Leuco dye chemistry sides free download

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Actions Shares. No notes for slide. Smart textiles 1. Smart fabrics or textiles are basically fabrics which are given smart functional characters by using various external stimuli or types of technologies. These products have the same features of a normal fabric, but with advanced options which are user friendly and attracts larger consumers. Innovation, technology, science, sustainability everything is incorporated to create such textiles.

There are a lot of uses of such items, such as hospitals, architecture, interior design, sports, music, etc. There are several techniques to give a fabric that smart finish by which it becomes a smart fabric.

Nano fabrics are textiles engineered with Nano materials in the size of atoms and molecules to give fabrics extra functionalities and advantageous properties such as super hydrophobicity.

Construction methods: nanotechnology can be introduced in many different ways into fabrics. When the leuco dye of present invention is used in a thermal recording label sheet, the sheet can be prepared by arranging a heat-sensitive color former layer containing the leuco dye of the present invention and a developer on one side of a support and arranging an adhesive layer and a release layer on the other side of the support. If desired, a protective layer such as a water-soluble resin layer can be provided on the surface of the heat-sensitive color former layer to increase stability of an obtained image.

The present invention is further described by the following examples without limiting the invention. In the following examples, "part s " means a value by weight unless otherwise stated. The sodium salt was dissolved over a period of about 30 minutes and the resulting aqueous solution was cooled.

The aqueous solution had a pH value in the range of 2 to 3. The pH value was adjusted to 4. After 30 minutes, a clear aqueous solution of a mixture of melamine, formaldehyde and a melamine-formaldehyde precondensate hereinafter referred to as precondensate solution was obtained. The aqueous solution of the mixture had a pH value in the range of 6 to 8. The obtained precondensate solution was added to the above-prepared emulsion. The pH value of the mixture was adjusted to 6.

The microcapsule dispersion was cooled to room temperature and the pH value was adjusted to 9. Further, 0. In parts of water were dispersed 80 parts of calcium carbonate, 20 parts of zinc oxide and 1 part of sodium hexametaphosphate in a mill to prepare a dispersion.

The dispersion was mixed with the above-prepared emulsion. The developer sheet was combined with the color former sheet to prepare a pressure-sensitive recording sheet I.

Pressure-sensitive recording sheets II and III were prepared in the same manner as in Example 1 except that the following leuco dyes 2 and 3 were respectively used in place of the leuco dye 1 in the preparation of the color former sheet. Pressure-sensitive recording sheets IV and V were prepared in the same manner as in Example 1 except that Crystal Violet Lactone CVL and 3-diethylaminomethylanilinofluoran herinafter referred to as AF were respectively used in place of the leuco dye 1 in the preparation of the color former sheet.

Each of the pressure-sensitive recording sheets I to V was pressed to obtain a color image corresponding to each of the color former. Each of the obtained images had a high optical density. The results are set forth in Table 1. It is apparent from the results in Table 1 that color images obtained on the pressure-sensitive recording sheets I , II and III containing the leuco dye of the present invention intensively absorb light in the near infrared region wavelength: not shorter than nm , while color images obtained from the sheets IV and V scarcely absorb light in the near infrared region.

In the FIG. It is apparent from the results in FIG. The percent absorpsion at both peaks Each of the mixtures having the following composition was dispersed in a ball mill to prepare each of Liquids A to D.

The liquids A, B and C were mixed in a ratio of by weight to prepare a coating solution. A heat-sensitive recording sheet VII was prepared in the same manner as in Example 4 except that the leuco dye 3 used in Example 3 was used in place of the leuco dye 1 in the preparation of Liquid A.

A heat-sensitive recording sheet VIII was prepared in the same manner as in Example 4 except that the following leuco dye x which is described in Japanese Patent Provisional Publication No. Each of the recording materials on which a color image had been formed was evaluated by measuring light resistance of the color image and the region of the absorption wavelength in absorption spectrum of the color image.

The light resistance was evaluated by irradiating each material with light having an illuminance of 80, lx by an xenon lamp, measuring the optical density of the color image and comparing the optical density after irradiation with that before irradiation. It is apparent from the results in Table 2 that color images obtained on the pressure-sensitive recording materials VI and VII containing the leuco dye of the present invention are superior in light resistance to the color image obtained from the recording material VIII containing a conventional leuco dye.

We claim: 1. A leuco dye having the following formula I : STR9 wherein each of R 1 , R 2 and R 3 independently is a monovalent group selected from the group consisting of hydrogen, an alkyl group, an aralkyl group, a cycloalkyl group and an aryl group; each of X 1 and X 2 independently is a divalent group selected from the group consisting of oxygen, sulfur and --NR 4 --, wherein R 4 is a monovalent group selected from the group consisting of hydrogen, an alkyl group, an aralkyl group, a cycloalkyl group and an aryl group; each of the rings A to E independently is benzene ring or naphthalene ring, each of which may have one or more substituent groups and each of R 1 to R 4 may have one or more substituent groups.

The leuco dye claimed in claim 1, wherein each of R 1 , R 2 and R 3 independently is a monovalent group containing carbon atoms. The leuco dye claimed in claim 1, wherein X 1 and X 2 are the same divalent group. The leuco dye claimed in claim 1, wherein each of the rings B, C and E is benzene ring. USA en. JPHB2 en. DEC2 en. GBB en.

Leuco dye dispersion liquid and thermosensitive recording material using the same. A kind of double donor hole mobile materials of the structure containing phenoxazine and preparation method thereof and perovskite solar battery. JPB2 en. New phthalide derivatives, process for preparing the same and recording system utilizing the same as colourless chromogenic material.

USB2 en. Double-donor hole transport material containing phenoxazine structure, preparation method thereof and perovskite solar cell. GBA en. GBD0 en. JPSA en. DEA1 en. Chromogenic azaphthalide compound and a colour-forming recording composition containing the same. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime. Chemistry and Application of Leuco Dyes. Upcoming SlideShare. Like this presentation?

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