Flame-retardant for engineering thermoplastic applications
AssigneeBromine Compounds Ltd.
InventorsYoav Bar-Yaakov, Timothy Geran
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Abstract
This invention provides a flame retardant for polymeric compositions which is a mixture consisting of high molecular weight brominated epoxides modified with tribromophenol, having a low content of organic solvents. The invention further relates to a method for the preparation of the retardant, and to its use in flame retarded engineering thermoplastics having good chemical, thermal, and mechanical properties.
Claims18
Flame retardant for polymeric compositions, which comprises a mixture of compounds of formula (I) and/or formula (II) and/or formula (III), wherein at least 80 mol % of the end groups are tribromophenyl-oxo-2-hydroxypropyl groups, and at most 20 mol % of the end groups are glycidyl groups, which composition has high molecular weight, has a free tribromophenol content less than 0.1 wt % of the whole flame retardant, and has a content of organic solvents, with boiling point lower than 250° C., lower than 100 ppm of the whole flame retardant.
Polymeric compositions, comprising a base polymer chosen from among polyethylene terephthalate or polybutylene terephthalate or mixtures thereof, or polyamides or polycarbonate and its alloys, and comprising at least one flame retardant for polymeric compositions, which comprises a mixture of compounds of formula (I) and/or formula (II) and/or formula (III), wherein at least 80 mol % of the end groups are tribromophenyl-oxo-2-hydroxypropyl groups, and at most 20 mol % of the end groups are glycidyl groups, which composition has high molecular weight, has a free tribromophenol content less than 0.1 wt % of the whole flame retardant, and has a content of organic solvents, with boiling point lower than 250° C., lower than 100 ppm of the whole flame retardant.
Method for the preparation of flame retardants for polymeric compositions, which comprises a mixture of compounds of formula (I) and/or formula (II) and/or formula (III), wherein at least 80 mol % of the end groups are tribromophenyl-oxo-2-hydroxypropyl groups, and at most 20 mol % of the end groups are glycidyl groups, which composition has high molecular weight, has a free tribromophenol content less than 0.1 wt % of the whole flame retardant, and has a content of organic solvents, with boiling point lower than 250° C., lower than 100 ppm of the whole flame retardant, which comprises the steps of reacting low molecular weight brominated epoxide (LMW BE), having low volatile content, with tetrabromobisphenol-A (TBBA) and tribromophenol (TBP) in the presence of a catalyst.
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Dependencies are inferred from the claim text.