Thermoplastic molding composition

• US 8,987,357 B2
• Filed: 05/25/2012
• Issued: 03/24/2015
• Est. Priority Date: 05/27/2011
• Status: Expired due to Fees

• Current Assignee: BASF SE
• Original Assignee: BASF SE
• Inventors: Cristadoro, Anna, Knig, Alexander, Roth, Michael
• Primary Examiner(s): SANDERS, KRIELLION ANTIONETTE
• Application Number:
  US13/481,402
• Publication Number:
  US 20120302677A1
• Time in Patent Office: 1,033 Days
• Field of Search: 524/86, 524/538, 524/539, 524/100, 524/133, 524/135, 524/414
• US Class Current: 524/86
• CPC Class Codes: C08K 2003/026 Phosphorus
• CPC Class Codes: C08K 3/38 Boron-containing compounds
• CPC Class Codes: C08K 5/0066 Flame-proofing or flame-retarding additives
• CPC Class Codes: C08K 5/5313 Phosphinic compounds, e.g. R2=P(:O)OR'
• CPC Class Codes: C08K 7/14 Glass
• CPC Class Codes: C08L 77/02 Polyamides derived from omega-amino carboxylic acids or from lactams thereof C08L77/10 takes precedence
• CPC Class Codes: C08L 77/06 Polyamides derived from polyamines and polycarboxylic acids C08L77/10 takes precedence
• CPC Class Codes: C08L 79/08 Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
• CPC Class Codes: C09D 177/02 Polyamides derived from omega-amino carboxylic acids or from lactams thereof C09D177/10 takes precedence
• CPC Class Codes: C09D 177/06 Polyamides derived from polyamines and polycarboxylic acids C09D177/10 takes precedence

Abstract

The present invention relates to a thermoplastic molding composition comprising the following components:

• • A) 20 to 98.99% by weight of at least one polyamide,
  • B) 0.01 to 40% by weight of at least one branched polyimide selected from condensates of either
    • b1) at least one polyisocyanate having an average of more than two isocyanate groups per molecule or
    • b2) at least one polyamine having an average of more than two amino groups per molecule and
    • b3) at least one polycarboxylic acid having at least three COOH groups per molecule or its anhydride
  • C) 1 to 59% by weight of at least one flame retardant selected from the group of
  • c1) phosphorus-containing flame retardants
  • c2) nitrogen-containing flame retardants
  • and mixtures of these,
  • D) 0 to 50% by weight of further additives,
  • where the total of the proportions by weight is 100% by weight based on the molding composition.

Claims

1. A thermoplastic molding composition comprising

A) from 20 to 98.99% by weight of at least one polyamide,

B) from 0.01 to 40% by weight of at least one branched polyimide, selected from condensates of either

b1) at least one polyisocyanate having an average of more than two isocyanate groups per molecule or

b2) at least one polyamine having an average of more than two amino groups per molecule with

b3) at least one polycarboxylic acid having at least three COOH groups per molecule or its anhydride,

C) from 1 to 59% by weight of at least one flame retardant selected from the group of

c1) the phosphorus-containing flame retardants

c2) the nitrogen-containing flame retardants

and mixtures of these,

D) from 0 to 50% by weight of further additives,

where the total of the proportions by weight does not exceed 100% based on the molding composition.

2. The thermoplastic molding composition according to claim 1, wherein the polycarboxylic acid (b3) comprises a polycarboxylic acid having at least four COOH groups per molecule or the relevant anhydride.

3. The thermoplastic molding composition according to claim 1, wherein the polyisocyanate (b1) has been selected from oligomeric hexamethylene diisocyanate, oligomeric tetramethylene diisocyanate, oligomeric isophorone diisocyanate, oligomeric diphenylmethane diisocyanate, trimeric tolylene diisocyanate and mixtures of the abovementioned polyisocyanates.

4. The thermoplastic molding composition according to claim 1, where the polyimide (B) is selected from polyimides which have a molar mass M_w of from 1000 to 200 000 g/mol.

5. The thermoplastic molding composition according to claim 1, where the polydispersity M_w/M_n of the polyimide (B) is at least 1.4.

6. The thermoplastic molding composition according to claim 1, where the degree of branching of the polyimide (B) is from 10 to 99.9%.

7. The thermoplastic molding composition according to claim 1, where the nitrogen-containing flame retardant c2) used comprises a heterocyclic compound which comprises at least one nitrogen atom.

8. A coating material comprising the thermoplastic molding composition according to claim 1.

9. A fiber, foil or molding comprising a thermoplastic molding composition according to claim 1.