Marubishi Yuka Kogyo Kabushiki Kaisha

Mitsubishi Petrochemical Company Limited

Takeshi Kasahara

Haruhiko Hisada

Yoshikatsu Ogawa

Fumihiko Kizaki

Masahide Yoshiya

Takayoshi Kojima

A process for the preparation of a dibromopropyl ether compound having a high melting point, which comprises mixing a bis-dibromopropyl ether of tetrabromobisphenol-sulfone or tetrabromobisphenolpropane represented by the following general formula: ##STR1## in the melted state with a crystallized product of said compound at a temperature lower than the melting point of the crystallized product, and holding the mixture at a temperature of 50.degree. to 100.degree. C. According to this process, the dibromopropyl ether compound of a high melting point can be prepared without using an organic solvent.

Process for preparation of dibromopropyl ether compound having high

Bis-(4-hydroxy-3,5-dibromophenyl) sulfone is converted to an allyl ether in the presence of an alkali with allyl chloride in the presence of a bromide and/or an iodide, and/or a substance capable of forming a bromide and/or an iodide by reaction with the alkali.

Process for preparing bis-(4-hydroxy-3,5-dibromophenyl)-sulfone

A flame retardant for polyolefins, which comprises as an effective ingredient a hardly water-soluble or water-insoluble, nitrogen-containing phosphorus compound obtained by mixing 100 parts by weight of a condensed phosphoric acid compound with 10 to 100 parts by weight of a triazine compound and heating the mixture at 100.degree. to 250.degree. C. in the presence or absence of water.

Flame retardants for polyolefins

Highly durable flame-retardant thermoplastic polymer compositions contain thermoplastic polymer consisting of an ethylenically unsaturated monomer and from 0.1 to 20%, based on the weight of the thermoplastic polymer, of specific brominated alkoxydiphenyl sulfone derivative of the formula: ##STR1## WHEREIN A is a member selected from the group consisting of a hydrogen atom and allyl, propyl and 2,3-dihalogenopropyl groups, and X.sub.1, X.sub.2, X.sub.3 and X.sub.4 are members selected from the group consisting of chlorine and bromine atoms with at least two of them being bromine atoms.

Flame-retardant thermoplastic polymer compositions

Highly durable flame-retardant polyurethanes can be produced by the process wherein 3 mols of dibromoneopentyl glycol is reacted with 0.5 to 4 mols of phosphoric anhydride, the ester thus obtained is reacted with at least one member selected from the group consisting of alkylene oxides and haloalkylene oxides and then, the phosphorus compound thus obtained, as a portion of a polyhydroxyl component, is incorporated with another polyhydroxyl compound and reacted with a polyisocyanate component in the presence of a catalyst.

Growing community of inventors

Sakai, Japan

Takeshi Kasahara