Record receiver having plural interactive leaves or a colorless – Having a colorless color-former – developer therefor – or... – Having constituent defined in terms of melting temperature
Patent
1990-01-19
1991-12-10
Hess, Bruce H.
Record receiver having plural interactive leaves or a colorless
Having a colorless color-former, developer therefor, or...
Having constituent defined in terms of melting temperature
427150, 503209, 503216, 503225, B41M 530
Patent
active
050718215
DESCRIPTION:
BRIEF SUMMARY
This invention relates to thermal mark forming record material, in particular to thermal paper of the general type described, and especially to such record material having improved low temperature reactivity and/or a narrow temperature-energy image formation bandwidth.
Thermal paper in which the image forming components comprise an electron donating chromogenic colour former and an electron accepting (acidic) co-reactant are widely used in facsimile machines and computer printers especially small and/or portable printers. It has long been desirable to reduce the energy requirement for image formation as this can be exploited in increased printing speed and/or lower input power requirements, whilst avoiding undue increase in premature colouration or increased background colouration.
The present invention is based on our finding that a particular combination of co-reactant and (relatively) low melting point compounds gives particularly good results, especially by reducing the energy input requirement, at a given local temperature, required to generate a densely coloured image.
The invention accordingly provides thermally responsive record material comprising a sheet substrate, particularly of paper, having on one surface a mark forming thermally reactive coating comprising a thermographically acceptable binder having dispersed therein finely divided solid particles of: 2,2-bis(4-hydroxyphenyl)-4-methylpentane as electron accepting thermal co-reactant; to 140.degree. C.; and 120.degree. C. and selected from diaryl ethers, acetoacetic anilides, phenyl hydroxynaphthoates, aryl or aralkyl substituted biphenyls, and diaryl carbonates; 10:1.
The record material includes a substrate or support material which is generally in sheet form. As used herein the term `sheet` or `sheets` mean(s) article(s) having two relatively large surface dimensions and a relatively small third (thickness) dimension and includes webs, ribbons, tapes, belts, films and cards. The substrate or support material can be opaque, transparent or translucent and can, itself, be coloured or uncoloured. The material can be fibrous including, for example, paper and filamentous synthetic materials. It can be a film including, for example, cellophane and synthetic polymeric sheets cast, extruded, or otherwise formed. Whilst the particular nature of the substrate material is not especially critical, it is particularly and most commonly of paper.
The long chain fatty acid amide is one having a melting point of from 80.degree. to 140.degree. C., more particularly 90.degree. to 135.degree. C. and is the amide of a C.sub.14 to C.sub.22 aliphatic, preferably saturated, fatty acid in particular palmitic, stearic or behenic, but especially stearic, acid. The acid can be substantially pure or, but not particularly preferably, a mixture of such acids as is derived from biological glyceride esters. The amide can be the primary amide as in stearic acid amide, C.sub.17 H.sub.35 CONH.sub.2, m.pt. 99.degree. C., or an N-alkyl secondary amide in which the alkyl residue is preferably a short chain, especially C.sub.2 to C.sub.4, group and may form an alkylene bridge between two amide residues as in ethylene-bis-stearamide, C.sub.17 H.sub.35.CONH.CH.sub.2 CH.sub.2.NHOC.C.sub.17 H.sub.35, m.pt. 130.degree. C.
The sensitizer is an organic aromatic compound having a melting point in the range 60.degree. C. to 120.degree. C., particularly 75.degree. to 110.degree. C., and is selected from diaryl ethers, acetoacetic anilides, phenyl hydroxynaphthoates, aryl or aralkyl substituted biphenyls and diaryl carbonates. Among diaryl ethers, those based on alkanes or alkane ethers such as oxy or polyoxy alkylene ethers, are particularly suitable, especially bis-phenyloxyalkanes, optionally including one or more substituents such as alkyl or alkoxy group(s) or halogen atom(s), e.g. 1,2-diphenoxyethane, m.pt. 94.degree.-96.degree. C., and 1,2-bis(2-methylphenoxy)ethane, m.pt. 85.degree.-86.degree. C. Acetoacetic anilides which can be used in the invention include N-acetoacetylaniline (
REFERENCES:
patent: 4470057 (1984-09-01), Glanz
patent: 4535347 (1985-08-01), Glanz
patent: 4586061 (1986-04-01), Glanz
patent: 4786629 (1988-11-01), Kawakami et al.
patent: 4794102 (1988-12-01), Petersen et al.
Clark Debra J.
Damarell Keith B.
Smith Vivienne J.
Hess Bruce H.
The Wiggins Teape Group Limited
LandOfFree
Thermal record material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thermal record material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal record material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1040609