Reinforced flame retardant polyester composition having non-drip characteristics

A process for preparing a reinforced flame retardant copolyester molding resin composition having non-drip characteristics comprising intimately mixing in the absence of asbestos

• A. from about 20 to about 50% by weight of at least one reinforcing agent
• B. from about 2 to about 7% by weight of at least one Group Vb metal-containing compound, and
• C. the molten reaction product of
• 1. from about 40 to about 75% by weight of a copolyester of
• a. at least one alkane diol having 3 or 4 carbon atoms selected from the group consisting of 1,3-propane diol and 1,4-butane diol,
• b. terephthalic acid, isophthalic acid, or a dialkyl ester thereof wherein the alkyl radical contains from 1 to 7 carbon atoms, and
• c. a halogenated derivative of the bishydroxyethylether of p,p'-isopropylidenediphenol, having the formula ##STR8## wherein the X' s represent bromine and/or chlorine atoms and the halogenated derivative of the bishydroxyethylether of p,p'-isopropylidenediphenol comprises from about 10 to about 30% by weight of the copolyester composition, and
• 2. from about .35 to about 4% by weight of at least one polycarbodiimide, which polycarbodiimide both
• a. is derived from at least one aromatic diisocyanate which is either unsubstituted or contains up to one methyl substituent on each aromatic ring, and
• b. contains at least three carbodiimide units per polycarbodiimide molecule, whereby said resulting reinforced copolyester molding resin composition is flame retardant and exhibits non-drip characteristics.

A process for preparing a reinforced flame retardant copolyester molding resin composition having non-drip characteristics consisting essentially of intimately mixing in the absence of asbestos

• A. from about 25 to about 45% by weight of at least one reinforcing agent selected from the group consisting essentially of glass fibers, graphite fibers, acicular calcium metasilicate and mixtures thereof,
• B. from about 3 to about 6% by weight of at least one Group Vb metal-containing compound, and
• C. the molten reaction product of
• 1. from about 50 to about 70% by weight of a copolyester of
• a. 1,4-butane diol,
• b. dimethyl terephthalate, and
• c. 2,2-bis[3,5-dibromo-4-(2-hydroxyethyl) phenyl] propane, and
• 2. from about 45 to about 3% by weight of a polycarbodiimide selected from the group consisting of poly (tolyl carbodiimide), poly (4,4'-diphenylmethane carbodiimide), poly (3,3'-dimethyl 4,4'-biphenylene carbodiimide), poly (p-phenylene carbodiimide), poly (m-phenylene carbodiimide), poly (3,3'-dimethyl-4,4'-diphenylmethane carbodiimide), and mixtures thereof said reaction being conducted at a temperature of from about 230.degree. to about 260.degree. C and at substantially atmospheric pressure whereby said resulting reinforced copolyester molding resin composition is flame retardant and exhibits non-drip characteristics.

A reinforced flame retardant copolyester molding resin compound having non-drip characteristics comprising an intimte blend of

• A. at least one reinforcing agent
• B. at least one Group Vb metal-containing compound, and
• C. the reaction product of
• 1. a copolyester of
• a. at least one alkane diol having from two to six carbon atoms selected from the group consisting of ethylene glycol, 1,3-propane diol, 1,4-butane diol, 1,5-pentane diol, and 1,6-hexane diol,
• b. terephthalic acid, isophthalic acid, or a dialkyl ester thereof wherein the alkyl radical contains from 1 to 7 carbon atoms, and
• c. a halogenated derivative of the bishydroxyethylether of p,p'-isopropylidenediphenol, having the formula ##STR9## wherein the aromatic nuclei of the p,p'-isopropylidenediphenol are substituted with from one to four halogen atoms, R is a bivalent hydrocarbon radical containing from two to six carbon atoms, m and n are integers from 1 to 10, and the halogenated derivative of the bishydroxyethylether of p,p'-isopropylidenediphenol comprises from about 8 to about 40% by weight of the copolyester composition, and
• 2. at least one polycarbodiimide, which polycarbodiimide both
• a. is derived from at least one aromatic diisocyanate which is either unsubstituted or contains up to one methyl substituent on each aromatic ring, and
• b. contains at least three carbodiimide units per polycarbodiimide molecule, whereby said resulting reinforced copolyester molding resin composition is flane retardant and exhibits non-drip characteristics.

A reinforced flame retardant copolyester molding resin composition consisting of from about 20 to about 50% by weight of at least one reinforcing agent, from about 2 to about 7% by weight of at least one Group Vb metal-containing compound intimately admixed with the reaction product of

• A. from about 40 to about 75% by weight of a copolyester comprising
• 1. at least one alkane diol having 3 or 4 carbon atoms selected from the group consisting of 1,3-propane diol and 1,4-butane diol,
• 2. terephthalic acid, isophthalic acid, or a dialkyl ester thereof wherein the alkyl radical contains from one to seven carbon atoms, and
• 3. a halogenated derivative of bishydroxyethylether of p,p'-isopropylidenediphenol, having the structural formula ##STR10## wherein the X's represent bromine and/or chlorine atoms and the halogenated derivative of the bishydroxyethylether of p,p'-isopropylidenediphenol comprises from about 10 to about 30% by weight of the copolyester composition, and
• B. from about .35 to about 4% by weight of a polycarbodiimide selected from the group consisting of poly (tolyl carbodiimide) poly (4,4'-diphenylmethane carbodiimide), and mixtures thereof.