Hollow polymer particle and its preparing method, paper coating composition, coating paper and mfg. method

A technology of polymer particles and compositions, applied in the direction of coated paper base paper, coating, etc., can solve the problems of inability to obtain improvement, decrease in gloss, coating strength and whiteness, and greatly decrease in coating amount.

Inactive Publication Date: 2004-02-25
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the content exceeds a certain value, various properties such as hiding properties, gloss, coating strength and whiteness decrease
On the other hand, if the coating weight is greatly reduced, no improvement can be obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0051] (1) Preparation of polymer particles (A)

[0052] First, emulsion polymerization consists of an unsaturated carboxylic acid (a-1) [hereinafter referred to as "monomer (a-1)"] and a radically polymerizable monomer (a-2) copolymerizable with the monomer (a-1). ) [hereinafter referred to as "monomer (a-2)"] to prepare the title polymer particles (A). The type of dispersion medium used at this time is not particularly limited, and an aqueous medium is usually used.

[0053] The aqueous medium is usually water. Aqueous media containing water-soluble organic solvents (eg, ethanol, methanol, acetone, etc.) can also be used.

[0054] As examples of the monomer (a-1), mono- or dicarboxylic acids such as (meth)acrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid and the like, and anhydrides of dicarboxylic acids and the like are included. In view of particle stability, (meth)acrylic acid and itaconic acid are preferred. (Meth)acrylic acid is more preferred. ...

Embodiment 1

[0181] (1) Preparation of an aqueous dispersion comprising seed particles

[0182]109.5 parts of water as a medium, 0.2 parts of sodium dodecylbenzenesulfonate (trade name; "F65", manufactured by Kao Corporation) as an emulsifier, and 0.5 parts of persulfuric acid were added in advance to a reactor having a volume of 2 liters. Sodium acts as a polymerization initiator. Separately, 90 parts of methyl (meth)acrylate, 10 parts of methacrylic acid, 0.5 part of octyl thioglycolate as a molecular weight regulator, and an emulsifier (trade name; "F65", manufactured by Kao Corporation) were mixed and stirred. ) and 40 parts of water to prepare an aqueous dispersion (i) comprising a monomer mixture.

[0183] 20% of the aqueous dispersion (i) comprising the monomer mixture was added to the above reaction vessel. While stirring the liquid in the reaction vessel, the temperature was raised to 75° C. to polymerize for 1 hour. Then, while maintaining the temperature at 75° C., the remain...

preparation Embodiment 1

[0188] 186 parts of water were previously added as a medium to a reaction vessel having a volume of 2 liters, and 10 parts of the above-mentioned seed particles [25 parts of the aqueous dispersion (ii) containing seed particles] and 0.5 parts of persulfuric acid were added thereto in terms of solid content Sodium acts as a polymerization initiator.

[0189] Separately, 69.5 parts of methyl (meth)acrylate, 30 parts of methacrylic acid, 0.5 part of divinylbenzene (purity: 55%), 0.1 part of emulsifier (trade name; "F65", manufactured by Kao Corporation) were mixed and stirred. )) and 40 parts of water to prepare an aqueous dispersion (iii) comprising a monomer mixture.

[0190] Then, while stirring the liquid in the reaction vessel, the temperature was raised to and maintained at 80°C. The aqueous dispersion (iii) comprising the monomer mixture was fed continuously to the reaction vessel over 3 hours. Then, the resultant was aged for 2 hours to obtain an aqueous dispersion cont...

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Abstract

The present invention provides a kind of hollow polymer granules with good balancing property, for example gloss and coating strength and production method of said granules, paper coating composite by using said granules and coated paper. The hollow polymer granules can be obtained by using the following raw materials and processes: emulsion polymerization containing unsaturated carboxylic acid and free radical polymerizable monomer which can be copolymerized with unsaturated carboxylic acid, preparation of polymer granules, preparing core-shell polymer granules, regulating pH value of dispersion containing said core-shell polymer granules to above 7 and polymerizing unreacted monomer.

Description

technical field [0001] The present invention relates to a hollow polymer particle, a method for producing the same, a paper coating composition using the same, paper coated with the composition, and a method for producing the coated paper. [0002] More specifically, the present invention relates to a process that can efficiently produce various properties having a good balance, such as hiding properties, gloss, coating strength, water resistance, alkali resistance, weather resistance and heat resistance, and has Hollow polymer particles having a uniform particle diameter and high hollow ratio, especially hollow polymer particles useful as light scattering agents or light scattering aids in coatings, paints, etc. of paper, fibers, leather, etc. [0003] In addition, the present invention relates to a paper coating composition which can obtain well-balanced properties such as whiteness, opacity, gloss, coating strength, printing gloss, and low mottling properties, further, has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/00C09D133/00D21H19/72
Inventor 座间义明
Owner JSR CORPORATIOON
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