51results about How to "High color sensitivity" patented technology

An aqueous resin composition used to form an undercoat layer of a thermosensitive recording medium, comprising a water-repellent filler (A) having a water-repellent surface, which is composed of at least one of an organosilicon compound and an organofluorine compound, and an aqueous solution or water dispersion of a film-forming resin (B), which contains the water-repellent filler (A).

A chromene compound of this invention, as shown in the following formula:characterized by having an indeno(2,1-f)naphtho(1,2-b)pyran structure as a basic structure, and having a substituent which is a substituted or unsubstituted aryl group such as methoxyphenyl group, or a substituted or unsubsterituted heteroaryl group such as thienyl group bonding to a carbon atom at the seventh position of the indeno(2,1-f)naphtho(1,2-b)pyran structure. The photochromic compound exhibits a color tone of a neutral tint when it develops a color, features a high color-developing sensitivity and a high fading rate, and has a good photochromic resistance.

The chromene compound is represented by the following formula (I),wherein R3 at the 11-position is a sulfur-containing substituent selected from the group consisting of thiol group, alkylthio group, alkoxyalkylthio group, haloalkylthio group, cycloalkylthio group, arylthio group, heteroarylthio group, sulfonyl group and sulfinyl group, R1 and R2 at the 6-position and the 7-position are a combination of an aryl group or a heteroaryl group and an electron donating group having a Hammett constant σp of −0.1 or less, or R1 and / or R2 is sulfur-containing substituent selected from thiol group, alkylthio group, alkoxyalkylthio group, haloalkylthio group, cycloalkylthio group, arylthio group and heteroarylthio group.

The invention relates to a color developing method of hydrogen-containing phosphinate, which belongs to a selective color developing method of phosphinate in an organic reaction process. The method comprises the following steps: (1) color developing agent immersion: the color developing agent comprises 1g to 6g of phosphomolybdic acid, cerium ammonium molybdate or ammonium molybdate, dissolving the color developing agent into 5mL to 10mL of distilled water, adding 2mL to 10mL of concentrated hydrochloric acid, perchloric acid or concentrated sulfuric acid, making the volume to 100mL by utilizing acetone, water or ethanol, immersing an unfolded silicone sheet, and then taking out the silicone sheet; (2) drying, to be specific, drying the immersed sheet by utilizing a hot air mode of a dryer, and heating the sheet to the temperature of 100 to 150 DEG C, so that the color of the silicone sheet turns white from blue along with the increased temperature; and (3) iodine fumigation, to be specific, placing the dried sheet into an iodine cylinder, fumigating the sheet by iodine steam in the iodine cylinder to develop color, standing the sheet for 2 to 3 minutes, therefore, a clear dark blue color is displayed by the hydrogen-containing phosphinate, slight light blue is displayed by phosphate, and other ketones, acids, amines and carboxylic esters do not display color. The method has advantages that the sensitivity is high, convenience in operation is realized, rapidness in analysis is realized, and a good qualitative detection tool is provided for researching and developing the hydrogen-containing phosphinate compounds by combining the method with other color developing methods.

The invention discloses an environment-friendly carbon-free copy paper and a preparation method thereof. Copolymers such as melamine-formaldehyde resin and chitooligosaccharide water-soluble are used as wall materials, and carbon-free paper microcapsules are produced by an in-situ polymerization method to prepare a low-carbon carbon-free copy paper. Microcapsules with free formaldehyde content, and ensure that the chromogenic agent in the microcapsules is completely encapsulated, there is no free chromogenic agent, which overcomes the free formaldehyde content that must be brought in the preparation stage of the microcapsules, and at the same time in the preparation of no In the process of carbon paper, the content of free formaldehyde is also reduced, so that under the condition of effective cost, stable pressure-resistant and environmentally friendly carbon-free paper with low formaldehyde content can be produced.