Polymer composition for an electric circuit protection device

Patent metadata

Field	Value
Publication number	US-12104010-B2
Application number	US-202217575941-A
Country	US
Kind code	B2
Filing date	Jan 14, 2022
Priority date	Feb 4, 2021
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

A polymer composition for use in an electric circuit protection device is provided. The polymer composition comprises a polymer matrix that includes a thermotropic liquid crystalline polymer. The polymer composition exhibits an in-plane thermal conductivity of about 3.5 W/m-K or more as determined in accordance with ASTM E1461-13 and a melt viscosity of from about 1 to about 100 Pa-s as determined in accordance with ISO Test No. 11443:2014 at a temperature 15° C. higher than the melting temperature.

First claim

What is claimed is:

1. A polymer composition comprising:
100 parts by weight of a polymer matrix that includes a thermotropic liquid crystalline polymer;
from 60 to 300 parts by weight of mineral particles; and
from 0.1 to 20 parts by weight of a metal hydroxide, wherein the metal hydroxide has the general formula M(OH) a O b , where M is a metal, 0≤a≤3, and b=(3−a)/2;
wherein the polymer composition exhibits an in-plane thermal conductivity of 4.0 W/m-K or more as determined in accordance with ASTM E1461-13 and a melt viscosity of from 1 to 100 Pa-s as determined in accordance with ISO Test No. 11443:2014 at a temperature 15° C. higher than the melting temperature.

2. The polymer composition of claim 1 , wherein the polymer composition exhibits a through-plane thermal conductivity of 0.6 W/m-K or more as determined in accordance with ASTM E 1461-13.

3. The polymer composition of claim 1 , wherein the polymer composition exhibits an in-plane thermal conductivity of more than 4 to 10 W/m-K and a through-plane thermal conductivity of from 0.8 to 2 W/m-K, as determined in accordance with ASTM E 1461-13.

4. The polymer composition of claim 1 , wherein the polymer composition exhibits a melt viscosity of from 5 to 60 Pa-s as determined in accordance with ISO Test No. 11443:2014 at a temperature 15° C. higher than the melting temperature.

5. The polymer composition of claim 1 , wherein the polymer matrix constitutes from 20 wt. % to 65 wt. % of the polymer composition.

6. The polymer composition of claim 1 , wherein the liquid crystalline polymer has a melting temperature of 280° C. to 400° C.

7. The polymer composition of claim 1 , wherein the liquid crystalline polymer contains repeating units derived from one or more aromatic dicarboxylic acids, one or more aromatic hydroxycarboxylic acids, or a combination thereof.

8. The polymer composition of claim 7 , wherein the aromatic hydroxycarboxylic acids include 4-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, or a combination thereof.

9. The polymer composition of claim 7 , wherein the aromatic dicarboxylic acids include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, or a combination thereof.

10. The polymer composition of claim 7 , wherein the liquid crystalline polymer further contains repeating units derived from one or more aromatic diols.

11. The polymer composition of claim 10 , wherein the aromatic diols include hydroquinone, 4,4′-biphenol, or a combination thereof.

12. The polymer composition of claim 1 , wherein the liquid crystalline polymer is wholly aromatic.

13. The polymer composition of claim 1 , wherein the liquid crystalline polymer contains repeating units derived from naphthenic hydroxycarboxylic and/or dicarboxylic acids in an amount of 10 mol. % or more.

14. The polymer composition of claim 13 , wherein the liquid crystalline polymer contains repeating units derived from 6-hydroxy-2-naphthoic acid in an amount of 30 mol. % or more.

15. The polymer composition of claim 13 , wherein the liquid crystalline polymer contains repeating units derived from 2,6-naphthalenedicarboxylic acid in an amount of 10 mol. % or more.

16. The polymer composition of claim 1 , wherein the mineral particles constitute from 40 wt. % to 60 wt. % of the polymer composition and the metal hydroxide constitutes from 0.01 wt. % to5 wt. % of the polymer composition.

17. The polymer composition of claim 1 , wherein the mineral particles include talc.

18. The polymer composition of claim 1 , wherein the mineral particles have a median diameter of from 1 to 25 micrometers, specific surface area of from 1 to 50 m 2 /g as determined in accordance with DIN 66131:1993, and/or moisture content of 5% or less as determined in accordance with ISO 787-2:1981 at a temperature of 105° C.

19. The polymer composition of claim 1 , wherein the metal hydroxide includes aluminum hydroxide.

20. The polymer composition of claim 1 , wherein the polymer composition is free of fillers having an intrinsic thermal conductivity of 100 W/m-K or more.

21. An electric circuit protection device comprising the polymer composition of claim 1 .

22. The electric circuit protection device of claim 21 , wherein the device comprises a resistive element that is disposed in contact with an insulative body, wherein the resistive element is electrically connected to one or more electrical terminations, and further wherein a protective member covers at least a portion of the insulative body and the resistive element.

23. The electric circuit protection device of claim 22 , wherein the insulative body and/or the protective member comprise the polymer composition.

24. An electric circuit protection device comprising a resistive element that is disposed in contact with an insulative body, wherein the resistive element is electrically connected to one or more electrical terminations, and wherein a protective member covers at least a portion of the insulative body and the resistive element, wherein the insulative body and/or the protective member comprise the polymer composition of claim 1 .

25. The electric circuit protection device of claim 24 , wherein the polymer composition comprises from 80 to 250 parts by weight of mineral particles per 100 parts by weight of the polymer matrix and from 0.3 to 10 parts by weight of the metal hydroxide per 100 parts by weight of the polymer matrix.

26. The electric circuit protection device of claim 25 , wherein the mineral particles include talc.

27. The electric circuit protection device of claim 25 , wherein the metal hydroxide includes aluminum hydroxide.

28. The electric circuit protection device of claim 24 , wherein the liquid crystalline polymer contains repeating units derived from one or more aromatic dicarboxylic acids, one or more aromatic hydroxycarboxylic acids, or a combination thereof.

29. The electric circuit protection device of claim 28 , wherein the aromatic hydroxycarboxylic acids include 4-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, or a combination thereof.

30. The electric circuit protection device of claim 28 , wherein the aromatic dicarboxylic acids include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, or a combination thereof.

31. The electric circuit protection device of claim 28 , wherein the liquid crystalline polymer further contains repeating units derived from one or more aromatic diols.

32. The electric circuit protection device of claim 31 , wherein the aromatic diols include hydroquinone, 4,4′-biphenol, or a combination thereof.

33. The electric circuit protection device of claim 24 , wherein the liquid crystalline polymer is wholly aromatic.

34. The electric circuit protection device of claim 24 , wherein the liquid crystalline polymer contains repeating units derived from naphthenic hydroxycarboxylic and/or dicarboxylic acids in an amount of 10 mol. % or more.

35. The electric circuit protection device of claim 34 , wherein the liquid crystalline polymer contains repeating units derived from 6-hydroxy-2-naphthoic acid in an amount of 30 mol. % or more.

36. The electric circuit protection device of claim 34 , wherein the liquid crystalline polymer contains repeating units derived from 2,6-

Assignees

• Ticona Llc

Inventors

• Kim Young Shin

Classifications

• C08K3/22 Primary

  of metals · CPC title

• C08G2250/00

  Compositions for preparing crystalline polymers · CPC title

• H01B3/423 Primary

  Linear aromatic polyesters · CPC title

• C08K3/34

  Silicon-containing compounds · CPC title

• C08K2003/2227

  of aluminium · CPC title