Mica coated with metal oxide as a flame retardant

Patent metadata

Field	Value
Publication number	US-10988693-B2
Application number	US-201515533522-A
Country	US
Kind code	B2
Filing date	Dec 14, 2015
Priority date	Dec 15, 2014
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

The invention relates to the use of mica coated with at least one metal oxide as flame retardant, and also thermoplastic molding compositions provided therewith.

First claim

The invention claimed is:

1. A thermoplastic molding composition comprising:
a) from 30 to 90% by weight of at least one thermoplastic polymer as component A, wherein component A is at least one polyamide and/or polyester,
b) from 0.5 to 10% by weight of at least one mica coated with a metal oxide as component B, wherein the metal oxide coated on the at least one mica increases fire resistance of the thermoplastic molding composition as a flame retardant is present in an amount from 5 to 80% by weight relative to the mica and comprises (i) at least one of ZnO and V 2 O 5 , and (ii) not more than 20% by weight, based on the total amount of mica in the coating, of further metal oxides other than ZnO or V 2 O 5 ,
c) from 2 to 25% by weight of at least one flame retardant different from component B as component C,
d) from 0 to 35% by weight of at least one functional polymer different from component A as component D,
e) from 1 to 60% by weight of glass fibers as component E, and
f) from 0 to 10% by weight of further auxiliaries as component F,
wherein:
the total amount of the components A to E is 100% by weight.

2. The thermoplastic molding composition according to claim 1 , wherein component C is a phosphinic acid salt, a halogen-comprising flame retardant, phosphorus, a melamine compound, or a mixture of two or more thereof.

3. The thermoplastic molding composition according to claim 1 , wherein component C is selected from the group consisting of
c1) aluminum diethylphosphinate and/or aluminum hypophosphite,
c2) aluminum diethylphosphinate and/or aluminum phosphite in combination with at least one melamine compound,
c3) red phosphorus, and
c4) polypentabromobenzyl acrylate.

4. The thermoplastic molding composition according to claim 1 , wherein component D is present in an amount of 0.1 to 35% by weight and is poly(2,6-dimethyl-1,4-phenylene oxide).

5. The thermoplastic molding composition according to claim 1 , wherein the coating is free from metal oxides other than ZnO or V 2 O 5 .

6. The thermoplastic molding composition according to claim 1 , wherein the metal oxide coated on the at least one mica comprises: (i) ZnO, and (ii) not more than 10% by weight, based on the total amount of mica in the coating, of further metal oxides other than ZnO or V 2 O 5 .

7. The thermoplastic molding composition according to claim 1 , wherein:
the metal oxide coated on the at least one mica comprises: (i) V 2 O 5 , and (ii) not more than 10% by weight, based on the total amount of mica in the coating, of further metal oxides other than ZnO or V 2 O 5 .

8. The thermoplastic molding composition according to claim 1 , wherein the at least one thermoplastic polymer as component A is polybutylene terephthalate.

9. The thermoplastic molding composition according to claim 1 , wherein the at least one thermoplastic polymer as component A is at least one polyimide.

10. The thermoplastic molding composition according to claim 1 , wherein the thermoplastic molding composition comprises from 30 to 70% by weight of the at least one thermoplastic polymer as component A.

11. The thermoplastic molding composition according to claim 10 , wherein the metal oxide coated on the at least one mica comprises V 2 O 5 .

12. The thermoplastic molding composition according to claim 1 , wherein:
the metal oxide coated on the at least one mica comprises: (i) V 2 O 5 , and (ii) not more than 10% by weight, based on the total amount of mica in the coating, of further metal oxides other than ZnO or V 2 O 5 ; and
the at least one thermoplastic polymer as component A is at least one polyamide.

13. The thermoplastic molding composition according to claim 1 , wherein the metal oxide coated on the at least one mica in component B is present in an amount from 20 to 50% by weight relative to the mica.

14. The thermoplastic molding composition according to claim 1 , wherein:
component A is present in an amount from 30 to 70% by weight;
component B is present in an amount from 0.5 to 5% by weight;
component C is present in an amount from 2 to 25% 5 to 20% by weight; and
component E is present in an amount from 5 to 50% by weight.

15. The thermoplastic molding composition according to claim 1 , wherein:
component A is present in an amount from 50 to 65% by weight;
component B is present in an amount from 0.5 to 2% by weight;
component C is present in an amount from 5 to 20% 8 to 20% by weight; and
component E is present in an amount from 10 to 40% by weight.

16. A process for producing thermoplastic molding compositions according to claim 1 by mixing the constituents.

17. A molding, fiber, or film comprising a thermoplastic molding composition according to claim 1 .

18. A process for producing moldings, fibers, or films comprising melting, extruding, and subsequent shaping of a thermoplastic molding composition according to claim 1 .

Assignees

• Basf Se

Inventors

• Krämer Roland Helmut
• Deglmann Peter
• Wosylus Aron
• Wagner Sebastian
• Choi Sung Yeun
• Roth Michael
• Uske Klaus

Classifications

• C08L2201/02

  Flame or fire retardant/resistant · CPC title

• C08L77/06

  Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence) · CPC title

• C08L67/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) · CPC title

• C08K7/14

  Glass · CPC title

• C08K5/5313

  Phosphinic compounds, e.g. R2=P(:O)OR' · CPC title