Flame resistant polycarbonate/ABS moulding compounds resistant to stress cracking

• US 5,672,645 A
• Filed: 12/12/1996
• Issued: 09/30/1997
• Est. Priority Date: 08/26/1993
• Status: Expired

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Wittmann, Dieter, Eckel, Thomas, Alberts, Heinrich, Oller, Manfred
• Primary Examiner(s): Hoke, Veronica P.
• Application Number:
  US08/764,747
• Time in Patent Office: 292 Days
• Field of Search: 524/126, 524/127, 524/141
• US Class Current: 524/127
• CPC Class Codes: C08K 5/523 with hydroxyaryl compounds
• CPC Class Codes: C08L 25/02 Homopolymers or copolymers of hydrocarbons
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 27/12 containing fluorine atoms
• CPC Class Codes: C08L 27/18 Homopolymers or copolymers or tetrafluoroethene
• CPC Class Codes: C08L 33/06 of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
• CPC Class Codes: C08L 51/04 grafted on to rubbers
• CPC Class Codes: C08L 69/00 Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• CPC Class Codes: C08L 85/02 containing phosphorus

Abstract

Flame resistant, thermoplastic molding compounds containing

A) 40 to 98 parts by weight of an aromatic polycarbonate,

B) 3 to 50 parts by weight of a vinyl copolymer,

C) 0.5 to 40 parts by weight of a graft polymer,

D) 0.5 to 20 parts by weight of a mixture of

D.1) 10 to 90 wt. %, related to D) , of a monophosphorus compound of the formula (I) ##STR1## D.2) 90 to 10 wt. %, related to D), of an oligomeric phosphorus compound of the formula (II) ##STR2## and E) 0.05 to 5 parts by weight of a fluorinated polyolefin with an average particle diameter of 0.05 to 1000 μm, a density of 1.2 to 2.3 g/cm³ and a fluorine content of 65 to 76 wt. %.

Claims

1. Flame resistant, thermoplastic moulding compounds containing

A) 40 to 98 parts by weight of an aromatic polycarbonate;

B) 3 to 50 parts by weight of a vinyl copolymer prepared from

B.1) 50 to 98 parts by weight of styrene, α

-methylstyrene, ring-substituted styrenes, C₁ -C₈ alkyl methacrylates, C₁ -C₈ alkyl acrylates or mixtures thereof and

B.2) 50 to 2 parts by weight of acrylonitrile, methacrylonitrile, C₁ -C₈ alkyl methacrylates, C₁ -C₈ alkyl acrylates, maleic anhydride, N-substituted maleimides and mixtures thereof;

C) 0.5 to 40 parts by weight of a graft polymer prepared from

C.1) 5 to 95 parts by weight of a mixture of

C.1.1) 50 to 95 parts by weight of styrene, α

-methylstyrene, halogen or methyl ring-substituted styrene, C₁ -C₈ alkyl methacrylate C₁ -C₈ alkyl acrylate, or mixtures of these compounds and

C.1.2) 5 to 50 parts by weight of acrylonitrile, methacrylonitrile, C₁ -C₈ alkyl methacrylates, C₁ -C₈ alkyl acrylate, maleic anhydride, C₁ -C₄ alkyl or phenyl N-substituted maleimides or mixtures of these compounds on

C.2) 5 to 95 parts by weight of a polymer with a glass transition temperature of below -10°

C.

D) 0.5 to 20 parts by weight of a mixture of

D.1) 14 to 40 wt. %, related to D), of a monophosphorus compound of the formula (I) ##STR9## in which R¹, R² and R³ are independently phenyl, cresyl, cumyl, naphthyl, chlorophenyl, bromophenyl, pentachlorophenyl or pentabromophenyl

n means 1 and

D.2) 86 to 60 wt. %, related to D), of an oligomeric phosphorus compound of the formula (II) ##STR10## in which R⁴, R⁵, R⁶, R⁷ are independently cresyl, phenyl xylenyl , propylphenyl or butylphenyl, or brominated or chlorinated derivatives thereof,

n means 1,

y has an average value of between 1 and 2, and

x means a residue derived from resorcinol or hydroquinone, and

E) 0.05 to 5 parts by weight of a fluorinated polyolefin with an average particle diameter of 0.05 to 1000 μ

m, a density of 1.2 to 2.3 g/cm³ and a fluorine content of 65 to 76 wt. %.

