EP0685537A2
Expired / Lapsed
EP
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Aqueous ink composition
Assignee: Sakura Color Products Corp
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Filing: 1995-05-31
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Granted: —
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Expires: 2015-05-31
Abstract
Abstract An aqueous ink composition is provided which includes an aqueous mixture containing at least a coloring agent, a pigment dispersant, a water-soluble organic solvent and water, and an organic white pigment of an alkylene-bis-melamine derivative represented by the general formula (1) : wherein R represents a hydrogen atom, a lower alkyl group having 1 to 4 carbon atoms or an alicyclic group ; R1, R2, R3 and R4 are the same or different, each representing a hydrogen atom or a lower alkyl group having 1 to 4 carbon atoms ; R1 and R2, or R3 and R4 may form a heterocyclic group together with a nitrogen atom ; and X represents a lower alkylene group having 2 to 3 carbon atoms. The aqueous ink composition is particularly useful for writing instruments of direct ink supply type and of wick type.
Inventors
- 👤 Toshimitsu C/O Sakura Color Prod. Corp. Kawasumi
- 👤 Hiroaki Ueda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 06:43
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/16; C09D11/17
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
114 words
An aqueous ink composition comprising an aqueous ink mixture containing at least a coloring agent, a pigment dispersant, a water-soluble organic solvent and water, and an organic white pigment of an alkylene-bis-melamine derivative represented by the general formula (1): wherein R represents a hydrogen atom, a lower alkyl group having 1 to 4 carbon atoms or an alicyclic group; R1, R2, R3 and R4 are the same or different, each representing a hydrogen atom or a lower alkyl group having 1 to 4 carbon atoms; R1 and R2, or R3 and R4 may form a heterocyclic group together with nitrogen atom; and X represents a lower alkylene group having 2 to 3 carbon atoms.
Claim 2
Dependent Claim
114 words
An aqueous ink composition comprising an aqueous ink mixture containing at least a coloring agent, a pigment dispersant, a water-soluble organic solvent and water, and an organic white pigment of an alkylene-bis-melamine derivative represented by the general formula (1): wherein R represents a hydrogen atom, a lower alkyl group having 1 to 4 carbon atoms or an alicyclic group; R1, R2, R3 and R4 are the same or different, each representing a hydrogen atom or a lower alkyl group having 1 to 4 carbon atoms; R1 and R2, or R3 and R4 may form a heterocyclic group together with nitrogen atom; and X represents a lower alkylene group having 2 to 3 carbon atoms.
Claim 3
Dependent Claim
18 words
An aqueous ink composition as set forth in claim 1, wherein said organic white pigment is ethylene-bis- melamine.
Claim 4
Dependent Claim
17 words
An aqueous ink composition as set forth in claim 1, wherein said coloring agent is a pigment.
Claim 5
Dependent Claim
16 words
An aqueous ink composition as set forth in claim 3, wherein said pigment is titanium oxide.
Claim 6
Dependent Claim
23 words
An aqueous ink composition as set forth in claim 1 or claim 2, wherein said coloring agent is a fluorescent colored resin emulsion.
Claim 7
Dependent Claim
35 words
An aqueous ink composition as set forth in any one of claims 1 to 5, wherein said pigment dispersant is selected from an alkali salt, ammonia salt and amine salt of a-methylstyrene-styrene acrylic acid copolymer.
Claim 8
Dependent Claim
28 words
Awriting instrument of direct ink supply type comprising an ink container directly charged with an aqueous ink composition as recited in any one of claims 1 to 6.
Claim 9
Dependent Claim
47 words
A writing instrument as set forth in claim 7, wherein said aqueous ink composition includes about 1 % to about 20 % by weight of an organic white pigment as recited in claim 1 or claim 2 with respect to the total amount of said ink composition.
Claim 10
Dependent Claim
25 words
A writing instrument of wick type comprising a wick impregnated with an aqueous ink composition as recited in any one of claims 1 to 6.
Claim 11
Dependent Claim
46 words
A writing instrument as set forth in claim 9, wherein said ink composition includes about 1 % to about 40 % by weight of an organic white pigment as recited in claim 1 or claim 2 with respect to the total amount of said ink composition.
References Cited (Backward Citations)
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