American Cyanamid Company

Albrecht H Granzow

Christos Savides

Erwin Klingsberg

Nigrosine base (Color Index 50,415:1) which is pyrophoric is made non-pyrophoric by sparging a solution thereof in aniline with air.

Non-pyrophoric nigrosine base

Flame retardant compositions are prepared from rubber-modified polyphenylene ether resins and a phosphinic acid of the formula ##STR1## wherein R is aryl, alkyl, cycloalkyl and beta-cyano-substituted alkyl, and R' is hydrogen or the same groups as R.

Phosphinic acid flame retardants for polyphenylene ether resins

Flame retardant polyphenylene ether resins are prepared using phosphine oxides of the formula: ##STR1## wherein Y is alkylene, substituted xylylene, bis(methylene)anthrylene, and bis(methylene)tetrahydronaphthalene.

Flame retarded, rubber-modified, polyphenylene ether resin compositions

Flame retardant, rubber-modified polyphenylene ether resin compositions are prepared using a phosphine oxide of the formula ##STR1## wherein R is cycloalkyl, phenyl, carbamoylethyl or carboalkoxyethyl; and Y is alkylene, substituted xylylene, and bis-(methyl)terephthalate.

Bis phosphine oxide flame retarded, rubber-modified, polyphenylene ether

Flame retardant compositions are prepared from rubber-modified polyphenylene ether resins and a phosphine oxide of the formula ##STR1## wherein R is alkyl, cycloalkyl, carboxyalkyl, phenyl, halophenyl, and alkoxyphenyl, and R' is hydrogen, alkyl, omega-cyanoalkyl, benzyl, alkylbenzyl and hydroxyalkyl.

Phosphine oxide flame retarded, rubber-modified, polyphenylene ether

Flame retardant poly(butylene terephthalate) compositions are prepared by incorporating into the polymer a combination of a polymeric pentaerythrityl phosphonate and melamine pyrophosphate.

Flame retardant poly(butylene terephthalate) composition

Polyphenylene ether resin compositions are flame retarded by using specified phosphine oxides of the formula

Flame retardant poly(butyleneterephthalate) composiitions are prepared by incorporating into the polymer a combination of a pentaerythrityl phosphonate and melamine pyrophosphate.

Flame retardant poly(butylene terephthalate) compositions comprising

Polyphenylene ether resin compositions are flame retarded by using a combination of a phosphine oxide and a phosphonate in a weight ratio of about 1:3 to 3:1.

Synergistic flame retardant compositions for polyphenylene ether resins

Flame retardant compositions are prepared from rubber modified polyphenylene ether resins and phosphine oxide compounds containing at least two 2-cyanoethyl groups.

Flame retardants containing two or more 2-cyanoethyl groups for

Flame retardant rubber-modified polyphenylene-ether resins compositions having improved thermal stability are prepared by using a 2,5,5-trisubstituted 1,3,2-dioxaphosphorinane-2-oxide of the formula: ##STR1##

Flame-retardant, polyphenylene-ether resin compositions containing a

Polyphenylene ether resin/rubber-modified, high-impact polystyrene thermoplastic compositions as rendered flame retardant by use of specific pentaerythrityl phosphonate compounds.

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Somerset, NJ, United States of America

Albrecht H Granzow