Laser-transparent PBT with organic additives

• US 8,889,768 B2
• Filed: 06/10/2011
• Issued: 11/18/2014
• Est. Priority Date: 06/11/2010
• Status: Active Grant

• Current Assignee: BASF SE
• Original Assignee: BASF SE
• Inventors: von Benten, Rebekka, Eibeck, Peter, Heckmann, Walter, Kurikov, Jordan, Pulbere, Mariou Sorin
• Primary Examiner(s): SANDERS, KRIELLION ANTIONETTE
• Application Number:
  US13/157,965
• Publication Number:
  US 20110306707A1
• Time in Patent Office: 1,257 Days
• Field of Search: 524/396, 524/84, 524/99, 524/104, 524/161, 524/327, 156/272.8
• US Class Current: 524/84
• CPC Class Codes: C08K 5/0008 Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence

Abstract

Use of thermoplastic molding compositions comprising, as essential components,

• A) a polyester,
• B) from 20 to 200 mmol/kg of polyester A) of at least one compound of the general formula (I)

• • where
  • respectively independently at any position
  • -A¹- is —NR—, —O—, —S—, —CH=A⁴- where R is H or C_1-6-alkyl, A⁴ is N or CH
  • A² is COOX or OX, where X is Li, Na, K, Rb, Cs, Mg/2, Ca/2, Sr/2, Ba/2, Al/3
  • A³ is C_1-6-alkyl, C_6-12-aryl, O_7-13-alkaryl, C_7-13-aralkyl, O—C_1-6-alkyl, O—C_6-12-aryl, O—C_7-13-alkaryl, O—C_7-13-aralkyl, COOX′, OX′, SX′, SO₃X′, where X′ is H or X, S—C_1-6-alkyl, S—C_6-12-aryl, NR₂, halogen, NO₂,
  • n is an integer from 1 to 4, and
  • m is an integer from 0 to 4−n, where m=1, if A³=NO₂,
  • with the proviso that the number of mmol is based on the group(s) COOX and OX and SX′ where X′═X, to the extent that these are present in the compound of the general formula (I), and also moreover
• C) from 0 to 230% by weight of further added substances, based on the weight of component A),
  for producing laser-transparent moldings of any type.

Claims

1. A laser-transparent molding comprising a thermoplastic molding composition comprising,

A) a polyester,

B) from 20 to 200 mmol/kg of polyester A) of at least one compound selected from the group consisting of sodium isonicotinate, sodium 2-thiophenecarboxylic acid, sodium pyrrole-2-carboxylate, sodium phenolate and sodium phenylacetate, and

C) from 0 to 230% by weight of further added substances, based on the weight of component A).

2. The molding according to claim 1, where the molding composition comprises from 25 to 140 mmol/kg of polyester A of component B).

3. The molding according to claim 1, where the laser transparency (LT) of the molding is at least 33% (measured at 1064 nm on a molding of thickness 2 mm) based on the formula:

LT=(Signal(measurement sensor)/Signal(reference sensor))×

100%.

4. The molding according to claim 1, wherein X is Li, Na, K, Rb or Cs.

5. The molding according to claim 4, wherein X is Li, Na or K.

6. The molding according to claim 1 obtained via laser transmission welding.

7. The moldings according to claim 1, wherein laser transmission welding is used to bond the laser-transparent moldings to laser-absorbent moldings.