Plastic moulding compound and use thereof

Patent metadata

Field	Value
Publication number	US-9815981-B2
Application number	US-201414572055-A
Country	US
Kind code	B2
Filing date	Dec 16, 2014
Priority date	Dec 20, 2013
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

Thermoplastic, flame-retarded plastic molding compounds with improved mechanical properties, in particular for LDS applications, are described. The thermoplastic molding compound consists of:
(A) 21-81.9 wt. % thermoplastic material, consisting of
(A1) 55-100 wt. % polyamide, containing at least 50 wt. % partly aromatic, partly crystalline polyamide; (A2) 0-45 wt. % non-polyamide based thermoplastic material, wherein (A1) and (A2) add up to 100 wt. % component (A);
(B) 10-70 wt. % glass fibers; (C) 0.1-10 wt. % LDS additive or a mixture of LDS additives; (D) 8-18 wt. % halogen-free flame retardant; (E) 0-40 wt. % particulate filler, different from (C); (F) 0-2 wt. % other further additives;

wherein the sum of (A)-(F) makes up 100 wt. %.

First claim

The invention claimed is:

1. A thermoplastic moulding compound consisting of:
(A) 21-81.9 wt. % polyamide, consisting of 65-95 wt. % partly aromatic, partly crystalline polyamide, selected from the group consisting of 10T/6T, 6T/6I and mixtures thereof and 5-35 wt % amorphous, partly aromatic polyamide consisting of 6I/6T;
(B) 10-70 wt. % glass fibres;
(C) 0.1-10 wt. % LDS additive or a mixture of LDS additives;
(D) 8-18 wt. % halogen-free flame retardant;
(E) 0-40 wt. % particulate filler, different from (C); and
(F) 0-2 wt. % other further additives,
wherein the sum of (A)-(F) makes up 100 wt. %.

2. The thermoplastic moulding compound according to claim 1 , wherein the content of component (A) lies in the range from 25-75.5 wt. %, based on the sum of (A)-(F).

3. The thermoplastic moulding compound according to claim 1 , wherein the content of component (B) lies in the range from 15-60 wt. %, based on the sum of (A)-(F).

4. The thermoplastic moulding compound according to claim 1 , wherein the glass fibres of component (B) are selected as E-glass fibres according to ASTM D578-00, or are selected as high-strength glass fibres based on the ternary system silicon dioxide-aluminium oxide-magnesium oxide or on the quaternary system silicon dioxide-aluminium oxide-magnesium oxide-calcium oxide.

5. The thermoplastic moulding compound according to claim 1 , wherein the glass fibres of component (B) are glass fibres with non-circular cross section, wherein the dimension ratio of the major cross-sectional axis to the minor cross-sectional axis lying perpendicular thereto is more than 2.5.

6. The thermoplastic moulding compound according to claim 1 , wherein the content of component (C) lies in the range from 0.5-8 wt. % based on the sum of (A)-(F).

7. The thermoplastic moulding compound according to claim 1 , wherein component (C) contains at least one LDS additive or is entirely formed by an LDS additive selected from the following group: metal oxide, metal phosphate.

8. The thermoplastic moulding compound according to claim 1 , wherein the content of component (D) lies in the range from 11-17 wt. % based on the sum of (A)-(F).

9. The thermoplastic moulding compound according to claim 1 , wherein the halogen-free flame retardant (D) is a phosphorus-based flame retardant.

10. The thermoplastic moulding compound according to claim 1 , wherein component (D) consists of:
(D1) 60-100 wt. % of one or more of at least one of: phosphinic acid salts, diphosphinic acid salts, wherein a metal ion thereof is independently selected from the group consisting of:
aluminium, calcium, barium, zinc or combinations thereof;
(D2) 0-30 wt. % of a at least one of: nitrogen-containing synergist, nitrogen-containing flame retardant; and
(D3) 0-10 wt. % flame retardancy stabilizers,

wherein (D1), (D2) and (D3) add up to 100 wt. % component (D).

11. The thermoplastic moulding compound according to claim 1 , wherein the content of component (E) lies in the range from 0-25 wt. %, based on the sum of (A)-(F).

12. A component comprising the thermoplastic moulding compound according to claim 1 .

13. The thermoplastic moulding compound according to claim 1 , wherein the partly crystalline, partly aromatic polyamide of component (A) has a melting enthalpy determined by DSC (ISO Standard 11357-11-2) in the range from 25 to 80 J/g.

