US5041464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polymer emulsion particles having pores
Assignee: Mitsui Chemicals Inc
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Filing: 1989-12-26
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Granted: 1991-08-20
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Expires: 2009-12-26
Abstract
Abstract A process for preparing polymer emulsion particles having pores therein, an outside diameter D of 0.1 to 5.0[ , an inside diameter d of 0.05 to 4.0μ , 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° 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
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:53
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: 18
Claim 1
Independent Claim
164 words
A process for preparing polymer emulsion particles having pores therein, an outside diameter D of 0.1 to 5.0μ, an inside diameter d of 0.05 to 4.0μ, 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 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 comprises 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 of 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
164 words
A process for preparing polymer emulsion particles having pores therein, an outside diameter D of 0.1 to 5.0μ, an inside diameter d of 0.05 to 4.0μ, 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 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 comprises 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 of 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
164 words
A process for preparing polymer emulsion particles having pores therein, an outside diameter D of 0.1 to 5.0μ, an inside diameter d of 0.05 to 4.0μ, 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 monomers (a) which is copolymerizable therewith; (II) forming core-shell emulsion particles whose shell comprises a polymer (B) by the emulsion polymerization of 95 to 30 parts by weight of a vinyl monomer (b) selected from the group consisting of (meth)acrylic esters, aromatic vinyl monomers, vinyl cyano monomers and halogenated vinyl monomers while using 5 to 70 parts by weight of 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 4
Dependent Claim
164 words
A process for preparing polymer emulsion particles having pores therein, an outside diameter D of 0.1 to 5.0μ, an inside diameter d of 0.05 to 4.0μ, 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 monomers (a) which is copolymerizable therewith; (II) forming core-shell emulsion particles whose shell comprises a polymer (B) by the emulsion polymerization of 95 to 30 parts by weight of a vinyl monomer (b) selected from the group consisting of (meth)acrylic esters, aromatic vinyl monomers, vinyl cyano monomers and halogenated vinyl monomers while using 5 to 70 parts by weight of 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 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
18 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
17 words
The process of claim 1 wherein the hydrolysis is conducted at temperature of 70° to 98° C.
Claim 10
Dependent Claim
25 words
The process of claim 1 wherein the particle have an outside diameter D of 0.3 to 1.0μ and a ratio (d/D) of 0.2 to 0.8.
Claim 11
Dependent Claim
166 words
A process for preparing polymer emulsion particles having pores therein, an outside diameter D of 0.1 to 5.0μ, an inside diameter d of 0.05 to 4.0μ, 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 5 to 50 parts by weight of vinyl acetate and 95 to 50 parts by weight of another 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 a 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 esters, vinyl cyano monomers and halogenated vinyl monomers; 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 12
Dependent Claim
166 words
A process for preparing polymer emulsion particles having pores therein, an outside diameter D of 0.1 to 5.0μ, an inside diameter d of 0.05 to 4.0μ, 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 5 to 50 parts by weight of vinyl acetate and 95 to 50 parts by weight of another 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 a 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 esters, vinyl cyano monomers and halogenated vinyl monomers; 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 13
Dependent Claim
14 words
The process of claim 2 wherein vinyl monomer (b) is an aromatic vinyl compound.
Claim 14
Dependent Claim
26 words
The process of claim 2 wherein the amount of vinyl acetate used is 5 to 50 parts by weight of monomers used to produce polymer (A).
Claim 15
Dependent Claim
18 words
The process of claim 2 wherein the glass transition temperature of polymer (b) is at least 50° C.
Claim 16
Dependent Claim
23 words
The process of claim 2 wherein the pH of the thus-produced emulsion is not less than pH 8 or more than pH 3.
Claim 17
Dependent Claim
17 words
The process of claim 2 wherein the hydrolysis is conducted at temperature of 70° to 98° C.
Claim 18
Dependent Claim
25 words
The process of claim 2 wherein the particles have an outside diameter D of 0.3 to 1.0μ and a ratio (d/D) of 0.2 to 0.8.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-08-19 | 1995-02-18 | 1995-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-19 | 1999-02-18 | 1999-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-19 | 2003-02-18 | 2003-08-20 | $7700.00 | Window Closed / Lapsed |