Flameproof styrene containing graft resin compositions substantially free of phenolic resins and containing styrene/acrylonitrile resin compatabilizer

A flameproof thermoplastic resin composition comprising:

• (A) about 40-95 parts by weight of a rubber modified styrene-containing resin comprising
• (a1) about 20-95% by weight of a styrene-containing graft copolymer resin containing about 19-50% by weight of acrylonitrile in the copolymer excluding rubber and
• (a2) about 5-80% by weight of a styrene-containing copolymer containing about 19-50% by weight of acrylonitrile;
• (B) about 5-60 parts by weight of a polyphenylene ether resin;
• (C) about 2-40 parts by weight of a compatabilizer comprising
• (c1) a styrene-containing copolymer containing about 5-18% by weight of acrylonitrile in the copolymer per 100 parts by weight of the sum of (A) and (B) or
• (c2) a styrene-containing graft copolymer having up to about 60% by weight of rubber wherein the compatabilizer contains about 5-18% by weight of acrylonitrile in the copolymer excluding rubber, per 100 parts by weight of the sum of (A) and (B);
• and
• (D) about 5-30 parts by weight of an aromatic phosphoric acid ester per 100 parts by weight of the sum of (A) and (B),
• wherein the resin composition contains about 0% by weight of phenolic resin, red phosphorous, and silicone resin based on the total weight of the composition.

A flameproof thermoplastic resin composition substantially free of phenolic resin and red phosphorous comprising:

• (A) about 40-95 parts by weight of a rubber modified styrene-containing resin comprising
• (a1) abut 20-95% by weight of a styrene-containing graft copolymer resin containing about 19-50% by weight of acrylonitrile in the copolymer excluding rubber and
• (a2) about 5-80% by weight of a styrene-containing copolymer containing about 19-50% by weight of acrylonitrile;
• (B) about 5-60 parts by weight of a polyphenylene ether resin;
• (C) about 2-40 parts by weight of a compatabilizer comprising
• (c1) a styrene-containing copolymer containing about 5-18% by weight of acrylonitrile in the copolymer excluding rubber, per 100 parts by weight of the sum of (A) and (B) or
• (c2) a styrene-containing graft copolymer having up to about 60% by weight of rubber wherein the compatabilizer contains about 5-18% by weight of acrylonitrile in the copolymer excluding rubber, per 100 parts by weight of the sum of (A) and (B);
• and
• (D) about 5-30 parts by weight of an aromatic phosphoric acid ester per 100 parts by weight of the sum of (A) and (B),
• wherein the resin composition contains about 0% by weight silicone resin based on the total weight of the composition.

A flameproof thermoplastic resin composition substantially free of phenolic resin and red phosphorous comprising:

• (A) about 40-95 parts by weight of a rubber modified styrene-containing resin comprising
• (a1) about 20-95% by weight of a styrene-containing graft copolymer resin containing about 19-50% by weight of acrylonitrile in the copolymer excluding rubber and
• (a2) about 5-80% by weight of a styrene-containing copolymer containing about 19-50% by weight of acrylonitrile;
• (B) about 5-60 parts by weight of a polyphenylene ether resin;
• (C) about 2-40 parts by weight of a compatabilizer comprising
• (c1) a styrene-containing copolymer containing about 5-18% by weight of acrylonitrile in the copolymer excluding rubber, per 100 parts by weight of the sum of (A) and (B) or
• (c2) a styrene-containing graft copolymer having up to about 60% by weight of rubber wherein the compatabilizer contains about 5-18% by weight of acrylonitrile in the copolymer excluding rubber, per 100 parts by weight of the sum of (A) and (B);
• and
• (D) about 5-30 parts by weight of an aromatic phosphoric acid ester per 100 parts by weight of the sum of (A) and (B),
• wherein the resin composition contains less than 3% by weight of polycarbonate based on the total weight of the composition, wherein the resin composition is produced in a two-step process comprising
• a first step (i) preparing a master batch containing about 40-95 parts by weight of polyphenylene ether (PPE) (B), about 5-60 parts by weight of compatabilizer (C) having about 5-18% by weight of acrylonitrile content, and about 0-30 parts by weight of aromatic phosphoric acid ester compound (D) at about 250-300° C. of molding temperature;
• and
• a subsequent second step (ii) adding a rubber modified styrene-containing resin (A) and aromatic phosphoric acid ester compound (D) to the master batch and extruding the resulting mixture at about 200-260° C.

A method of producing a flameproof thermoplastic resin composition substantially free of phenolic resin and red phosphorous and contains less than 3% by weight of polycarbonate based on the total weight of the composition wherein the resin composition comprises

• (A) about 40-95 parts by weight of a rubber modified styrene-containing resin comprising
• (a1) abut 20-95% by weight of a styrene-containing graft copolymer resin containing about 19-50% by weight of acrylonitrile in the copolymer excluding rubber and
• (a2) about 5-80% by weight of a styrene-containing copolymer containing about 19-50% by weight of acrylonitrile;
• (B) about 5-60 parts by weight of a polyphenylene ether resin;
• (C) about 2-40 parts by weight of a compatabilizer comprising
• (c1) a styrene-containing copolymer containing about 5-18% by weight of acrylonitrile in the copolymer excluding rubber, per 100 parts by weight of the sum of (A) and (B) or
• (c2) a styrene-containing graft copolymer having up to about 60% by weight of rubber wherein the compatabilizer contains about 5-18% by weight of acrylonitrile in the copolymer excluding rubber, per 100 parts by weight of the sum of (A) and (B);
• and
• (D) about 5-30 parts by weight of an aromatic phosphoric acid per 100 parts by weight of the sum of (A) and (B),
• wherein the method is a two-step process comprising
• a first step (i) preparing a master batch containing about 40-95 parts by weight of polyphenylene ether (PPE) (B), about 5-60 parts by weight of compatabilizer (C) and about 0-30 parts by weight of aromatic phosphoric acid ester compound (D) at about 250-300° C. of molding temperature;
• and then
• a subsequent second step (ii) adding a rubber modified styrene-containing resin (A) and aromatic phosphoric acid ester compound (D) to the master batch and extruding the resulting mixture at about 200-260° C.