Hemispherical polymethylmethacrylate beads

Patent metadata

Field	Value
Publication number	US-9487651-B2
Application number	US-201214391008-A
Country	US
Kind code	B2
Filing date	Jul 10, 2012
Priority date	Aug 17, 2011
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

The present invention relates to a hemispherical polymethylmethacrylate bead, wherein the hemispherical polymethylmethacrylate bead of the invention has high adhesive property and oil absorption when applied to cosmetics, medical supply, household items, display devices, lighting fixtures, and miscellaneous goods and especially, it enables cheerful color when applied to cosmetics in comparison with spherical polymethylmethacrylate beads.

First claim

What is claimed is:

1. A polymethylmethacrylate bead wherein the shape of the polymethylmethacrylate bead is hemispherical and the polymethylmethacrylate bead has oil absorption of 2.4 to 3.0 cc/g.

2. The polymethylmethacrylate bead as claimed in claim 1 , wherein the hemispherical polymethylmethacrylate bead has a TAP density of 0.1 to 0.5 g/ml.

3. A method for preparing a hemispherical polymethylmethacrylate bead comprising adding an acrylic monomer, a crosslinking agent, an initiator, and a cosolvent to a solvent to polymerize them, and then washing and drying them, wherein the difference between the boiling point (BP) of the cosolvent and the reaction temperature of the initiator is −5 to 15° C.,
wherein the cosolvent is at least one selected from the group consisting of cyclohexane, ethyl acetate, methyl ethyl ketone, ortho chloro toluene, and isopropyl alcohol, and it is included in an amount of 100 to 400 parts by weight with regard to the total 100 parts by weight of the monomers to be used for the preparation of the bead.

4. The method for preparing the hemispherical polymethylmethacrylate bead as claimed in claim 3 , wherein the difference between the boiling point (BP) of the cosolvent and the reaction temperature of the initiator is 0 to 10° C.

5. The method for preparing the hemispherical polymethylmethacrylate bead as claimed in claim 3 , wherein at least one stabilizer selected from the group consisting of polyvinyl pyrrolidone, polyvinyl methyl ether, polyethyleneimine, poly acrylic acid, polyvinyl alcohol, vinyl acetate copolymer, ethyl cellulose and hydroxypropyl cellulose was used in an amount of 0.1 to 5 parts by weight with regard to the total 100 parts by weight of the monomers to be used for the preparation of the bead.

6. The method for preparing the hemispherical polymethylmethacrylate bead as claimed in claim 3 , wherein the initiator is at least one selected from the group consisting of 2,2-azobisisobutyronitrile, 4,4-azobis(4)-cyanopentanoic acid, 2,2-azobis(2-methylbutyronitrile), 2,2-azobis(2,4-dimethylvalenonitrile), benzoyl peroxide, lauryl peroxide, octanoyl peroxide, and 3,3,5-trimethyl hexanoyl peroxide, and it is included in an amount of 0.1 to 5 parts by weight with regard to the total 100 parts by weight of the monomers to be used for the preparation of the bead.

7. The method for preparing the hemispherical polymethylmethacrylate bead as claimed in claim 3 , further comprising a sorting process after the drying step.

8. A cosmetic, medical supply, household item, display device or lighting fixture comprising the hemispherical polymethylmethacrylate described in claim 1 .

Assignees

• Lee Sung Ho
• Park Jang Ho
• Kim Sang Uk
• Yoon Yang Bae
• Nam Hyun
• Sunjin Chemical Co Ltd

Inventors

• Lee Sung Ho
• Park Jang Ho
• Kim Sang Uk
• Yoon Yang Bae
• Nam Hyun

Classifications

• C08F220/14 Primary

  Methyl esters {, e.g. methyl (meth)acrylate} · CPC title

• C08L29/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• C09J133/12

  Homopolymers or copolymers of methyl methacrylate · CPC title

• Y10T428/2982

  Particulate matter [e.g., sphere, flake, etc.] · CPC title

• C08L33/12 Primary

  Homopolymers or copolymers of methyl methacrylate · CPC title