Flame-retardant, glass fiber-containing molding compounds containing siloxane-containing polycarbonate block co-condensate

Patent metadata

Field	Value
Publication number	US-10717871-B2
Application number	US-201615544277-A
Country	US
Kind code	B2
Filing date	Jan 18, 2016
Priority date	Jan 20, 2015
Publication date	Jul 21, 2020
Grant date	Jul 21, 2020

Abstract

The present invention relates to flame-retardant moulding compositions comprising glass fibre and siloxane-containing polycarbonate block cocondensate, and also to a process for the production of these moulding compositions. The invention further relates to the use of these flame-retardant moulding compositions in injection-moulding and extrusion applications.

First claim

The invention claimed is:

1. A flame-retardant, thermoplastic moulding composition comprising
(A) at least 20% by weight of a polysiloxane-polycarbonate block cocondensate comprising siloxane blocks of the structure (1)

where
R 1 is H, Cl, Br or C 1 to C 4 -alkyl,
R 2 and R 3 are selected mutually independently from aryl, C 1 to C 10 -alkyl and C 7 to C 10 -alkylaryl,
X is a single bond, —CO—, —O—, C 1 - to C 6 -alkylene, C 2 to C 5 -alkylidene, C 5 to C 12 -cycloalkylidene or C 6 to C 12 -arylene, which can have been condensed with another aromatic ring comprising heteroatoms,
n is an average value from 1 to 500,
m is an average value from 2 to 10 and
p is 0 or 1,

(B) from 5.0 to 60.0% by weight of at least one (co)polycarbonate based on bisphenol A and optionally on at least one other diphenol,
(C) from 8.0 to 30.0% by weight of glass fibres,
(D) from 0.05 to 10.0% by weight of titanium dioxide,
(E) from 0.03 to 0.15% by weight of polytetrafluoroethylene
or from 0.05 to 0.40% by weight of polytetrafluoroethylene blends which comprise from 30 to 70% by weight of polytetrafluoroethylene,

(F) from 0.1 to 0.6% by weight of at least one sulphonic salt, and
(G) from 0.05 to 0.5% by weight of at least one UV absorber.

2. The moulding composition according to claim 1 , wherein at least one sulphonic salt of the general formulae (4) and (5) is present as component (C)

where
R 4 , R 5 , R 6 and R 7 are respectively mutually independently a C 1 to C 6 -alkyl moiety,
Me and M are respectively a metal,
a and n are 1, 2 or 3,
b and w are integers from 0 to 5, and
x and y are integers from 0 to 4.

3. The moulding composition according to claim 1 , wherein polytetrafluoroethylene with average particle diameter from 100 to 1000 μm is present as component (E).

4. The moulding composition according to claim 1 , wherein at least one polytetrafluoroethylene blend is present as component (E) in the moulding compositions, where the polytetrafluoroethylene blend comprises a polytetrafluoroethylene core and a coating made of at least one polyvinyl derivative.

5. The moulding composition according to claim 1 , wherein the UV absorber is 2-(3′,5′-bis(1,1-dimethylbenzyl)-2′-hydroxyphenyl)benzotriazole.

6. The moulding composition according to claim 1 , wherein homopolycarbonate based on bisphenol A is present as component (B).

7. The moulding composition according to claim 1 composed of components (A) to (G) and
(H) from 0.00% by weight to 1.00% by weight of at least one mould-release agent; and/or
(I) from 0.00% by weight to 0.20% by weight of one or more heat stabilizers and/or processing stabilizers; and/or
(J) from 0.00 to 10.00% by weight of other additives which differ from components (B) to (I).

8. The moulding composition according to claim 1 , wherein the quantity present of component (A) in the moulding compositions is at least 50% by weight.

9. The moulding composition according to claim 1 , wherein the polysiloxane-polycarbonate block cocondensate comprises polycarbonate blocks based on bisphenol A.

10. The moulding composition according to claim 1 , wherein the content of siloxane blocks of the structure (1) is from 2 to 20% by weight, based on the total weight of the moulding compositions.

11. The moulding composition according to claim 1 , wherein the UL 94 classification of an injection moulding produced therefrom, for thickness 1.5 mm, is V-0.

12. The moulding composition according to claim 1 , wherein the energy absorbed in the Izod notched impact test on injection mouldings produced therefrom is >25 kJ/m 2 , measured in accordance with ISO 180/1A at 23° C. on test specimens measuring 80×10×3 mm.

13. The moulding composition according to claim 1 , wherein the polysiloxane-polycarbonate block cocondensate comprises one or more structures of the formulae (I), (II), (III) and (IV):

where
the phenyl rings are unsubstituted or mutually independently mono- or disubstituted with C 1 to C 8 -alkyl and/or halogen,
X is a single bond, C 1 to C 6 -alkylene, C 2 to C 5 -alkylidene or C 5 to C 6 -cycloalkylidene, and
the linkages indicated by --- in the structural units (I) to (IV) are respectively part of a carboxy group.

Assignees

• Covestro Deutschland Ag

Inventors

• Meyer Alexander
• Horn Klaus
• Kuhlmann Timo
• Erkelenz Michael
• Liesenfelder Ulrich

Classifications

• C08K2003/2237

  of titanium · CPC title

• C08L27/18

  Homopolymers or copolymers or tetrafluoroethene · CPC title

• C08K5/42

  Sulfonic acids; Derivatives thereof · CPC title

• C08K7/14

  Glass · CPC title

• C08K3/22

  of metals · CPC title