EP0376684A2
Expired / Lapsed
EP
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Process for preparing polymer emulsion particles having pores
Assignee: Mitsui Chemicals Inc
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Filing: 1989-12-27
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Granted: —
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Expires: 2009-12-27
Abstract
Abstract A process for preparing polymer emulsion particles having pores therein, an outside diameter D of 0.1 to 5.0 mu , an inside diameter d of 0.05 to 4.0 mu , and a ratio (d/D) of 0.1 to 0.9 in dry condition, comprising the steps of forming core-shell emulsion particles from specific monomers by two-emulsion polymerizations, and swelling the core of the particles with water by hydrolyzing the vinyl acetate part of polymer (A), thereby inducing the hydroxyl groups therein, e.g., using an acidic material or a basic material at 50 to 100 DEG C. The particles when use as a pigment in coating compositions provide excellent converage rate, brightness, gloss and water resistance.
Inventors
- 👤 Futoshi Hoshino
- 👤 Takeshi Yanagihara
- 👤 Makoto Nakano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 04:36
CPC Classifications
C; C08; C08F; C08F216/00; D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/56; D21H19/60; C08F2/00; C08F2/12; C08F2/16; C08F2/22; C08F263/00; C08F263/02; C08F263/04; C08F291/00; C08F8/00; C08F8/44; D21H19/58; C08F2810/00; C08F2810/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
150 words
A process for preparing polymer emulsion particles having pores therein, an outside diameter D of 0.1 to 5.0 µ, an inside diameter d of 0.05 to 4.0 µ, and a ratio (d/D) of 0.1 to 0.9 in a dry condition, comprising the steps of: (I) forming a polymer (A) by emulsion polymerization of 2 to 80 parts by weight of vinyl acetate and 98 to 20 parts by weight of another vinyl monomer (a) which is copolymerizable therewith; (II) forming core-shell emulsion particles whose shell comprised of a polymer (B) by the emulsion polymerization of 95 to 30 parts by weight of a vinyl monomer (b) while using 5 to 70 parts by weight by the polymer (A) as core particles; and (III) swelling the core of the particles with water by hydrolyzing the acetate groups of the vinyl acetate moieties of polymer (A), thereby forming the hydroxyl groups therein.
Claim 2
Dependent Claim
150 words
A process for preparing polymer emulsion particles having pores therein, an outside diameter D of 0.1 to 5.0 µ, an inside diameter d of 0.05 to 4.0 µ, and a ratio (d/D) of 0.1 to 0.9 in a dry condition, comprising the steps of: (I) forming a polymer (A) by emulsion polymerization of 2 to 80 parts by weight of vinyl acetate and 98 to 20 parts by weight of another vinyl monomer (a) which is copolymerizable therewith; (II) forming core-shell emulsion particles whose shell comprised of a polymer (B) by the emulsion polymerization of 95 to 30 parts by weight of a vinyl monomer (b) while using 5 to 70 parts by weight by the polymer (A) as core particles; and (III) swelling the core of the particles with water by hydrolyzing the acetate groups of the vinyl acetate moieties of polymer (A), thereby forming the hydroxyl groups therein.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein vinyl monomer (a) is selected from the group consisting of (meth)acrylic esters, aromatic vinyl monomers, vinyl cyano monomers and halogenated vinyl monomers.
Claim 4
Dependent Claim
28 words
The process of claim 1 wherein vinyl monomer (b) is selected from the group consisting of aromatic vinyl monomers, (meth)acrylic ester, vinyl cyano monomers and halogenated vinyl monomers.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein vinyl monomer (b) is an aromatic vinyl compound.
Claim 6
Dependent Claim
26 words
The process of claim 1 wherein the amount of vinyl acetate used is 5 to 50 parts by weight of monomers used to produce polymer (A).
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein the glass transition temperature of polymer (B) is at least 50°C.
Claim 8
Dependent Claim
23 words
The process of claim 1 wherein the pH of the thus-produced emulsion is not less than pH 8 or more than pH 3.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein the hydrolysis is conducted at temperature of 70 to 98°C.
Claim 10
Dependent Claim
26 words
The process of claim 1 wherein the particle have an outside diameter D of 0.3 to 1.0 µ and a ratio (d/D) of 0.2 to 0.8.
Claim 11
Dependent Claim
130 words
The process of claim 1 comprising the step of: (I) forming a polymer (A) by emulsion polymerization of 5 to 50 parts by weight of vinyl acetate and 95 to 50 parts by weight of the vinyl monomer (a) selected from the group consisting of (meth)acrylic esters, aromatic vinyl monomers, vinyl cyano monomers and halogenated vinyl monomers. (II) forming core-shell emulsion particles whose shell is comprised of polymer (B) by the emulsion polymerization of 95 to 30 parts by weight of a vinyl monomer (b) selected from the group consisting of aromatic vinyl monomers, (meth)acrylic ester, vinyl cyano monomers and halogenated vinyl monomers. (III) swelling the core of the particles with water by hydrolyzing the acetate groups of the vinyl acetate moieties of polymer (A), thereby forming hydroxyl groups therein.
Claim 12
Dependent Claim
122 words
A process for preparing polymer emulsion particles having pores therein, an outside diameter D of 0.1 to 5.0 µ, an inside diameter d of 0.05 to 4.0 µ, and a ratio (d/D) of 0.1 to 0.9 in a dry condition, which comprises the step of hydrolyzing the acetate moieties of a particulate vinyl acetate emulsion polymerized copolymer having a 2 to 80 parts by weight vinyl acetate content, which copolymer particles are the cores of core-shell particles and constitute 5 to 70 parts by weight of thereof, the shell of the particles being a polymer which is resistant to hydrolysis of a vinyl monomer emulsion polymerized onto the surface of the copolymre particles, thereby swelling the core particles and forming pores therein.
Claim 13
Dependent Claim
122 words
A process for preparing polymer emulsion particles having pores therein, an outside diameter D of 0.1 to 5.0 µ, an inside diameter d of 0.05 to 4.0 µ, and a ratio (d/D) of 0.1 to 0.9 in a dry condition, which comprises the step of hydrolyzing the acetate moieties of a particulate vinyl acetate emulsion polymerized copolymer having a 2 to 80 parts by weight vinyl acetate content, which copolymer particles are the cores of core-shell particles and constitute 5 to 70 parts by weight of thereof, the shell of the particles being a polymer which is resistant to hydrolysis of a vinyl monomer emulsion polymerized onto the surface of the copolymre particles, thereby swelling the core particles and forming pores therein.
References Cited (Backward Citations)
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