Claims
- 1) A process for stabilizing organic acid anhydrides against color changes which comprises the steps of:
a) providing an organic acid anhydride; b) contacting said anhydride with an acid halide of a carboxylic acid; and c) contacting said anhydride with a derivative of a hydroxy carboxylic acid.
- 2) The process according to claim 1 wherein said anhydride is maleic acid anhydride.
- 3) The process according to claim 1 wherein the acid halide is selected from the group consisting of formyl chloride, acetyl chloride, phthaloyl chloride, succinyl chloride, and maleyl chloride.
- 4) The process according to claim 1 wherein said derivative of a hydroxy carboxylic acid comprises at least one of:
- 5) The process of claim 1 in which said derivative of a hydroxy carboxylic acid is a derivative of a hydroxy carboxylic acid which is non-aromatic in character.
- 6) The process of claim 1 in which said derivative of a hydroxy carboxylic acid is a derivative of a hydroxy carboxylic acid selected from the group consisting of: gluconic, glucoheptonic, hydroxyacetic, hydroxyproprionic, and hydroxybutyric acids.
- 7) A process for stabilizing organic acid anhydrides against color changes which comprises the steps of:
a) providing an organic acid anhydride in the liquid state; b) causing an acid halide of a carboxylic acid to exist within said anhydride in the liquid state to form a first mixture; c) causing at least one derivative of a hydroxy carboxylic acid to exist within said first mixture so as to form a final mixture; and d) effecting agitation sufficient to render said final mixture at least reasonably homogeneous.
- 8) A process according to claim 7 further comprising the step of:
e) maintaining said organic acid anhydride in its liquid state.
- 9) A process according to claim 7 further comprising the step of:
e) causing said organic acid anhydride to undergo a phase change from the liquid state to the solid state.
- 10) A process according to claim 9 further comprising the step of:
f) causing said organic anhydride to undergo a subsequent phase change from the solid state to the liquid state.
Parent Case Info
[0001] This Application is a divisional Application of U.S. application Ser. No. 09/480,836 and further claims the benefit of U.S. Provisional Application No. 60/115,770 filed 01/13/99, which is currently still pending.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60115770 |
Jan 1999 |
US |
Divisions (1)
|
Number |
Date |
Country |
Parent |
09480836 |
Jan 2000 |
US |
Child |
10223990 |
Aug 2002 |
US |