Appeal No. 2001-1375
Application 09/204,609
BACKGROUND
The invention relates to a two-step method for preparing a
cellulose carbamate solution having a high cellulose carbamate
content, low sodium hydroxide content and a low undissolved
cellulose carbamate particle content. Appeal Brief, Paper No.
11, received February 2, 2000, Summary Of Invention, pages 2-3.
In the first step of the process, a cellulose carbamate solution
having 8-15 weight percent cellulose carbamate and 7-12 weight
percent sodium hydroxide is prepared. Id., page 3. In the
second step, dilute sodium hydroxide solution and/or water, is
added to the first solution to produce a second solution having a
sodium hydroxide concentration which is less than the sodium
hydroxide concentration of the first solution and less than 9%.
Id. The claims further require that the weight ratio of
cellulose carbamate to sodium hydroxide in both solutions is
greater then one. Id.
Cellulose carbamate solutions made in accordance with the
method of the invention are utilized in spinning processes for
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