Liquid crystalline polymer composition and molded article made of the same

• US 7,892,450 B2
• Filed: 04/23/2008
• Issued: 02/22/2011
• Est. Priority Date: 04/23/2007
• Status: Expired due to Fees

• Current Assignee: Ueno Fine Chemicals Industry Ltd.
• Original Assignee: Ueno Fine Chemicals Industry Ltd.
• Inventors: Uchida, Hiroto, Kato, Hiroyuki, Saito, Tomoyuki, Tsuchiya, Hitoshi
• Primary Examiner(s): Visconti; Geraldina
• Application Number:
  US12/107,951
• Publication Number:
  US 20080258106A1
• Time in Patent Office: 1,035 Days
• Field of Search: 252/299.01, 252/299.6, 430/20, 428/1.1, 349/117, 349/186
• US Class Current: 252/299.01
• CPC Class Codes: C09K 19/38 Polymers
• CPC Class Codes: C09K 19/3838 Polyesters; Polyester derivatives
• CPC Class Codes: C09K 19/52 characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition

Abstract

Provided is a liquid crystalline polymer composition comprising: 100 parts by weight of a LCP, and equal to or more than 0.01 and less than 1 part by weight of a low temperature softening inorganic glass filler whose softening temperature is equal to or less than 550° C. The composition can provide a molded article which cause no or less blister formation upon reflow soldering using a lead-free solder.

Claims

1. A liquid crystalline polymer composition comprising:

100 parts by weight of a liquid crystalline polymer, and equal to or more than 0.01 and less than 1 part by weight of a low temperature softening inorganic glass filler whose softening temperature is equal to or less than 550°

C.

2. The composition according to claim 1, wherein the low temperature softening inorganic glass filler comprises P₂O₅ and ZnO as structural components of the glass.

3. The composition according to claim 1, wherein the low temperature softening inorganic glass filler is a powder filler having a median diameter of 0.1-500μ

m.

4. The composition according to claim 1, wherein the composition further comprises 1-200 parts by weight of an additional filler selected from fibrous, lamellar, and powder fillers.

5. The composition according to claim 1, wherein the composition is obtained by melt kneading the liquid crystalline polymer and the low temperature softening inorganic glass filler.

6. The composition according to claim 1, wherein the composition is obtained by mixing the liquid crystalline polymer in the form of pellets and a low temperature softening inorganic glass filler so that the low temperature softening inorganic glass filler is attached to the surface of the pellets.

7. The composition according to claim 6, wherein the liquid crystalline polymer in the form of pellets comprises a low temperature softening inorganic glass filler and/or the additional filler dispersed therein.

8. The composition according to claim 4, wherein the fibrous filler is selected from the group consisting of glass fiber, ellipse-shape glass fiber, cocoon-shape glass fiber, silica-alumina fiber, alumina fiber, carbon fiber, aramid fiber, potassium titanate fiber, aluminum borate fiber, wollastonite and a mixture thereof;

the lamellar and/or powder filler is selected from the group consisting of talc, mica, graphite, calcium carbonate, dolomite, clay, glass flake, glass beads, barium sulfate, titanium oxide, diatomite and a mixture thereof.

9. The composition according to claim 4, wherein the additional filler is a fibrous filler selected from the group consisting of glass fiber, ellipse-shape glass fiber, cocoon-shape glass fiber, silica-alumina fiber, alumina fiber, carbon fiber, aramid fiber, potassium titanate fiber, aluminum borate fiber, wollastonite and a mixture thereof.

10. The composition according to claim 4, wherein the additional filler is a fibrous filler selected from the group consisting of glass fiber, ellipse-shape glass fiber, cocoon-shape glass fiber and a mixture thereof.

11. The composition according to claim 4, wherein the additional filler is a combination of a fibrous filler selected from the group consisting of glass fiber, ellipse-shape glass fiber, cocoon-shape glass fiber, silica-alumina fiber, alumina fiber, carbon fiber, aramid fiber, potassium titanate fiber, aluminum borate fiber, wollastonite and a mixture thereof, and talc.

12. The composition according to claim 4, wherein the additional filler is a combination of a fibrous filler selected from the group consisting of glass fiber, ellipse-shape glass fiber, cocoon-shape glass fiber and a mixture thereof, and talc.

13. A molded article, which is obtained by molding the liquid crystalline polymer composition according to claim 1.

14. A surface mount type electronic component, which is obtained by molding the liquid crystalline polymer composition according to claim 1.

15. The electronic component according to claim 14, which is mounted with a lead free solder.

16. The electronic component according to claim 14, which is selected from switch, relay, connecter, condenser, coil, trans, camera module, antenna and chip antenna switch.

17. The composition according to claim 1, wherein the liquid crystalline polymer has a crystalline melting temperature determined by differential scanning calorimeter of 280-360°

C.