Thermoplastically processible molding material

• US 5,958,283 A
• Filed: 12/17/1997
• Issued: 09/28/1999
• Est. Priority Date: 12/19/1996
• Status: Expired due to Fees

• Current Assignee: Uhde Inventa-Fischer AG (Thyssenkrupp AG)
• Original Assignee: EMS-Inventa AG (Emesta Holding AG)
• Inventors: Aepli, Etienne, Jarvis, David, Tuor, Gion Antoni, Schmid, Eduard, Laudonia, Ivano
• Primary Examiner(s): KOSLOW, CAROL M
• Application Number:
  US08/991,987
• Time in Patent Office: 650 Days
• Field of Search: 252/62.54, 252/62.55, 524/431, 524/435, 524/440, 524/785, 264/429
• US Class Current: 252/62.54
• CPC Class Codes: H01F 1/0578 bonded together
• CPC Class Codes: H01F 1/083 in a bonding agent

Abstract

The invention relates to a thermoplastically processible molding material with a two-phase matrix of a partially aromatic copolyamide and an aliphatic polyamide or copolyamide containing permanently magnetic or magnetizable fillers, as well as to a method for producing this molding material and using it for producing molded parts.

Claims

1. A thermoplastically processible molding material, consisting of a two-phase matrix a) of

a1) 70 to 99 weight-% of a partially aromatic copolyamide containing an aliphatic dicarboxylic acid component, said aliphatic dicarboxylic acid component being present in a proportion of less than 50 mol-% of the entire acid components, said partially aromatic copolyamide having a melting point of more than 280°

C.,

a2) 1 to 30 weight-% of an aliphatic polyamide or copolyamide with a statistical mean value of at least 10 --CH₂ groups per --CONH-- group,

and

a3) 0 to 10 weight-% of property-relevant and/or process-conditional additives, wherein the sum of the matrix components a1) to a3) is 100 weight-%,

and

b) in relation to the total volume of the molding material, at least 30 vol.-% of a permanently magnetic or magnetizable metal compound and/or metal allow incorporated into the matrix as a filler with a homogeneous distribution to the matrix.

2. The molding material in accordance with claim 1, characterized in that the matrix a) consists of 80 to 97 weight-% of a partially aromatic copolyamide a1) and 20 to 3 weight-% of an aliphatic polyamide or copolyamide a2).

3. The molding material in accordance with claim 1, characterized in that the partially aromatic copolyamide a1) has a melting point of at least 300°

C.

4. The molding material in accordance with claim 1, characterized in that the aliphatic copolyamide a2) contains dimerized fatty acid with 36 to 44 C atoms as co-components.

5. The molding material in accordance with claim 1, characterized in that the aliphatic polyamide or copolyamide a2) has an excess of amino end groups.

6. The molding material in accordance with claim 5, characterized in that the aliphatic polyamide or copolyamide a2) has amino end groups of the type --NH₂ and/or NHR'"'"', wherein R'"'"' is an alkyl radical or cyclohexyl radical, or the amino group is a component of a cyclo-aliphatic radical.

7. The molding material in accordance with claim 5, characterized in that aliphatic polyamide or copolyamide a2) has 50 to 200 μ

eq/g of amino end groups.

8. The molding material in accordance with claim 5, characterized in that the additive a3) is at least one alkylamine.

9. The molding material in accordance with claim 8, characterized in that the alkylamine a3) is an amine of the formula 1, wherein n is 1 to 3 and R is an alkyl radical with 12 to 44 C atoms, optionally substituted with hetero-atoms:

space="preserve" listing-type="equation">R--(HN--CH.sub.2 CH.sub.2 CH.sub.2).sub.n --NH.sub.2 (I).

10.

10. The molding material in accordance with claim 5, characterized in that the metal compound or the metal alloy b) is provided in a volume portion of at least 45%.

11. The molding material in accordance with claim 5, characterized in that the metal compound or the metal alloy b) is provided in a volume portion of at least 55%.

12. The molding material according to claim 5, wherein the metal compound or metal alloy is provided in an amount by weight of 83-89%.

13. The molding material of claim 1, wherein said aliphatic dicarboxylic acid comprises adipic acid.

14. A thermoplastically processible molding material, consisting of a two-phase matrix a) of

a1) a copolyamide which consists of 55 mol-% of hexamethyleneterephthalamide units and 45 mol-% of hexamethyleneadipamide units, having a melting point of more than 280°

C.,

a2) 1 to 30 weight-% of an aliphatic polyamide or copolyamide with a statistical mean value of at least 10 --CH₂, groups per --CONH-- group,

and

a3) 0 to 10 weight-% of Property-relevant and/or process-conditional additives, wherein the sum of the matrix components a1) to a3) is 100 weight-%,

and

b) in relation to the total volume of the molding material, at least 30 vol.-% of a permanently magnetic or magnetizable metal compound and/or metal alloy incorporated into the matrix as a filler with a homogeneous distribution to the matrix.

15. The molding material in accordance with claim 14, wherein the aliphatic copolyamide a2) contains dimerized fatty acid with 36 to 44 C atoms as co-components.

16. The molding material in accordance with claim 14, wherein the aliphatic polyamide or copolyamide a2) has an excess of amino end groups.

17. The molding material in accordance with claim 14, wherein the aliphatic polyamide or copolyamide a2) has amino end groups of the type --NH2 and/or NHR'"'"', wherein R'"'"' is an alkyl radical or cyclohexyl radical, or the amino group is a component of a cyclo-aliphatic radical.

18. The molding material in accordance with claim 14, wherein the aliphatic polyamide or copolyamide a2) has 50 50 200 μ

eq./g of amino end groups.

19. The molding material in accordance with claim 14, wherein the additive a3) is at least one alkylamine.

20. The molding material in accordance with claim 14, wherein the alkylamine a3) is an amine of the formula I, wherein n is 1 to 3 and R is an alkyl radical with 12 to 44 C atoms, optionally substituted with hetero-atoms:

space="preserve" listing-type="equation">R--(HN--CH.sub.2 CH.sub.2 CH.sub.2).sub.n --NH.sub.2 (I).

21. The molding material in accordance with claim 14, wherein the metal compound or the metal alloy b) is provided in a volume portion of at least 45%.

22. The molding material in accordance with claim 14, wherein that the metal compound or the metal alloy b) is provided in a volume portion of at least 55%.

23. A method for producing a thermoplastically processible molding material consisting of a two-phase matrix a) of

a1) 70 to 99 weight-% of a partially aromatic copolyamide containing dicarboxylic acid components with a proportion of aliphatic dicarboxylic acid of less than 50 mol-% of the entire acid components and a melting point of more than 280°

C.,

a2) 1 to 30 weight-% of an aliphatic polyamide or copolyamide with a statistical mean value of at least 10 --CH₂ -groups per --CONH-- group,

and

a3) 0 to 10 weight-% of property-relevant and/or process-conditional additives, wherein the sum of the matrix components a1) to a3) is 100 weight-%,

and

b) in relation to the total volume of the molding material, at least 30 vol.-% of a permanently magnetic or magnetizable metal compound and/or metal alloy incorporated into the matrix as a filler with a homogeneous distribution to the matrix, said method comprising;

melting and homogeneously mixing the matrix components a1) and a2) including the additives a3) under the protection of an inert gas, subsequently adding and homogeneously admixing the metal compound or metal alloy therewith to provide a molten mixture, and extruding said molten mixture, cooling, comminuting and drying.

24. The method in accordance with claim 23, wherein said metal compounds or metal alloys are coated.