LASER-TRANSPARENT POLYESTERS

• US 20110288220A1
• Filed: 05/13/2011
• Published: 11/24/2011
• Est. Priority Date: 05/18/2010
• Status: Active Grant

• Current Assignee: BASF SE
• Original Assignee: BASF SE
• Inventors: Benten, Rebekka von, Eibeck, Peter
• Granted Patent: US 8,318,843 B2
• Time in Patent Office: Days
• US Class Current: 524/424
• CPC Class Codes: B29C 65/1616 Near infrared radiation [NIR], e.g. by YAG lasers
• CPC Class Codes: B29C 65/1635 at least passing through one of the parts to be joined, i.e. laser transmission welding
• CPC Class Codes: B29C 65/1654 scanning at least one of the parts to be joined
• CPC Class Codes: B29C 65/1667 at the same time, i.e. simultaneous laser welding
• CPC Class Codes: B29C 65/1674 making use of laser diodes B29C65/167 takes precedence
• CPC Class Codes: B29C 65/1677 making use of an absorber or impact modifier
• CPC Class Codes: B29C 65/1696 making use of masks
• CPC Class Codes: B29C 66/71 characterised by the composition of the plastics material of the parts to be joined welding bar compositions B29C65/125
• CPC Class Codes: B29C 66/73772 the to-be-joined areas of both parts to be joined being amorphous
• CPC Class Codes: B29C 66/73774 the to-be-joined areas of both parts to be joined being semi-crystalline
• CPC Class Codes: B29C 66/7392 characterised by the material of at least one of the parts being a thermoplastic
• CPC Class Codes: B29C 66/73921 characterised by the materials of both parts being thermoplastics
• CPC Class Codes: B29K 2067/00 Use of polyesters or derivatives thereof, as moulding material
• CPC Class Codes: C08K 3/26 Carbonates; Bicarbonates
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers

Abstract

Use of thermoplastic molding compositions comprising, as essential components,

• A) from 29 to 99.95% by weight of a polyester,
• B) from 0.05 to 2.0% by weight of Na₂CO₃, K₂CO₃, NaHCO₃, KHCO₃, or a mixture of these, based on 100% by weight of A) and B), and also
• C) from 0 to 70% by weight of further additives, where the total of the % by weight values for A) to C) is 100%,
  for producing laser-transparent moldings of any type.

Claims

1-9. -9. (canceled)

10. A component for producing laser-transparent moldings which comprise thermoplastic molding compositions comprising,

A) from 29 to 99.95% by weight of a polyester,

B) from 0.05 to 2.0% by weight of Na₂CO₃, K₂CO₃, NaHCO₃, KHCO₃, or a mixture of these, based on 100% by weight of A) and B), and

C) from 0 to 70% by weight of further additives, where the total of the % by weight values for A) to C) does not exceed 100%.

11. The component according to claim 10, where the molding compositions comprise, based on 100% by weight of A) and B), from 0.1 to 0.8% by weight of component B).

12. The component according to claim 10, where the laser transparency of the molding is at least 33% (measured at 1064 nm on a molding of thickness 2 mm).

13. The component according to claim 11, where the laser transparency of the molding is at least 33% (measured at 1064 nm on a molding of thickness 2 mm).

14. The component according to claim 10, where the aspect ratio of component B) is from 1 to 2.9.

15. The component according to claim 13, where the aspect ratio of component B) is from 1 to 2.9.

16. The component according to claim 10, where the d₅₀ value of the particle size of the particles of component B) is ≦

500 μ

m.

17. The component according to claim 15, where the d₅₀ value of the particle size of the particles of component B) is ≦

500 μ

m and the d₁₀ value of component B) is ≦

250 μ

m.

18. The component according to claim 10, where the d₁₀ value of component B) is ≦

250 μ

m.

19. A process for producing moldings by means of laser transmission welding processes of the component according to claim 10.

20. A process for producing a welded molding which comprises laser transmission welding to bond a laser-transparent molding composition to a laser-absorbent molding wherein said molding compositions comprising,

A) from 29 to 99.95% by weight of a polyester,

B) from 0.05 to 2.0% by weight of Na₂CO₃, K₂CO₃, NaHCO₃, KHCO₃, or a mixture of these, based on 100% by weight of A) and B), and

C) from 0 to 70% by weight of further additives, where the total of the % by weight values for A) to C) does not exceed 100%.

21. A welded molding obtainable according to the process of claim 20, wherein the molding is suitable for applications in the electrical, electronics, telecommunications, information-technology, computer, household, sports, medical, motor-vehicle, or entertainment sector.