INFRARED TRANSMISSIVE THERMOPLASTIC COMPOSITION

• US 20080103267A1
• Filed: 10/31/2006
• Published: 05/01/2008
• Est. Priority Date: 10/31/2006
• Status: Abandoned Application

• Current Assignee: Sabic Innovative Plastics IP BV (Government of Saudi Arabia)
• Original Assignee: General Electric Company
• Inventors: Hurst, Jeremy D., Yao, Wayne, Puyenbroek, Robert, Qu, Zhaohui
• Application Number:
  US11/554,750
• Publication Number:
  US 20080103267A1
• Time in Patent Office: Days
• US Class Current: 525/464
• CPC Class Codes: C08K 13/00 Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
• CPC Class Codes: C08K 3/013 Fillers, pigments or reinforcing additives
• CPC Class Codes: C08K 5/0041 Optical brightening agents, organic pigments
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 2666/18 Polyesters or polycarbonates according to C08L67/00 - C08L69/00; Derivatives thereof
• CPC Class Codes: C08L 69/00 Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/10 Block- or graft-copolymers containing polysiloxane sequences obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C08L51/08, C08L53/00

Abstract

A thermoplastic composition comprises an aromatic polycarbonate; a polycarbonate-polysiloxane copolymer; and a dye combination comprising a dark color dye, wherein the siloxane domains in the composition have an average domain size of between 15 and 45 nanometers, wherein a molded article having a thickness of 1.0 millimeters comprising the thermoplastic composition has a percent transmission of infrared light of greater than or equal to 65%, when measured at a wavelength of 800 nm, and a dE flop of less than 6.

Claims

1. A thermoplastic composition comprising:

from 0.5 wt. % to 96.99 wt. % of an aromatic polycarbonate;

from 3 wt. % to 99.49 wt. % of a polycarbonate-polysiloxane copolymer; and

from 0.01 wt. % to 5.0 wt. % of a dye combination comprising a dark color dye;

wherein the siloxane domains in the composition have an average domain size of between 15 and 45 nanometers,

wherein a molded article having a thickness of 1.0 millimeters comprising the thermoplastic composition has a percent transmission of infrared light of greater than or equal to 65%, when measured at a wavelength of 800 nm, and

a dE flop of less than 6.

2. The thermoplastic composition of claim 1 wherein total siloxane content, based on the total composition, is at least 1.5 wt. %.

3. The thermoplastic composition of claim 1 wherein total siloxane content, based on the total composition, is at least 2.0 wt. %.

4. The thermoplastic composition of claim 1 wherein total siloxane content, based on the total composition, is at least 2.3 wt. %.

5. The thermoplastic composition of claim 1, wherein the dE flop is less than 4.

6. The thermoplastic composition of claim 1, wherein a molded article having a thickness of 1.0 millimeters comprising the thermoplastic composition has a percent transmission of infrared light of greater than or equal to 65%, when measured at a wavelength of 1060 nm.

7. The thermoplastic composition of claim 1, wherein the dye or dye combination is black.

8. The thermoplastic composition of claim 1, wherein a molded article having a thickness of 1.0 millimeters comprising the thermoplastic composition has a percent transmission of infrared light of greater than or equal to 80%, when measured at a wavelength of 800 nm.

9. The thermoplastic composition of claim 1, further comprising a flame retardant.

10. The thermoplastic composition of claim 1, further comprising a second polycarbonate-polysiloxane copolymer.

11. An article comprising the thermoplastic composition of claim 1.

12. The article of claim 11, wherein the article is suitable for laser welding.

13. A thermoplastic composition comprising:

from 50 wt. % to 96.99 wt. % of an aromatic polycarbonate;

from 3 wt. % to 45 wt. % of a polycarbonate-polysiloxane copolymer; and

from 0.01 wt. % to 5.0 wt. % of a dye combination comprising a dark color dye;

wherein the siloxane domains in the composition have an average domain size of between 15 and 45 nanometers and the total siloxane content, based on the total composition, is at least 1.5 wt. %,

wherein a molded article having a thickness of 1.0 millimeters comprising the thermoplastic composition has a percent transmission of infrared light of greater than or equal to 65%, when measured at a wavelength of 800 nm, and

a dE flop of less than 6.

14. The thermoplastic composition of claim 13 wherein total siloxane content, based on the total composition, is at least 2.0 wt. %.

15. The thermoplastic composition of claim 13, wherein the dE flop is less than 4.

16. The thermoplastic composition of claim 13, further comprising a second polycarbonate-polysiloxane copolymer.

17. An article comprising the thermoplastic composition of claim 13.

18. The thermoplastic composition of claim 13, wherein a molded article having a thickness of 1.0 millimeters comprising the thermoplastic composition has a percent transmission of infrared light of greater than or equal to 80%, when measured at a wavelength of 800 nm.

19. A thermoplastic composition comprising:

from 0.5 wt. % to 96.99 wt. % of an aromatic polycarbonate;

from 3 wt. % to 99.49 wt. % of two polycarbonate-polysiloxane copolymers, wherein at least one polycarbonate-polysiloxane copolymer is transparent; and

from 0.01 wt. % to 5.0 wt. % of a dye combination comprising a dark color dye;

wherein the siloxane domains in the composition have an average domain size of between 15 and 45 nanometers and the total siloxane content, based on the total composition, is at least 1.5 wt. %,

wherein a molded article having a thickness of 1.0 millimeters comprising the thermoplastic composition has a percent transmission of infrared light of greater than or equal to 65%, when measured at a wavelength of 800 nm, and

a dE flop of less than 6.

20. The thermoplastic composition of claim 19, wherein the dE flop is less than 4.