2. Moulding compounds according to claim 1 containing 50 to 95 parts by weight of an aromatic polycarbonate A.

3. Molding compounds as according to claim 1 containing component D) in amounts of monophosphorus compound D.1) and an oligomeric phosphorus compound D.2) in combined amounts effective to improve stress cracking resistance.

4. Flame resistant thermoplastic molding compound according to claim 1 containing additives selected from the group consisting of stabilizers, dyes, pigments, lubricants and mold release agents, fillers and reinforcing materials, nucleating agents and antistatic agents.

5. The flame resistant, thermoplastic molding compound of claim 1, wherein in component D.2. each of R⁴, R⁵, R⁶ and R⁷ are phenyl.

6. A flame resistant thermoplastic molding compound having improved stress resistance, consisting essentially of:

A) 40-98 parts by weight of aromatic polycarbonate;

B) 3-50 parts by weight of styrene/acrylonitrile copolymer;

C) 0.5 to 40 parts by weight of a graft polymer of styrene and acrylonitrile on particulate, crosslinked polybutadiene rubber;

D) 0.5 to 20 parts by weight of a mixture of;

D.1.) 14 to 40%, based on D), of triphenyl phosphate;

D.2.) 86 to 60%, based on D), of m-phenylene-bis(diphenylphosphate); and

E) 0.05 to 5 parts by weight of tetrafluoroethylene polymer.

7. The molding compound of claim 6 containing 50 to 95 parts of A), 5 to 40 parts of B), 2 to 12 parts of C), 2 to 15 parts of D), and 0.1 to 0.5 parts of E).

8. The molding compound of claim 7, containing 67 parts of A), 10 parts of B), 7.5 parts of C), and 3.5 parts of E).

9. Flame resistant, thermoplastic mounding compounds containing

A) 40 to 98 parts by weight of an aromatic polycarbonate;

B) 3 to 50 parts by weight of a vinyl copolymer prepared from

B.1) 50 to 98 parts by weight of styrene, α

-methylstyrene, ring-substituted styrenes, C₁ -C₈ alkyl methacrylates, C₁ -C₈ alkyl acrylates or mixtures thereof and

B.2) 50 to 2 parts by weight of acrylonitrile, methacrylonitrile, C₁ -C₈ alkyl methacrylates, C₁ -C₈ alkyl acrylates, maleic anhydride, N-substituted maleimides and mixtures thereof;

C) 0.5 to 40 parts by weight of a graft polymer prepared from

C.1) 5 to 95 parts by weight of a mixture of

C.1.1.) 50 to 95 parts by weight of styrene, α

-methylstyrene, halogen or methyl ring-substituted styrene, C₁ -C₈ alkyl methacrylate C₁ -C₈ alkyl acrylate, or mixtures of these compounds and

C.1.2.) 5 to 50 parts by weight of acrylonitrile, methacrylonitrile, C₁ -C₈ alkyl methacrylates C₁ -C₈ alkyl acrylate, maleic anhydride, C₁ -C₄ alkyl or phenyl N-substituted maleimides or mixtures of these compounds on

C.2) 5 to 95 parts by weight of a polymer with a glass transition temperature of below -10°

C.

D) 0.5 to 20 parts by weight of a mixture of

D.1) 10 to 90 wt. %, related to D), of a monophosphorus compound of the formula (I) ##STR11## in which R¹, R² and R³ mutually independently mean optionally halogenated C₁ -C₈ alkyl, C₆ -C₂₀ aryl or C₇ -C₁₂ aralkyl

n means 1 and

D.2) 90 to 10 wt. %, related to D), of an oligomeric phosphorus compound of the formula (II) ##STR12## in which R⁴, R⁵, R⁶, R⁷ are mutually independently cresyl, phenyl, xylenyl, propylphenyl or butylphenyl, or brominated or chlorinated derivatives thereof

n means 1,

Y means an average value between 1 and 2, and

X means a residue derived from resorcinol or hydroquinone,

and

E) 0.05 to 5 parts by weight of a fluorinated polyolefin with an average particle diameter of 0.05 to 1000 μ

m, a density of 1.2 to 2.3 g/cm³ and a fluorine content of 65 to 76 wt. %.

10. The moulding compound of claim 9, wherein component C) is one or more of polybutadiene, butadiene styrene copolymer, acrylate rubber, polyisobutadiene, or polyisoprene.

11. The moulding composition of claim 9, wherein component C) is polybutadiene, butadiene/styrene copolymer, or mixtures thereof.