Claims
- 1. A method for preparing a peroxide-terminated polycarbonate which comprises reacting an organic dihydroxy compound with phosgene in the presence of a peroxy ester of the formula ##STR4## as a chain termination agent, wherein R.sup.1 is a divalent aliphatic or alicyclic radical and R.sup.2 is a tertiary aliphatic or alicyclic radical.
- 2. A method according to claim 1 wherein the dihydroxy compound is a dihydroxyaromatic compound having the formula
- HO-A.sup.2 -Y-A.sup.3 -OH,
- wherein each of A.sup.2 and A.sup.3 is a monocyclic divalent aromatic radical and Y is a bridging radical in which one or two atoms separate A.sup.2 from A.sup.3.
- 3. A method according to claim 2 wherein R.sup.1 is
- --CH.sub.2 CH.sub.2 -- or --CH.dbd.CH--
- 4. A method according to claim 3 wherein R.sup.1 is --CH.dbd.CH-- and R.sup.2 is t-butyl.
- 5. A method according to claim 4 wherein each of A.sup.2 and A.sup.3 is p-phenylene and Y is isopropylidene.
- 6. A method according to claim 2 wherein the reacting is conducted in one step
- 7. A method according to claim 2 wherein the reacting is conducted in two steps, the first being the preparation of a bischloroformate oligomer composition and the second being the conversion of said bischloroformate oligomer composition to a polycarbonate.
Parent Case Info
This application is a division of copending application Ser. No. 07/615,192, filed Nov. 19, 1990, which in turn is a division of Ser. No. 07/404,287, filed Sep. 7, 1989, both now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4304882 |
D'Angelo et al. |
Dec 1981 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
59-27908 |
Feb 1984 |
JPX |
Divisions (2)
|
Number |
Date |
Country |
Parent |
615192 |
Nov 1990 |
|
Parent |
404287 |
Sep 1989 |
|