheet for producing high resolution images comprising a base layer and a surface layer, said base layer comprising as main ingredients 69-95 wt % of wood pulp and 4-30 wt % of precipitated calcium carbonate, wherein said precipitated calcium carbonate is calcite comprising particles at least 70% of which have a particle size of 0.5-1.5 μm and which has an oil absorbency of 10-80 ml/100 g, and said base layer further comprising an alkylketene dimer and a cationic synthetic polymer, wherein said cationic synthetic polymer is selected from the group consisting of a cationic surfactant copolymer having a hydrocarbon group of C 4-28 and a polymerizable functional group, and a copolymer of a cationic monomer with a nonionic monomer, said surface layer comprising a polyvinyl alcohol with no more than 95 mol % saponification in an amount of 0.2-5.0 g/m 2 , and said ink-jet recording sheet having a Stockigt sizing degree of 5×(basis weight of said recording sheet/64) 2 to 25×(basis weight of said recording sheet/64) 2 and a water extracting pH of 4.5-7.5 as measured by the method specified in JIS P8133.
Claim 6
Dependent Claim
187 words
An ink-jet recording sheet for producing high resolution images comprising a base layer and a surface layer, said base layer comprising as main ingredients 69-95 wt % of wood pulp and 4-30 wt % of precipitated calcium carbonate, wherein said precipitated calcium carbonate is calcite comprising particles at least 70% of which have a particle size of 0.5-1.5 μm and which has an oil absorbency of 10-80 ml/100 g, and said base layer further comprising an alkylketene dimer and a cationic synthetic polymer, wherein said cationic synthetic polymer is selected from the group consisting of a cationic surfactant copolymer having a hydrocarbon group of C 4-28 and a polymerizable functional group, and a copolymer of a cationic monomer with a nonionic monomer, said surface layer comprising a polyvinyl alcohol with no more than 95 mol % saponification in an amount of 0.2-5.0 g/m 2 , and said ink-jet recording sheet having a Stockigt sizing degree of 5×(basis weight of said recording sheet/64) 2 to 25×(basis weight of said recording sheet/64) 2 and a water extracting pH of 4.5-7.5 as measured by the method specified in JIS P8133.
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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) | 1995-06-30 | 1995-12-30 | 1996-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-30 | 1999-12-30 | 2000-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-30 | 2003-12-30 | 2004-06-30 | $7700.00 | Window Closed / Lapsed |