Patent ID: 6599326
Filing Date: 2003-07-29
Classification: D21C,D21H

Abstract:
A composition having reduced loss of brightness and enhanced resistance to yellowing which comprises(a) a chemical paper which may still contain traces of lignin, and (b) an amount which is effective to reduce loss of brightness and enhance resistance to yellowing of an N,N-dialkylhydroxylamine, an ester, amide or thio substituted N,N-dialkylhydroxylamine or N,N-dibenzylhydroxylamine of formula I, II or III R1R2Nâ€”OHâ€ƒâ€ƒ(I) (T1SCH2)(T2SCH2)Nâ€”OHâ€ƒâ€ƒ(II) (E1COCH2CH2)(E2COCH2CH2)Nâ€”OHâ€ƒâ€ƒ(III) whereR1 and R2 are independently alkyl of 1 to 18 carbon atoms, alkyl of 1 to 18 carbon atoms substituted by a hydroxyl group; or benzyl; T1 and T2 are independently alkyl of 1 to 4 carbon atoms, phenyl, 3,5-di-tert-butyl-4-hydroxy-phenyl, benzyl or â€”CH2COOH; E1 and E2 are independently â€”OE3, â€”NHE3 or â€”NE3E4 where E3 and E4 are independently hydrogen, alkyl of 1 to 4 carbon atoms or said alkyl substituted by one hydroxyl group; or of an acid salt of formula IA, IIA or IIIA(R1R2NHâ€”OH)h+(Xâˆ’)jâ€ƒâ€ƒ(IA) [(T1SCH2)(T2SCH2)NHâ€”OH]h+(X31 )jâ€ƒâ€ƒ(IIA) [(E1COCH2CH2)(E2COCH2CH2)NHâ€”OH]h+(Xâˆ’)jâ€ƒâ€ƒ(IIIA) whereR1, R2, T1, T2, E1 and E2 are as defined above, X is an inorganic or organic anion, and the total charge of cations h is equal to the total charge of anions j.