Henry Lydell Braxton

US Patent:

39963128, Dec 7, 1976

Filed:

Nov 21, 1974

Appl. No.:

5/525932

Inventors:

Charles H. Kolich - Northville MI
Henry G. Braxton - Franklin MI
Urho A. Lehikoinen - Detroit MI

Assignee:

Ethyl Corporation - Richmond VA

International Classification:

C07C 906
C08K 553

US Classification:

260927N

Abstract:

The fire retardancy of polyesters is enhanced with halophenoxyphosphazenes that contain a P--O--P bond. Preferred materials are reaction products of a halogenated phenol and a phosphonitrilic halide. Brominated phenols are preferred although chlorophenols can be used. Of the brominated phenols, preferred starting materials are p-bromophenol, 2,4-dibromophenol and mixtures thereof. Phosphonitrilic chlorides are preferred starting materials. Pure phosphonitrilic halides can be used; however, phosphonitrilic halide mixtures are preferred because of their availability. Cyclic and linear phosphonitrilic halides are useful as well as mixtures thereof. Saturated and unsaturated polyesters can be made fire retardant by this invention, as can thermoplastic and thermosetting materials. Linear and crosslinked polyesters can be treated. Preferred polyesters are fiber-forming polyesters of a diol and dibasic acid, such as poly(ethylene terephthalate) and poly(1,4-cyclohexylenedimethyleneterephthalate).

US Patent:

40269647, May 31, 1977

Filed:

Sep 15, 1976

Appl. No.:

5/723552

Inventors:

Charles H. Kolich - Northville MI
Henry G. Braxton - Franklin MI
Urho A. Lehikoinen - Detroit MI

Assignee:

Ethyl Corporation - Richmond VA

International Classification:

C07D 906
C08K 553
C08L 3106

US Classification:

260860

Abstract:

The fire retardancy of polyesters is enhanced with halophenoxyphosphazenes that contain a P--O--P bond. Preferred materials are reaction products of a halogenated phenol and a phosphonitrilic halide. Brominated phenols are preferred although chlorophenols can be used. Of the brominated phenols, preferred starting materials are p-bromophenol, 2,4-dibromophenol and mixtures thereof. Phosphonitrilic chlorides are preferred starting materials. Pure phosphonitrilic halides can be used; however, phosphonitrilic halide mixtures are preferred because of their availability. Cyclic and linear phosphonitrilic halides are useful as well as mixtures thereof. Saturated and unsaturated polyesters can be made fire retardant by this invention, as can thermoplastic and thermosetting materials. Linear and crosslinked polyesters can be treated. Preferred polyesters are fiber-forming polyesters of a diol and dibasic acid, such as poly(ethylene terephthalate) and poly(1,4-cyclohexylenedimethyleneterephthalate).