Heat-sensitive recording material
A heat-sensitive recording material and heat-sensitive recording technology, applied in temperature recording methods, etc., can solve problems such as failure to achieve water resistance, adhesion, and deposition at the end
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[0153] Hereinafter, the thermosensitive recording material of the present invention will be described by way of examples. In addition, in the description, parts and % represent parts by weight and % by weight, respectively, unless otherwise specified.
[0154] The following evaluations were performed on the thermosensitive recording media obtained in Examples and Comparative Examples.
[0155] [Color Sensitivity]
[0156] Using TH-PMD manufactured by Okura Electric Co., Ltd., printing was performed on the produced thermosensitive recording material with applied energy of 0.25 mJ / dot and 0.34 mJ / dot. The image density after printing and after the quality test was measured with a Macbeth densitometer (using an amber filter).
[0157] [water resistance]
[0158] One drop of water was dropped on the surface of the thermosensitive recording material, and after 10 seconds, it was wiped once with facial tissue, and the peeling degree of the recording surface was judged visually, and...
Synthetic example 1
[0174] Pure water was added to commercially available JIS No. 3 water glass (SiO 2 / Na 2 O molar ratio is 3.22, SiO 2 Concentration is 28.5% by weight), obtains SiO 2 An aqueous solution of sodium silicate with a concentration of 3.6% by weight. The above-mentioned sodium silicate aqueous solution was passed through a cation exchange resin packed column with the trade name Amba-Light 120B prepared separately, thereby obtaining SiO 2 A colloidal aqueous solution of active silicic acid with a concentration of 3.60% by weight, a pH of 2.90, and a conductivity of 580 μS / cm.
[0175] The colloidal aqueous solution 888g (SiO 2 content 32.0g) into a glass container, add 600g of pure water under stirring to make SiO 2 A colloidal aqueous solution of active silicic acid at a concentration of 2.15% by weight and a pH of 3.07. Next, 59 g (CaO content 2.02 g) of 10 weight% calcium nitrate aqueous solution (pH 4.32) was added thereto at room temperature with stirring, and stirring wa...
Synthetic example 2
[0183] 1,800 g of the alkaline mixed liquid (c) obtained in Example 1 was put into a stainless steel autoclave, stirred and heated at 135° C. for 3 hours, cooled, and 1,800 g of the contents were taken out. The obtained liquid is transparent colloidal silica sol [chain silica sol B], SiO 2 The content concentration is 21.5% by weight, the pH is 9.56, the specific gravity is 1.141, the viscosity is 4.5 mPa·s, the electrical conductivity is 3285 μS / cm, and the particle diameter (D1) measured by the dynamic light scattering method is 116 nm. Therefore, the D1 / D2 ratio is 5.66.
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