PARTICULATE NUCLEATING AGENT AND METHOD FOR MANUFACTURING THE SAME

• US 20200131331A1
• Filed: 12/20/2016
• Published: 04/30/2020
• Est. Priority Date: 12/20/2016
• Status: Active Grant

• Current Assignee: GCH Technology Co., Ltd.
• Original Assignee: GCH Technology Co., Ltd.
• Inventors: ZHAO, Wenlin, GUAN, Fangwen
• Granted Patent: US 10,968,330 B2
• Time in Patent Office: Days
• CPC Class Codes: B01J 2/20 by expressing the material, e.g. through sieves and fragmenting the extruded length
• CPC Class Codes: B01J 2/28 using special binding agents
• CPC Class Codes: C07D 493/04 Ortho-condensed systems
• CPC Class Codes: C08K 2201/003 Additives being defined by their diameter
• CPC Class Codes: C08K 2201/004 Additives being defined by their length
• CPC Class Codes: C08K 2201/014 Additives containing two or more different additives of the same subgroup in C08K
• CPC Class Codes: C08K 2201/016 Additives defined by their aspect ratio
• CPC Class Codes: C08K 5/0083 Nucleating agents promoting the crystallisation of the polymer matrix
• CPC Class Codes: C08K 5/1575 Six-membered rings
• CPC Class Codes: C08L 2205/24 Crystallisation aids
• CPC Class Codes: C08L 23/12 Polypropene

Abstract

The present invention provides a particulate nucleating agent and a method for manufacturing the same. The particulate nucleating agent has an average radial crushing strength of 0.2-25.0N/cm. A weight content of the active ingredients in the particulate nucleating agent is no less than 90 wt %. The particulate nucleating agent is a transparent particulate nucleating agent. The particulate nucleating agent of the present invention can be fed smoothly during production without the change of the chemical composition thereof, so as to realize uniform dispersion in the polymer and reduce defects such as white dots in the polymer. The present invention breaks the traditional view of refining particles of nucleating agent to obtain a polymer having desirable properties, and avoids adding large amount of materials except the active ingredients during the granulation process of the nucleating agent.

Claims

1. A particulate nucleating agent comprising active ingredients in a weight content of no less than 90 weight % and having an average radial crushing strength of 0.2-25.0 N/cm.

2. The particulate nucleating agent of claim 1, wherein the particulate nucleating agent is a transparent nucleating agent having an average radial crushing strength of 1.0-15.0 N/cm and active ingredients in a weight content of no less than 95 wt %.

3. The particulate nucleating agent of claim 1, wherein a bulk density of the particulate nucleating agent is 0.25-0.6 g/cm³ and an average volume of particles in the particulate nucleating agent is 0.5-200 mm³.

4. The particulate nucleating agent of claim 3, comprising large size nucleating agent particles, middle size nucleating agent particles and powdery nucleating agent particles, wherein a volume of the middle size nucleating agent particles is 0.5-200 mm³, and a weight content of the middle size nucleating agent particles in the total particulate nucleating agent is no less than 70 weight %.

5. The particulate nucleating agent of claim 4, wherein a total weight content of the large size nucleating agent particles and the powdery nucleating agent particles in the particulate nucleating agent is less than 30 weight %, and a weight ratio of the large size nucleating agent particles to the powdery nucleating agent particles is 1:

0.1-10.

6. The particulate nucleating agent of claim 1, wherein the particles of the particulate nucleating agent each has a shape of a column, cone, frustum, sphere or ellipsoid.

7. The particulate nucleating agent of claim 6, wherein the particles of the particulate nucleating agent each has a shape of a cylinder having an average radius of 0.25-3.5 mm, and an average length of 1-12 mm.

8. The particulate nucleating agent of claim 7, wherein the average radius of the cylinder is 0.50-2.5 mm.

9. The particulate nucleating agent of claim 1, wherein the active ingredients of the particulate nucleating agent comprise a single chemical composition, and a weight content of the single chemical composition in the particulate nucleating agent is no less than 96 weight %, preferably no less than 98 weight %.

10. The particulate nucleating agent of claim 1,, wherein the active ingredients of the particulate nucleating agent comprise two chemical compositions, and a total weight content of the two chemical compositions is no less than 96 weight %, preferably no less than 98 weight %.

11. The particulate nucleating agent of claim 1, wherein the nucleating agent is sorbitol transparent nucleating agent.

12. The particulate nucleating agent of claim 11, wherein the sorbitol transparent nucleating agent is 1,3:

2,4-bis(p-chlorobenzylidene) -D-sorbitol, 1,3;

2,4-bis(p-methylbenzylidene)-D-sorbitol, 1,3;

2,4-bis(3,4-dimethylbenzylidene)-D-sorbitol or 1,3;

2,4-bis(4′

-propylbenzylidene) -1-propyl sorbitol, or the sorbitol transparent nucleating agent is a mixture of 1,3;

2,4-bis(p-chlorobenzylidene)-D-sorbitol and 1,3;

2,4-bis(3,4-dimethylbenzylidene)-D-sorbitol.

13. A polymer manufactured using the particulate nucleating agent of claim 1, wherein the particulate nucleating agent is added in polymer in a weight content of 1-4 weight % during the manufacturing of the polymer.

14. A method for manufacturing a polymer having uniform performances using the particulate nucleating agent of claim 1, wherein 1-4 weight of the particulate nucleating agent of claim 1 is added in the polymer during the manufacturing of the polymer.

15. A method for manufacturing the particulate nucleating agent of claim 1, comprising the steps of:

providing a powdery nucleating agent comprising the active ingredients;

adding 0.25 to 4.0 parts by weight of water into 1 part by weight of powdery nucleating agent and stirring, and obtaining a mixture;

extruding the mixture at an extrusion pressure of 0.5-7 Mpa and adjusting a ratio of the water content in the powdery nucleating agent to the extrusion pressure to 0.15-0.40; and

drying the extruded particles and obtaining the particulate nucleating agent.

16. The method of claim 15, wherein a binder is also added into the water, and a weight content of the binder in the mixture of the water and the powdery nucleating agent is 0.01-2.00%.

17. The method of claim 15, wherein the binder is water-soluble straight-chain polymer.