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US4927801A Expired / Lapsed US ⏱️ 0.0 years remaining

Double crosslinked barrier coating

Assignee: Nashua Corp
•
Filing: 1988-07-12
•
Granted: 1990-05-22
•
Expires: 2008-07-12
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Abstract

Abstract Disclosed is a heat-sensitive recording material useful in the manufacture of thermal paper and thermal labels. The material comprises a cellulosic or other suitable substrate, a thermally imprintable color-producing layer, and a protective layer over the color-producing layer. It may also include a second protective layer and/or a pressure-sensitive adhesive layer, on the surface of the substrate opposite from the color-producing layer, and a releasable liner covering the adhesive layer. The color-producing layer includes a basic, acid-neutralizing agent for both reducing background discoloration during manufacturing and increasing image definition. The protective layer comprises a polymeric binder which is both ionically and covalently cross-linked to provide improved resistance to hydrophobic and hydrophillic solvents.

Inventors

  • 👤 Meftah U. Mahmud

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 21:25
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/42; B41M5/44; B41M5/426; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 96 words
A heat sensitive recording material, comprising: A. a substrate; B. a thermal imagewise imprintable color producing layer fixed to a first surface of said substrate comprising a leuco dye developable upon exposure to an acidic developer, a binder material for said dye and developer, an acidic developer material and a basic, particulate neutralizing agent; and C. a protective layer overlying said color producing layer, wherein said protective layer comprises an organic, water soluble resin ionically and covalently cross-linked throughout its thickness during its formation in situ atop said color producing layer and containing dispersed spacer particles.
Claim 2
Dependent Claim 96 words
A heat sensitive recording material, comprising: A. a substrate; B. a thermal imagewise imprintable color producing layer fixed to a first surface of said substrate comprising a leuco dye developable upon exposure to an acidic developer, a binder material for said dye and developer, an acidic developer material and a basic, particulate neutralizing agent; and C. a protective layer overlying said color producing layer, wherein said protective layer comprises an organic, water soluble resin ionically and covalently cross-linked throughout its thickness during its formation in situ atop said color producing layer and containing dispersed spacer particles.
Claim 3
Dependent Claim 13 words
The material of claim 1 wherein said resin is a carboxylated polyvinyl alcohol.
Claim 4
Dependent Claim 40 words
The material of claim 1 wherein said protective layer comprises an organic resin film cross-linked during its formation on said color producing layer by both a first, acid-catalyzed, covalently acting cross-linking agent, and a second, ionically acting inorganic cross-linking agent.
Claim 5
Dependent Claim 23 words
The material of claim 3 wherein said covalently acting cross-linking agent is melamine formaldehyde and the ionically acting cross-linking agent is aluminum sulfate.
Claim 6
Dependent Claim 28 words
The material of claim 4 wherein said protective layer is applied to said color producing layer at a coating weight of 3.0 to 8.0 grams per square meter.
Claim 7
Dependent Claim 22 words
The material of claim 1 further comprising an adhesive layer affixed to a second surface of said substrate opposite said first surface.

References Cited (Backward Citations)

US4370370A Cited
US4591887A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-05-21 1993-11-20 1994-05-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-05-21 1997-11-20 1998-05-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-05-21 2001-11-20 2002-05-22 $7700.00 Window Closed / Lapsed

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