Claims
- 1. A flame retardant thermoplastic molding composition having improved physical properties, the composition consisting essentially of an intimate mixture of:
- (a) a high molecular weight poly(1,4-butylene terephthalate) homo- or copolyester resin;
- (b) (i) a copolymer comprised of ethylene and vinyl acetate in combination with an aromatic polycarbonate derived from bisphenol A; or (ii) a mixture of a reinforcing amount of glass fibers and a copolymer comprised of ethylene and vinyl acetate in combination with an aromatic polycarbonate derived from bisphenol-A;
- (c) a flame retardant amount of a flame retardant additive; and
- (d) a mineral filler selected from the group consisting of silica, mica, talc, pysophillite, wollastonite and mineral wool, and mixtures of any of the foregoing; component (d) being present in an amount of from about 5 to about 40% by weight sufficient to provide electrical arc track resistance superior to that of a corresponding composition in which mineral filler component (d) is not present.
- 2. A composition as defined in claim 1 wherein component (a) is linear or branched.
- 3. A composition as defined in claim 1 wherein component (d) comprises from about 10 to 30% by weight.
- 4. A composition as defined in claim 1 wherein component (b) is (b) (i) and (b) (i) contains a copolymer consisting of ethylene and vinyl acetate that contains less than 50% by weight vinyl acetate, the remainder ethylene.
- 5. A composition as defined in claim 1 wherein, component (b) is (b) (i), and (b) (i) said copolymer is a copolymer selected from the group consisting of one derived from ethylene, vinyl acetate and carbon monoxide, ethylene, vinyl acetate and methacrylic acid, and ethylene, vinyl acetate and acrylic acid.
- 6. A composition as defined in claim 1 wherein flame retardant component (c) comprises a halogenated aromatic ether or a halogenated aromatic polycarbonate homo- or copolymer.
- 7. A composition as defined in claim 1, wherein said filler component (d) is silica, talc or mica.
- 8. In a process for the preparation of a flame retardant molding composition having improved physical properties comprising forming an intimate melt-blended admixture consisting essentially of:
- (a) a high molecular weight poly(1,4-butylene terephthalate) homo- or copolyester resin;
- (b) (i) a copolymer comprised of ethylene and vinyl acetate in combination with an aromatic polycarbonate derived from bisphenol-A; or (ii) a reinforcing amount of glass fibers and a copolymer comprised of ethylene and vinyl acetate in combination with an aromatic polycarbonate derived from bisohenol-A and
- (c) a flame retardant amount of a flame retardant additive;
- the improvement comprising the step of including in said intimate admixture
- (d) a mineral filler selected from the group consisting of silica, mica, talc, pyrophillite, wollastonite and mineral wool, and mixtures of any of the foregoing in an amount of from about 5 to 40% by weight at least sufficient to provide the composition with electrical arc track resistance superior to that of a corresponding composition in which mineral filler component (d) is not present.
- 9. A process as defined in claim 8 wherein component (d) is added in an amount comprising from about 10 to 30% by weight of the total weight of the composition.
- 10. A flame retardant thermoplastic molding composition having improved physical properties, the composition consisting of an intimate admixture of:
- (a) a high molecular weight poly(1,4-butylene terephthalate) homo- or copolyester resin; (b) (i) a copolymer comprised of ethylene and vinyl acetate in combination with an aromatic homopolycarbonate; (ii) a high molecular weight polyethylene terephthalate resin; (iii) a mixture of a reinforcing amount of glass fibers and a copolymer comprised of with an aromatic homopolycarbonate; (iv) a mixture of a reinforcing amount of glass fibers and a high molecular weight polyethylene terephthalate resin, or (v) a mixture of (i), (ii) and a reinforcing amount of glass fibers;
- (c) a flame retardant amount of a flame retardant additive; and
- (d) a mineral filler selected from the group consisting of silica, mica, talc, pyrophillite, wollastonite and mineral wool, and mixtures of the foregoing;
- component (d) being present in an amount of from about 5 to about 40% by weight sufficient to provide electrical arc track resistance superior to that of a corresponding composition in which mineral filler component (d) is not present.
- 11. A flame retardant thermoplastic composition as defined in claim 10 wherein the mineral filler is silica.
- 12. A flame retardant thermoplastic composition as defined in claim 10 wherein the mineral filler is mica.
- 13. A flame retardant thermoplastic composition as defined in claim 10 wherein the mineral filler is talc.
- 14. A flame retardant thermoplastic molding composition as defined in claim 10 wherein the mineral filler is pyrophillite.
- 15. A flame retardant thermoplastic molding composition as defined in claim 10 wherein the mineral filler is wollastonite.
- 16. A flame retardant thermoplastic molding composition as defined in claim 10 wherein the mineral filler is mineral wool.
- 17. A flame retardant thermoplastic molding composition having improved physical properties, the composition consisting of an intimate admixture of:
- (a) a high molecular weight poly(1,4-butylene terephthalate) homo or copolyester resin;
- (b) (i) a copolymer consisting of ethylene and vinyl acetate in combination with an aromatic homopolycarbonate; (ii) a high molecular weight polyethylene terephthalate resin; (iii) a mixture of a reinforcing amount of glass fibers and component (b) (i); (iv) a mixture of a reinforcing amount of amount of glass fibers and component (b) (ii); or (v) a mixture of a reinforcing amount of glass fibers, component (b) (i) and component (b) (ii);
- (c) a flame retardant amount of a flame retardant additive; and
- (d) a mineral filler selected from the group consisting of silica, mica, talc, pyrophillite, wollastonite and mineral wool, and mixtures of the foregoing;
- component (d) being present in an amount of from about 10 to about 30% by weight sufficient to provide electrical arc track resistance superior to that of a corresponding composition in which mineral filler component (d) is not present.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation of application Ser. No. 35,090, filed May 1, 1979, now abandoned.
US Referenced Citations (14)
Foreign Referenced Citations (2)
Number |
Date |
Country |
52-58752 |
May 1977 |
JPX |
754679 |
Jul 1975 |
ZAX |
Continuations (1)
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Number |
Date |
Country |
Parent |
35090 |
May 1979 |
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