FIRE RETARDANT AND METHOD OF RECEPTION THEREOF Russian patent published in 2009 - IPC C07F9/40 C09K21/12 

FIELD: chemistry.

SUBSTANCE: invention refers to fire retardants based on pentaerythrite and methylphosphoric acid esters including that oxypropylated which can be used as the additive in composite polymeric materials for combustibility decrease. Offered fire retardants are characterised by production methods and physical and chemical properties. Fire retardants production methods include interaction of methylphosphoric acid dichloranhydride and pentaerythrite in certain molar ratio and certain temperature conditions. And for fire retardant production dimethylmethylphosphonate can be used. Resulted from interaction of methylphosphoric acid dichloranhydride and pentaerythrite, fire retardant is viscous water- and alcohol-soluble liquid at 20÷25°C being semicrystalline substance with phosphorus content 14.1÷14.36%, alcohol OH-group content 13.6-14.0 %, acid OH-group content 2.5-3.5 % and pentaerythrite 1.15-1.3 %. Once produced fire retardant is processed with propylene oxide at certain temperature conditions, it is possible to produce fire retardant representing viscous substance with phosphorus content 10.0÷10.3%, alcohol OH-group content 10÷12%, volatile content 1.5-2.0 % and KOH acid value 0.1-0.4 mg per 1 g of product.

EFFECT: production of new effective polymer-honeycomb additives and combustibility decreasing composite materials.

2 cl, 4 ex, 1 tbl