Appeal No. 2006-2666
Application No. 10/140,531
The present invention relates to a process of preventing the loss of
brightness and for enhancing resistance to yellowing of pulp or paper. According
to Appellants, the pulp or paper compositions have reduced loss of brightness and
enhanced resistance to yellowing by virtue of the composition comprising certain
hindered amine derivatives (Br. 7). Representative claim 44, as presented in
Appellants’ Brief, is reproduced below:
44. A process for preventing the loss of brightness and for enhancing
resistance to yellowing of pulp or paper which comprises
treating said pulp or paper with an effective stabilizing amounts
of hydroxylamine compound of formula I, II or III or hydroxylamine
salt of formula IA, IIA or IIIA
R1R2N-OH (I)
(T1SCH2)(T2SCH2)N-OH (II)
(E1COCH2CH2)(E2COCH2CH2)N-OH (III)
(R1R2NH-OH)h+ (X-)j (IA)
[(T1SCH2)(T2SCH2)NH-OH]h+ (X-)j (IIA)
[(E1COCH2CH2)(E2COCH2CH2)NH-OH]h+ (X-)j (IIIA)
where
R1and R2 are independently alkyl of 1 to 18 carbon atoms, alkyl
of 1 to 18 carbon atoms substituted by a hydroxyl group; or benzyl;
T1and T2 are independently alkyl of 1 to 4 carbon atoms,
phenyl, 3, 5-di-tert-butyl-4-hydroxy-phenyl, benzyl or - CH2COOH;
E1and E2 are independently -OE3, -NHE3 or -NE3E4 where E3
and E4 are independently hydrogen, alkyl of 1 to 4 carbon atoms or
said alkyl substituted by one hydroxyl group;
2
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Last modified: September 9, 2013