US5776232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emulsion ink for stencil printing
Assignee: Riso Kagaku Corp
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Filing: 1997-03-14
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Granted: 1998-07-07
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Expires: 2017-03-14
Abstract
Abstract A water-in-oil (W/O) emulsion ink for stencil printing is provided, which contains a water-insoluble colorant in the water phase, has the water phase dispersed finely and stably in the oil phase, and can provide prints high in printing density and glossiness. The water-insoluble colorant has an average particle size of 1 mu m or less, and is constituted by particles of 1 mu m or less in particle size in an amount of 50% or more on area basis of the total of the water-insoluble colorant. The emulsion ink is preferably formed by use of an emulsifier having an HLB of 1.5-6.0, and preferably contains a tertiary amine compound in the water phase as a dispersant for the water-insoluble colorant.
Inventors
- 👤 Sadanao Okuda
- 👤 Masato Ishikawa
- 👤 Takashi Suzuki
- 👤 Yoshihiro Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:58
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/02; C09D11/023; C09D11/0235
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
71 words
A water-in-oil (W/O) emulsion ink for stencil printing comprising an oil phase and a water phase, wherein a water-insoluble colorant is contained in said water phase, said water-insoluble colorant having an average particle size of 1 μm or less, and wherein water-insoluble colorant particles of 1 μm or less in particle size are present in an amount of 50% or more on area basis of the total of said water-insoluble colorant.
Claim 2
Dependent Claim
71 words
A water-in-oil (W/O) emulsion ink for stencil printing comprising an oil phase and a water phase, wherein a water-insoluble colorant is contained in said water phase, said water-insoluble colorant having an average particle size of 1 μm or less, and wherein water-insoluble colorant particles of 1 μm or less in particle size are present in an amount of 50% or more on area basis of the total of said water-insoluble colorant.
Claim 3
Dependent Claim
26 words
The emulsion ink for stencil printing of claim 1, comprising an emulsifier added to said oil phase, said emulsifier having an HLB of 1.5 to 6.0.
Claim 4
Dependent Claim
21 words
The emulsion ink for stencil printing of claim 2, comprising a tertiary amine compound as a dispersant in said water phase.
Claim 5
Dependent Claim
52 words
The emulsion ink for stencil printing of claim 1, in which said water-insoluble colorant has an average particle size of 0.5 μm or less, and particles of 1 μm or less in particle size are present in amount of 90% or more on area basis of the total of said water-insoluble colorant.
Claim 6
Dependent Claim
30 words
The emulsion ink for stencil printing of claim 4, said emulsion ink further comprising an emulsifier added to said oil phase, said emulsifier having an HLB of 1.5 to 6.0.
Claim 7
Dependent Claim
26 words
The emulsion ink for stencil printing of claim 5, wherein said emulsion ink further comprises a tertiary amine compound as a dispersant in said water phase.
Claim 8
Dependent Claim
19 words
The emulsion ink for stencil printing of claim 2, wherein said emulsifier has an HLB of 2.0 to 4.0.
Claim 9
Dependent Claim
19 words
The emulsion ink for stencil printing of claim 5, wherein said emulsifier has an HLB of 2.0 to 4.0.
Claim 10
Dependent Claim
22 words
The emulsion ink for stencil printing of claim 3, wherein said tertiary amine compound is a polymer compound having a tertiary amine.
Claim 11
Dependent Claim
22 words
The emulsion ink for stencil printing of claim 6, wherein said tertiary amine compound is a polymer compound having a tertiary amine.
Claim 12
Dependent Claim
25 words
The emulsion ink for stencil printing of claim 1, wherein said average particle size of said water-insoluble colorant is 0.01 to 0.5 μm or less.
Claim 13
Dependent Claim
40 words
The emulsion ink for stencil printing of claim 1, wherein said particles of 1 μm or less in particle size are present in an amount of 60% or more on an area basis of the total of said water-insoluble colorant.
Claim 14
Dependent Claim
16 words
The emulsion ink for stencil printing of claim 2, wherein said emulsifier is a nonionic surfactant.
Claim 15
Dependent Claim
16 words
The emulsion ink for stencil printing of claim 5, wherein said emulsifier is a nonionic surfactant.
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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) | 2001-07-06 | 2002-01-05 | 2002-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-06 | 2006-01-05 | 2006-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-06 | 2010-01-05 | 2010-07-07 | $7700.00 | Window Closed / Lapsed |