Polymer particles and use thereof

Patent metadata

Field	Value
Publication number	US-11098167-B2
Application number	US-201615764058-A
Country	US
Kind code	B2
Filing date	Mar 25, 2016
Priority date	Sep 30, 2015
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

Polymer particles excellent in uniform dispersibility and the use thereof are provided. The polymer particles contain a surfactant, and have a coefficient of variation in the volume-based particle diameter distribution in the range from not less than 13.0% to not more than 25.0%. When 15.0 g of water is added to 5.0 g of the polymer particles so as to disperse the polymer particles in the water by performing a dispersion treatment for 60 minutes using an ultrasonic cleaner, and furthermore when an obtained dispersion liquid is put into a centrifuge tube with an inside diameter of 24 mm so as to be centrifuged, by a centrifugal separator, under conditions that K factor is 6943 and a rotating time is 30 minutes to recover a supernatant, a concentration of non-volatile components in the obtained supernatant is less than 3.5 wt. %.

First claim

The invention claimed is:

1. Polymer particles comprising:
at least one polymer selected from the group consisting of a (meth)acrylic cross-linked polymer, a styrene cross-linked polymer, and a (meth)acrylic-styrene cross-linked co-polymer, and
a surfactant,
wherein a coefficient of variation in a volume-based particle diameter distribution is in a range from not less than 13.0% to not more than 25.0%,
wherein, when 15.0 g of water is added to 5.0 g of the polymer particles so as to disperse the polymer particles in the water by performing a dispersion treatment for 60 minutes using an ultrasonic cleaner, and furthermore when an obtained dispersion liquid is put into a centrifuge tube with an inside diameter of 24 mm so as to be centrifuged, by a centrifugal separator, under conditions that K factor is 6943 and a rotating time is 30 minutes to recover a supernatant, a concentration of non-volatile components in the obtained supernatant is less than 3.5 wt. %,
wherein a surfactant content per unit surface area of the polymer particles is 10×10 −5 g/m 2 to 250×10 −5 g/m 2 , and
wherein a volume average particle diameter is in a range from more than 8 μm to not more than 30 μm.

2. The polymer particles according to claim 1 ,
wherein the coefficient of variation in the volume-based particle diameter distribution is in a range from more than 15.0% to not more than 25.0%.

3. The polymer particles according to claim 1 ,
wherein a gel fraction is not less than 90 wt. %.

4. The polymer particles according to claim 1 , wherein a refractive index is in a range of 1.490 to 1.595.

5. The polymer particles according to claim 1 , wherein a maximum particle diameter in the volume-based particle diameter distribution is not more than 3.5 times the volume average particle diameter.

6. The polymer particles according to claim 1 ,
wherein a number of the polymer particles having a particle diameter in a range from not less than 8 μm to not more than 10 μm is not more than 2 in 300,000 polymer particles.

7. The polymer particles according to claim 1 ,
wherein a maximum particle diameter in the volume-based particle diameter distribution is not more than 2.5 times the volume average particle diameter.

8. The polymer particles according to claim 1 ,
wherein a value obtained by dividing a coefficient of variation in a number-based particle diameter distribution by the coefficient of variation in the volume-based particle diameter distribution is in a range of 1.0 to 3.0.

9. The polymer particles according to claim 1 ,
wherein the polymer particles are an additive to a coating agent or an additive to ink.

10. The polymer particles according to claim 1 ,
wherein the polymer particles are an additive to an external preparation.

11. The polymer particles according to claim 1 ,
wherein the polymer particles are a light diffusing agent for an optical member.

12. The polymer particles according to claim 1 ,
wherein the polymer particles are a surface roughening agent for a resin film.

13. Polymer particles comprising:
at least one polymer selected from the group consisting of a (meth)acrylic cross-linked polymer, a styrene cross-linked polymer, and a (meth)acrylic-styrene cross-linked co-polymer, and
a surfactant,
wherein a coefficient of variation in a volume-based particle diameter distribution is in a range from not less than 13.0% to not more than 25.0%,
wherein, when 15.0 g of water is added to 5.0 g of the polymer particles so as to disperse the polymer particles in the water by performing a dispersion treatment for 60 minutes using an ultrasonic cleaner, and furthermore when an obtained dispersion liquid is put into a centrifuge tube with an inside diameter of 24 mm so as to be centrifuged, by a centrifugal separator, under conditions that K factor is 6943 and a rotating time is 30 minutes to recover a supernatant, a concentration of non-volatile components in the obtained supernatant is less than 3.5 wt. %,
wherein a surfactant content per unit surface area of the polymer particles is 10×10 −5 g/m 2 to 250×10 −5 g/m 2 ,
wherein the polymer particles are an additive to a coating agent, to ink, or to an external preparation, and
wherein a volume average particle diameter is in a range of 4 to 30 μm.

14. A resin composition comprising the polymer particles according to claim 1 .

15. The resin composition according to claim 14 ,
wherein the resin composition is a resin composition for coating.

16. An optical film comprising: a base film; and a coating formed on the base film,
wherein the coating contains the polymer particles according to claim 1 .

17. An external preparation comprising the polymer particles according to claim 1 .

Assignees

• Sekisui Plastics

Inventors

• Goto Takashi
• Takahashi Tomoyuki
• Matsumoto Satoru

Classifications

• G02B5/0242

  by means of dispersed particles · CPC title

• C08F2/26

  anionic · CPC title

• C08J2475/04

  Polyurethanes · CPC title

• C08J2433/12

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title