Polyphosphazene and molding compound containing the polyphosphazene

Patent metadata

Field	Value
Publication number	US-12552904-B2
Application number	US-202017637838-A
Country	US
Kind code	B2
Filing date	Aug 27, 2020
Priority date	Sep 4, 2019
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

The invention relates to a polyphosphazene produced by a method comprising the steps a) and b): a) converting an in particular cyclical phosphazene by means of phenol in the presence of a base; b) further converting by means of a special aromatic diphenol in the presence of a base, wherein the molar ratio of phenol used to cyclical phosphazene used is in the range from 3.5:1 to 1:1. The invention also relates to a method for producing the polyphosphazene and to a molding compound containing the polyphosphazene and a thermoplastic polymer.

First claim

The invention claimed is:

1 . A polyphosphazene produced by a process comprising the steps a) and b):
a) reaction of a cyclic phosphazene of formula (1)

wherein k is a natural number between 1 and 10 with phenol in the presence of a base; and
b) further reaction with an aromatic diphenol of formula (2)

wherein
R 1 and R 2 independently of one another represent H or C 1 - to C 8 -alkyl and
X represents a single bond, C 1 - to C 5 -alkylene, C 2 - to C 5 -alkylidene, C 5 - to C 6 -cycloalkylidene, —O—, —SO—, —CO—, —S—, or —SO 2 —
in the presence of a base,
wherein the molar ratio of employed phenol to the employed cyclic phosphazene of formula (1) is in the range from 3.5:1 to 1:1, and wherein the molar ratio of employed phenol to the employed aromatic diphenol of formula (2) is in the range from 3:1 to 1:1.

2 . The polyphosphazene as claimed in claim 1 , characterized in that the phosphazene has a swelling factor

Q
=

a
-
b

b

of 1 to 15 after storage for 3 days in chloroform,
wherein
a is the mass of the swollen polyphosphazene and
b is the mass of the unswollen polyphosphazene.

3 . The polyphosphazene as claimed claim 1 , characterized in that the base employed in steps a) and b) is selected from 1,8-diazabicyclo[5.4.0]undec-7-ene, N,N-diethylethanamine, and 1,5,7-triazabicyclo[4.4.0]dec-5-ene.

4 . The polyphosphazene as claimed in claim 1 , characterized in that the polyphosphazene has a glass transition temperature determined by differential scanning calorimetry of 70° C. to 150° C.

5 . The polyphosphazene as claimed in claim 1 , characterized in that the employed cyclic phosphazene of formula (1) is a compound having a trimer proportion (k=1) of 60 to 100 mol % based on the cyclic phosphazene of formula (1).

6 . The polyphosphazene as claimed in claim 1 , characterized in that 2,2-bis(4-hydroxyphenyl) propane is used as the aromatic diphenol according to formula (2).

7 . A molding compound containing a thermoplastic polymer and a polyphosphazene as claimed in claim 1 .

8 . The molding compound as claimed in claim 7 , characterized in that the thermoplastic polymer is a polyester, polycarbonate, vinyl (co) polymer, polyamide or mixtures thereof.

9 . The molding compound as claimed in claim 7 , characterized in that the polyphosphazene is present in a proportion of 2% to 20% by weight.

10 . A molded article containing a molding compound as claimed in claim 7 .

11 . The polyphosphazene as claimed in claim 1 , characterized in that in step a) the base is added in a molar ratio of 0.8:1 to 1.2:1 based on phenol and in step b) in a molar ratio of 0.8:1 to 1.2:1 based on the OH groups of the diphenol.

12 . The polyphosphazene as claimed in claim 1 , wherein the molar ratio of employed phenol to the employed aromatic diphenol of formula (2) is in the range from 3:1 to 1.2:1.

13 . The polyphosphazene as claimed in claim 1 , wherein the molar ratio of employed phenol to the employed aromatic diphenol of formula (2) is in the range from 2:1 to 1.2:1.

Assignees

• Covestro Intellectual Property Gmbh & Co Kg
• Covestro Deutschland Ag

Inventors

• Paven Maxime
• Taschner Vera
• Hobeika Sven
• Eckel Thomas
• Mentizi Stamo
• Pochorovski Igor
• Pich Andrij
• Deniz Ayse
• Buschmann Sven

Classifications

• C08L69/00

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title

• C08G79/025 Primary

  Polyphosphazenes · CPC title

• C07F9/65812 Primary

  Cyclic phosphazenes [P=N-]n, n>=3 · CPC title