Camera module
A camera module containing a molded part (e.g., generally planar base, lens barrel mounted on the base, etc.) that is formed form a polymer composition is provided. The polymer composition includes a liquid crystalline polymer and inorganic particles that have a hardness value of about 2.5 or more based on the Mohs hardness scale.
1. A camera module that comprises a molded part having a thickness of about 500 micrometers or less, wherein the molded part is formed from a polymer composition that comprises a thermotropic liquid crystalline polymer, a conductive filler, and from 10 wt. % to about 50 wt. % of inorganic particles having a hardness value of from 2.5 to 4.5 based on the Mohs hardness scale, wherein the inorganic particles have a median width of from about 2 to about 20 micrometers, wherein the inorganic particles contain barium sulfate; wherein the conductive filler includes an ionic liquid.
2. The camera module of claim 1 , wherein the camera module comprises a generally planar base on which is mounted a lens barrel, wherein the base, barrel, or both contain the molded part.
3. The camera module of claim 1 , wherein the inorganic particles have a hardness value of from about 3.0 to about 3.5 based on the Mohs hardness scale.
4. The camera module of claim 1 , wherein liquid crystalline polymers constitute from about 25 wt. % to about 95 wt. % of the composition.
5. The camera module of claim 1 , wherein the liquid crystalline polymer contains aromatic ester repeating units.
6. The camera module of claim 5 , wherein the aromatic ester repeating units are aromatic dicarboxylic acid repeating units, aromatic hydroxycarboxylic acid repeating units, or a combination thereof.
7. The camera module of claim 5 , wherein the polymer further contains aromatic diol repeating units.
8. The camera module of claim 1 , wherein the liquid crystalline polymer contains repeating units derived from 4-hydroxybenzoic acid, terephthalic acid, hydroquinone, 4,4′-biphenol, acetaminophen, 6-hydroxy-2-naphthoic acid, 2,6-naphthelene dicarboxylic acid, or a combination thereof.
9. The camera module of claim 1 , wherein the polymer composition further comprises mineral fibers.
10. The camera module of claim 9 , wherein the mineral fibers include fibers derived from a silicate.
11. The camera module of claim 10 , wherein the silicate is an inosilicate.
12. The camera module of claim 11 , wherein the inosilicate includes wollastonite.
13. The camera module of claim 1 , further comprising a glass filler, silicate filler, functional compound, or a combination thereof.
14. The camera module of claim 1 , wherein the molded part has a Rockwell hardness of about 40 more, as determined in accordance with ASTM D785-08 (Scale M).
15. The camera module of claim 1 , wherein the inorganic particles constitute from about 20 wt. % to about 50 wt. % of the polymer composition.
16. The camera module of claim 1 , wherein the inorganic particles have a mean width of from about 3 to about 15 micrometers.
17. The camera module of claim 1 , wherein the inorganic particles containing barium sulfate have a narrow size distribution such that at least about 60% by volume of the particles containing barium sulfate have a median width of from 2 to 20 micrometers.
18. The camera module of claim 1 , wherein liquid crystalline polymers constitute from about 25 wt. % to about 95 wt. % of the composition.
19. The camera module of claim 1 , wherein liquid crystalline polymers constitute from about 40 wt. % to about 70 wt. % of the composition.
20. The camera module of claim 1 , wherein the molded part exhibits a surface resistivity of about 1×10 15 ohms or less.
21. The camera module of claim 1 , wherein the molded part exhibits a volume resistivity of about 1×10 15 ohm-m or less.
22. The camera module of claim 1 , wherein the molded part exhibits a Rockwell hardness of about 40 or more as determined in accordance with ASTM D785-08 (Scale M), surface resistivity of about 1×10 15 ohms or less, and volume resistivity of about 1×10 15 ohm-m or less.