KR910011907A - Method for producing an emulsion polymer having internal air - Google Patents

Abstract

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Description

Method for preparing an emulsion polymer having internal pores

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Claims (10)

The core is made of a hydrophilic monomer having a carboxylic acid group, a single double bond monomer and a crosslinkable monomer, and has a core portion of an alkali swellable polymer material inside the particle. The outer shell is made of a hard polymer material which does not form a continuous film at room temperature. A bead-type emulsion polymer for pigments having pores closed in the emulsion, wherein the emulsion polymer contains a metal or an amphoteric compound having a high refractive index in the pores of the core. 2. The emulsion polymer of claim 1 wherein the metal or amphoteric compound is an alkali soluble compound having a refractive index of at least 1. In claim 2, the metal or amphoteric compound is emulsified in that it is selected from Al ₂ O ₃ , ZnO, MgCr ₂ O ₇ , KH ₂ PO ₄ , (NH ₄ ) ₂ M ₀ O ₄ , ZnCa ₂ O ₄ polymer. By a multistage polymerization method, a monomer mixture of hydrophilic monomers, single double bond monomers and crosslinkable monomers having a carboxylic acid group is copolymerized to form a core portion of an alkali-swellable polymer material inside the particles and a hard hydrophobic layer that does not form a continuous coating at room temperature. In the method for producing an emulsion polymer composed of a shell made of a high molecular material, it is selected from a metal or an amphoteric compound methacrylic acid, or crotonic acid monomer dissolved in ammonia water in the reaction product of the emulsion polymer produced by copolymerization of the monomer mixture. How to feature. The method of claim 4 wherein the crosslinkable monomer forming the core portion is selected from monomers such as two or more double bonds such as ethylene glycol diacrylate, diethyl glycol diacrylate. The method of claim 4 wherein the hydrophobic monomer is selected from styrene, vinyltoluene, alkyl derivatives of acrylic acid, or alkyl derivatives of methacrylic acid. The method according to claim 4, wherein the emulsion polymerization of the core portion is made using an emulsion polymer prepared from a mixture of monomers containing 1-5% of acid monomers forming a core portion as a seed. The method according to claim 4, wherein the monomer mixture used in the skin forming process is formulated to have a glass transition temperature of 70 ° C or higher. The method according to claim 4, wherein the weight ratio of the monomer used in the core forming process and the monomer used in the shell forming process is used in a ratio of 1: 3 to 1:50. Method according to claim 4, characterized in that the reaction temperature of the shell forming process is 40-90 ° C. ※ Note: The disclosure is based on the initial application.