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EP0540757A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Water-based recording ink

Assignee: Seiko Epson Corp
•
Filing: 1992-05-21
•
Granted: —
•
Expires: 2012-05-21
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Abstract

Abstract A water-based recording ink comprising water, pigment, a water - soluble homopolymer, and a copolymer having both hydrophobic and hydrophilic parts. This ink can give printed characters excellent in density, lightfasteness and water resistance. Further it has various characteristics required of an ink for ink jet printing, such as prevention of clogging of minute delivery nozzles, excellence in the scratching resistance and tackfreeness of a print, freeness from the aggregation and sedimentation of solid matters such as pigment particles and from a change in the properties even when stored for long at various temperatures, and the ability of the pigment particles, even if aggregated, to disperse again by agitation or the addition of fresh solvent.

Inventors

  • 👤 Junko Seiko Espon Corporation Shimizu
  • 👤 Michinari Seiko Epson Corporation Tsukahara
  • 👤 Nobuyuki Yanase

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-26 04:24
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/21; A61K31/255; A61P; A61P25/00; A61P25/04; A61P25/18; A61P25/28; A61P43/00; C; C07; C07C; C07C309/00; C07C309/63; C07C309/64; C07C309/65; C07D; C07D209/00; C07D209/02; C07D209/04; C07D209/10; C07D209/14; C07D209/16; C07D213/00; C07D213/02; C07D213/04; C07D213/24; C07D213/44; C07D213/46; C07D213/50; C07D221/00; C07D221/02; C07D221/04; C07D221/18; C07D221/22; C07D221/28; C07D223/00; C07D223/14; C07D223/16; C07D307/00; C07D307/77; C07D307/78; C07D307/79; C07D307/81; C07D333/00; C07D333/02; C07D333/04; C07D333/06; C07D333/14; C07D333/20; C07D455/00; C07D455/02; C07D471/00; C07D471/02; C07D471/04; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/324; C09D11/326; Y; Y10; Y10S; Y10S260/00; Y10S260/38

Claims Analysis

Total Claims: 14
Claim 1
Independent Claim 23 words
A water-based recording ink comprising water, a pigment, a water-soluble homopolymer and a copolymer having both a hydrophobic portion and a hydrophilic portion.
Claim 2
Dependent Claim 23 words
A water-based recording ink comprising water, a pigment, a water-soluble homopolymer and a copolymer having both a hydrophobic portion and a hydrophilic portion.
Claim 3
Dependent Claim 18 words
An ink according to claim 1, wherein the homopolymer has an average molecular weight of 10,000 or more.
Claim 4
Dependent Claim 15 words
An ink according to claim 1, wherein the homopolymer is polyvinyl pyrrolidone or polyvinyl alcohol.
Claim 5
Dependent Claim 38 words
An ink according to claim 1, wherein the homopolymer comprises 0.8 to 30 wt.% of the ink and is present in the ink in an amount of 20 wt.% or more based on one part of the pigment.
Claim 6
Dependent Claim 16 words
An ink according to claim 1, wherein the copolymer comprises acrylic acid or acrylate and acrylonitrile.
Claim 7
Dependent Claim 22 words
An ink according to claim 5, which comprises 0.1 to 1.5 wt.% of the copolymer of acrylic acid or acrylate with acrylonitrile.
Claim 8
Dependent Claim 20 words
An ink according to claim 1, which comprise 2 wt.% or more of the homopolymer and the copolymer the ink.
Claim 9
Dependent Claim 19 words
An ink according to claim 1, which further comprises a high - boiling, low-volatile solvent and a monohydric alcohol.
Claim 10
Dependent Claim 34 words
An ink according to claim 9, wherein the high - boiling, low - volatile solvent is selected from the group consisting of glycerin, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol and polyethylene glycol.
Claim 11
Dependent Claim 19 words
An ink according to claim 9, which comprises 0.45 to 20 wt.% of the high - boiling, low-volatile solvent.
Claim 12
Dependent Claim 26 words
An ink according to claim 9, wherein the monohydric alcohol is selected from the group consisting of ethanol, 1 - propanol, 2 - propanol and butanol.
Claim 13
Dependent Claim 16 words
An ink according to claim 9, which comprises 0.5 to 30 wt.% of the monohydric alcohol.
Claim 14
Dependent Claim 17 words
An ink according to claim 1, which comprises 1 to 30 wt.% of the pigment the ink.

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