14. The thermoplastic moulding compound according to claim 1 , wherein the partly crystalline, partly aromatic polyamide of component (A) has a melting enthalpy determined by DSC (ISO Standard 11357-11-2) in the range from 30 to 70 J/g.

15. The thermoplastic moulding compound according to claim 1 , wherein the content of component (A) lies in the range from 30-71 wt. %, based on the sum of (A)-(F).

16. The thermoplastic moulding compound according to claim 1 , wherein the content of component (B) lies in the range from 20-45 wt. %, based on the sum of (A)-(F).

17. The thermoplastic moulding compound according to claim 1 , wherein the glass fibres of component (B) are selected as E-glass fibres according to ASTM D578-00, with non-circular cross section,
or are selected as high-strength glass fibres, with non-circular cross section, based on the ternary system silicon dioxide-aluminium oxide-magnesium oxide or on the quaternary system silicon dioxide-aluminium oxide-magnesium oxide-calcium oxide.

18. The thermoplastic moulding compound according to claim 1 , wherein the glass fibres of component (B) are selected as E-glass fibres according to ASTM D578-00, of 52-62% silicon dioxide, 12-16% aluminium oxide, 16-25% calcium oxide, 0-10% borax, 0-5% magnesium oxide, 0-2% alkali metal oxides, 0-1.5% titanium dioxide and 0-0.3% iron oxide,
or are selected as high-strength glass fibres, based on the ternary system silicon dioxide-aluminium oxide-magnesium oxide or on the quaternary system silicon dioxide-aluminium oxide-magnesium oxide-calcium oxide, wherein they have the following composition: 58-70 wt. % silicon dioxide (SiO 2 ), 15-30 wt. % aluminium oxide (Al 2 O 3 ), 5-15 wt. % magnesium oxide (MgO), 0-10 wt. % calcium oxide (CaO) and 0-2 wt. % further oxides, including zirconium dioxide (ZrO 2 ), boron oxide (B 2 O 3 ), titanium dioxide (TiO 2 ) or lithium oxide (Li 2 O) or a combination of these oxides.

19. The thermoplastic moulding compound according to claim 1 , wherein the glass fibres of component (B) are glass fibres with non-circular cross section, wherein the dimension ratio of the major cross-sectional axis to the minor cross-sectional axis lying perpendicular thereto lies in the range from 3 to 5.

20. The thermoplastic moulding compound according to claim 1 , wherein the content of component (C) lies in the range from 1-6 wt. %, based on the sum of (A)-(F).

21. The thermoplastic moulding compound according to claim 1 , wherein component (C) contains at least one LDS additive or is entirely formed by an LDS additive selected from the following group: metal oxide, alkaline metal phosphate, metal hydroxide phosphate, or a mixture thereof.

22. The thermoplastic moulding compound according to claim 1 , wherein component (C) contains at least one LDS additive or is entirely formed by an LDS additive which is an inorganic compound based on copper and/or tin.

23. The thermoplastic moulding compound according to claim 1 , wherein component (C) contains at least one LDS additive or is entirely formed by an LDS additive selected from the following group: tin oxide; metal- or metal oxide-doped tin oxide; antimony-doped tin oxide; metal oxide-coated mica; mica coated with antimony-doped tin oxide; mixture of tin oxide and antimony oxide with or without further metal oxides; spinels; copper-chromium oxide; copper oxide; copper hydroxide; copper hydroxide phosphate; copper phosphate; alkaline copper phosphate; copper-tin phosphate; alkaline copper-tin phosphate; tin phosphate; alkaline tin phosphate; antimony-doped tin oxide, in combination with or not in combination with mica; or mixtures and combinations thereof.

24. The thermoplastic moulding compound according to claim 1 , wherein the content of component (D) lies in the range from 13-16 wt. %, based on the sum of (A)-(F).

25. The thermoplastic moulding compound according to claim 1 , wherein the halogen-free flame retardant (D) is a phosphorus-based flame retardant, and wherein it contains at least one species selected from a reaction product of melamine with phosphoric

Assignees

• EMS—Patent AG
• Ems Patent Ag

Inventors

• Aepli Etienne

Classifications

• C08K3/24 Primary

  Acids; Salts thereof {(C08K3/16 takes precedence)} · CPC title

• C08K3/32

  Phosphorus-containing compounds · CPC title

• C08L2205/16

  Fibres; Fibrils · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08K5/34928

  Salts · CPC title