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Polyvinylacetal resin for paint and ink and paint and ink composition

A polyvinyl acetal resin, polyvinyl alcohol technology, applied in polyacetal coatings, inks, applications, etc., can solve the problems of producing irritating odor, reducing pigment dispersibility, and increasing the viscosity of paint and ink compositions, To achieve the effect of high storage stability and enhanced dispersibility

Inactive Publication Date: 2005-04-27
SEKISUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the polyvinyl acetal resin is prepared by this method, there is a problem that since the aldehyde remains in the polyvinyl acetal resin, the generation of the reaction product between the aldehyde oxide and the aldehyde will cause the polyvinyl acetal Coloring of the resin, thus changing the color of the paint and ink composition to be formed, and causing a pungent odor, and the viscosity of the paint and ink composition increases during long-term storage
However, because antioxidants reduce the dispersibility of pigments in the formed paint and ink compositions, and when they are used as ink materials for food and pharmaceutical product packaging, there are safety issues, so it is necessary to limit the amount of antioxidants as much as possible. Dosage

Method used

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  • Polyvinylacetal resin for paint and ink and paint and ink composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In a 5-liter separable flask, after heating and dissolving 280 g of polyvinyl alcohol (polymerization degree 230, saponification degree 99.0 mol%) in 3200 g of distilled water, the solution was kept at 0° C., and 82 g of 35 wt % hydrochloric acid was added to To this solution, 150 g of n-butyraldehyde was then added to the solution. After adding n-butyraldehyde for 1 hour, the temperature of the solution was raised to 25° C. for 4 hours.

[0038] After the reaction was completed, the obtained resin was washed with distilled water, and the washed resin was redispersed in distilled water, and sodium hydroxide was added to adjust the pH of the resin dispersion to 7. The dispersion was heated to a temperature of 40°C, maintained at this condition for 5 hours, and then cooled to room temperature.

[0039] Secondly, wash the obtained resin with 500 times the amount of distilled water of the solid content, redisperse the washed resin in distilled water, then keep the resin di...

Embodiment 2

[0042] The polyvinyl acetal resin and ink were prepared following the same process as in Example 1, except that polyvinyl alcohol with a degree of polymerization of 250 and a degree of saponification of 97.0 mol% was used, and the aldehyde used was n-butyraldehyde.

Embodiment 3

[0044] The polyvinyl acetal resin and ink were prepared following the same process as in Example 1, except that polyvinyl alcohol with a degree of polymerization of 800 and a degree of saponification of 99.0 mol% was used, and the aldehyde used was n-butyraldehyde.

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Abstract

It is an object of the invention to provide a polyvinyl acetal resin for lacquer and ink, which can suppress the occurrence of coloring and a foul odor of the polyvinyl acetal resin itself even when no antioxidant is used at all therein, and a lacquer and ink composition which has excellent color and the high stability of viscosity in storing it for long periods. The invention provides a polyvinyl acetal resin for lacquer and ink synthesized by acetalization reaction of polyvinyl alcohol and an aldehyde, wherein a polymerization degree is 100 to 3,000, a proportion of a residual acetyl group is 25 mol % or less and a proportion of a residual hydroxyl group is 17 to 35 mol %; a content of the residual aldehyde is 100 ppm or less, a content of residual butyric acid is 100 ppm or less, a content of residual 2-ethyl-2-hexenal is 100 ppm, and a content of a residual acid catalyst is 300 ppm or less, and no antioxidant is remained at all therein.

Description

technical field [0001] The present invention relates to a polyvinyl acetal resin for use in paints and inks and a paint and ink composition capable of suppressing self-coloring and coloring of the polyvinyl acetal resin even when no antioxidant is used in the paints and inks at all The occurrence of pungent odor, the paint and ink composition has excellent color, and has high viscosity stability in long-term storage. Background technique [0002] Paints and inks are formed by adding colorants and additives corresponding to other uses in a solvent with a binder resin as a medium. Polyvinyl acetal resin is used as a binder resin in the field of paints and inks because of its good film-forming properties, pigment dispersibility, adhesion to the surface to be coated, and alcohol solubility. [0003] Polyvinyl acetal resins are usually prepared by reacting polyvinyl alcohol with aldehydes in the presence of an acid catalyst. However, when the polyvinyl acetal resin is prepared ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D129/14C08F8/28C08G4/00C09D11/00C09D159/00
CPCC09D159/00C09D11/106C08G4/00C09D11/102C09D129/14
Inventor 三宅祥隆岛津宏宣
Owner SEKISUI CHEM CO LTD
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