EMULSION PARTICLE, EMULSION COMPRISING SAME, METHOD FOR MANUFACTURING EMULSION

• US 20190330427A1
• Filed: 12/29/2017
• Published: 10/31/2019
• Est. Priority Date: 01/04/2017
• Status: Active Grant

• Current Assignee: Hanwha Chemical Corporation
• Original Assignee: Hanwha Chemical Corporation
• Inventors: CHOI, Jeong Hyun, KIM, Hee Yun, YEUM, Tae Hoon, LEE, Su Jin, CHO, Dae Won
• Granted Patent: US 11,046,821 B2
• Time in Patent Office: Days
• CPC Class Codes: C08F 2/22 Emulsion polymerisation
• CPC Class Codes: C08F 212/08 Styrene
• CPC Class Codes: C08F 220/06 Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
• CPC Class Codes: C08F 220/14 Methyl esters , e.g. methyl (meth)acrylate
• CPC Class Codes: C08F 220/1802 C2-(meth)acrylate, e.g. ethyl (meth)acrylate
• CPC Class Codes: C08F 220/1808 C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
• CPC Class Codes: C08F 220/325 containing glycidyl radical, e.g. glycidyl (meth)acrylate
• CPC Class Codes: C08F 222/102 of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate
• CPC Class Codes: C08F 265/06 Polymerisation of acrylate or methacrylate esters on to polymers thereof
• CPC Class Codes: C08F 285/00 Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
• CPC Class Codes: C08J 2325/06 Polystyrene
• CPC Class Codes: C08J 2333/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08J 2333/10 Homopolymers or copolymers of methacrylic acid esters
• CPC Class Codes: C08J 3/03 in aqueous media
• CPC Class Codes: C08J 3/126 Polymer particles coated by polymer, e.g. core shell structures
• CPC Class Codes: C08J 3/16 by coagulating dispersions C08J3/122 takes precedence
• CPC Class Codes: C08L 2207/53 Core-shell polymer
• CPC Class Codes: C08L 25/14 with unsaturated esters
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08L 33/10 Homopolymers or copolymers of methacrylic acid esters

Abstract

An emulsion particle, an emulsion including the same, and a method of manufacturing an emulsion are provided. The emulsion particle includes: a core derived from a polymer of an unsaturated ethylenic monomer and including a first sub core and a second sub core surrounding the first sub core; and a shell surrounding the core and including an alkali-soluble resin, wherein the first sub core includes a polymer having a first glass transition temperature, and the second sub core includes a polymer having a second glass transition temperature lower than the first glass transition temperature.

Claims

1. An emulsion particle, comprising:

a core derived from a polymer of an unsaturated ethylenic monomer and including a first sub core and a second sub core surrounding the first sub core; and

a shell surrounding the core and including an alkali-soluble resin,

wherein the first sub core includes a polymer having a first glass transition temperature, and

the second sub core includes a polymer having a second glass transition temperature lower than the first glass transition temperature.

2. The emulsion particle of claim 1,

wherein the shell includes a resin having a third glass transition temperature higher than the second glass transition temperature.

3. The emulsion particle of claim 2,

wherein the first glass transition temperature is 55°

C. to 100°

C., and

the second glass transition temperature is −

60°

C. to −

10°

C.

4. The emulsion particle of claim 2,

wherein a weight ratio of the polymer constituting the first sub core and the polymer constituting the second sub core is 50:

50 to 80;

20.

5. The emulsion particle of claim 4,

wherein the degree of cross-linking of the polymer constituting the first sub core is lower than the degree of cross-linking of the polymer constituting the second sub core.

6. The emulsion particle of claim 2,

wherein the core further includes a third sub core surrounding the second sub core, and

the third sub core includes a polymer having a fourth glass transition temperature higher than the second glass transition temperature.

7. The emulsion particle of claim 6,

wherein the fourth glass transition temperature is 55°

C. to 100°

C.

8. An emulsion, comprising:

a dispersion medium; and

styrene/acrylic emulsion particles dispersed in the dispersion medium,

wherein each of the emulsion particles includes;

a core derived from a polymer of an unsaturated ethylenic monomer and including a first sub core and a second sub core surrounding the first sub core, and

a shell surrounding the core and including an alkali-soluble resin.

9. The emulsion of claim 8,

wherein a content of the emulsion particles is 60 wt % or less with respect to a total weight of the emulsion,

the emulsion has a glass transition temperature of 25°

C. to 55°

C., and

the emulsion has an acid value of 100 mgKOH/g or less.

10. A method of manufacturing an emulsion, comprising:

preparing an alkaline aqueous medium in which an alkali-soluble resin is dissolved;

adding a first monomer mixture to the alkaline aqueous medium; and

adding a second monomer mixture, whose composition is different from a composition of the first monomer mixture, to the alkaline aqueous medium provided with the first monomer mixture.

11. The method of claim 10,

wherein a polymer formed by polymerizing the first monomer mixture has a first glass transition temperature, and

a polymer formed by polymerizing the second monomer mixture has a second glass transition temperature lower than the first glass transition temperature.

12. The method of claim 11,

wherein the alkali-soluble resin has a weight average molecular weight of 5,000 g/mol to 30,000 g/mol, a glass transition temperature of 30°

C. to 120°

C., and an acid value of 70 mgKOH/g to 180 mgKOH/g.

13. The method of claim 12,

wherein the second glass transition temperature is lower than the glass transition temperature of the alkali-soluble resin.

14. The method of claim 11,

wherein the first monomer mixture includes 80 wt % to 85 wt % of styrene and 13 wt % to 17 wt % of methyl methacrylate, with respect to a total weight of the first monomer mixture, and

the second monomer mixture includes 80 wt % to 85 wt % of ethylhexyl acrylate, 13 wt % to 17 wt % of methyl methacrylate, and 1.0 wt % to 5.0 wt % of glycidyl methacrylate, with respect to a total weight of the second monomer mixture.

15. The method of claim 11,

wherein the polymer formed by polymerizing the first monomer mixture constitutes a first sub core of an emulsion particle, and

the polymer formed by polymerizing the second monomer mixture constitutes a second sub core surrounding the first sub core of the emulsion particle.

16. The method of claim 10,

wherein polymerization of at least a part of the first monomer mixture is completed before adding the second monomer mixture.

17. The method of claim 16,

wherein each of the addition of the first monomer mixture and the addition of the second monomer mixture is continuously performed for 60 minutes to 180 minutes.

18. The method of claim 17,

wherein the first monomer mixture is added in an amount of 50 parts by weight to 450 parts by weight with respect to 100 parts by weight of the alkali-soluble resin, and

the second monomer mixture is added in an amount of 30 parts by weight to 350 parts by weight with respect to 100 parts by weight of the alkali-soluble resin.