GB889720A - Improvements in or relating to the manufacture of polymeric materials - Google Patents

Abstract

A process for the manufacture of polymeric materials by interacting an organic polyisocyanate with a hydroxyl group-containing material such as a polyether, polyester or polyesteramide is characterized in that there are incorporated in the reaction mixture an oxide or sulphide of antimony, bismuth or arsenic and an organic halogen compound which, in addition to carbon, hydrogen and halogen atoms, may optionally contain oxygen, nitrogen or sulphur atoms in the molecule but no other atoms. Specified halogen compounds are ethyl iodide, ethyl bromide, benzotrichloride, bromoform, benzyl bromide, 2:3-dibromopropanol, chloral hydrate and 4-chloro-2-amino-toluene hydrochloride. Fluorine compounds are also mentioned. Usually 5 to 30% of the specified oxides (based on the weight of hydroxy-containing polymer), and an equal proportion of the halogen compound are used. There are listed polyethers (with which glycidol, glycerol, trimethylolpropanes and 3-hydroxymethyl oxacyclobutanes may be copolymerized), polyisocyanates and reactants from which the polyesters and polyesteramides can be prepared. In Example (1) a mixture of a hydroxy-polyester from pentaerythritol, 1:3-butylene glycol, adipic acid and phthalic anhydride, with water, an octylcresolethylene oxide condensation product, 2:3-dibromopropanol and antimony oxide is reacted with diphenyl methane diisocyanate (containing some triisocyanate) to give a foamed product. Other examples employ polyesters from castor oil and citric acid and hexanetriol, adipic acid and phthalic anhydride; N:N-dimethyl benzylamine lactate as catalyst. Specification 733,624 is referred to.ALSO:A process for the manufacture of foamed polymeric materials by interacting an organic polyisocyanate with a hydroxyl group containing material such as a polyether, polyester or polyesteramide is characterised in that there are incorporated in the reaction mixture an oxide or sulphide of antimony, bismuth or arsenic and an organic halogen compound which in addition to carbon, hydrogen and halogen atoms, may optionally contain oxygen, nitrogen or sulphur atoms in the molecule but no other atoms. Specified halogen compounds are ethyl iodide, ethyl bromide, benzotrichloride, bromoform, benzyl bromide, 2 : 3-dibromoproponol, chloral hydrate and 4-chloro-2-amino-toluene hydrochloride. Fluorine compounds are also mentioned. Usually 5 to 30% of the specified oxides (based on the weight of hydroxy-containing polymer) and an equal proportion of the halogen compound are used. Listed are polyethers (with which glycidol, glycerol, trimethylolpropanes and 3-hydroxymethyl oxacyclobutanes may be copolymerised), polyisocyanates, and reactants from which the polyesters and polyesteramides can be prepared. In Example 11 a mixture of a hydroxypolyester from pentaerythritol, 1 : 3-butylene glycol, adipic acid and phthalic anhydride, with water, an octyl cresol-ethylene oxide condensation product, 2 : 3-dibromopropanol and antimony oxide is reacted with diphenyl methane diisocyanate (containing some triisocyanate) to give a foamed product. Other examples employ polyesters from castor oil and citric acid and hexanetriol, adipic acid and phthalic anhydride; and N : N-dimethyl benzylamine lactate as catalyst. Specification 733,624 is referred to.