Claims
- 1. A process for preparing a light colored foam comprising reacting
- (a) a polyisocyanate which has been produced by
- (1) phosgenating a polyamine which polyamine has been produced by
- (A) reacting (i) aniline with (ii) formaldehyde. in the presence of (iii) an acid catalyst,
- (B) neutralizing the reaction product of (A) with a base, and
- (C) acidifying the product of (B)
- with
- (b) an isocyanate reactive compound in the presence of
- (c) a blowing agent.
- 2. A light colored foam which is prepared by reacting
- (a) an isocyanate-reactive material with
- (b) a polyisocyanate formed by
- (1) phosgenating a polyamine which is produced by
- (A) reacting (i) aniline with (ii) formaldehyde in the presence of (iii) an acid catalyst
- (B) neutralizing the product of (A) with a base, and
- (C) adding an amount of acid to the product of (B) sufficient to make the resultant polyamine acidic.
Parent Case Info
This application is a division of application Ser. No. 07/805,407 filed Dec. 10, 1991 now U.S. Pat. No. 5,386,059.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4465639 |
Hatfield, Jr. |
Aug 1984 |
|
4792624 |
Hatfield, Jr. et al. |
Dec 1988 |
|
5312971 |
Adkins et al. |
May 1994 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
805407 |
Dec 1991 |
|