摘要:
The invention relates to a composition suitable for surface treatment of paper, wherein the composition contains a specified fluorescent whitening agent with alkylsulfonic acid groups, a salt of a bivalent cation, and a carrier. The composition is used for whitening paper, in particular in the size press.
摘要:
The invention relates to compounds of formula (I) wherein R1, R2, R3 and R4 independently represent OR3 or NR6R7; R5, R6 and R7 independently represent hydrogen, substituted or unsubstituted alkyl, especially C1-C4 alkyl, or substituted or unsubstituted aryl, especially C6-C10 aryl; R6, R7 can also form an aliphatic or aromatic ring, together with the N atom to which they are bonded and optionally other heteroatoms; M represents hydrogen, an equivalent of a monovalent or bivalent metal ion, especially from the group of alkali metals or alkaline earth metals, or of an optionally organically substituted ammonium ion; and B1 represents a bivalent binding link.
摘要:
The use of optical brighteners of the formula (II): in which Y denotes a radical of the formula and the other substituents have the meaning stated in the description, for brightening aqueous coating slips comprising at least one latex binder and at least one synthetic co-binder differing therefrom.
摘要:
The present invention relates to polymers whitened with optical brighteners obtained by (a) emulsion polymerization of acrylonitrile with or without a comonomer in the presence or absence of a graftable substrate, and (b) addition of an optical brightener before, during, or after the emulsion polymerization.
摘要:
The invention relates to a composition suitable for optically whitening paper or board, wherein the composition contains specified bis-triazinylamino-stilbene fluorescent whitening agents with carboxylic acid and/or sulfonic acid groups. The composition can be used for whitening paper in the pulp, size press or by coating.
摘要:
A composition suitable for paper brightening, wherein the composition contains one or more specified fluorescent whitening agents with taurine groups. The composition is used for whitening paper, in particular at the wet-end, in the size press or by coating.
摘要:
Disulfo-type fluorescent whitening agents for optically brightening coating slips contain a synthetic binder and a different synthetic co-binder. In addition, a coating slip and its use for preparing coated papers are disclosed.
摘要:
The invention relates to a composition suitable for paper brightening, wherein the composition contains one or more specified fluorescent whitening agents with taurine groups. The composition is used for whitening paper, in particular at the wet-end, in the size press or by coating.
摘要:
Process for whitening paper in the size press, characterized in that the size press liquor contains a whitener of the formula I in which X, independently of one another, denote a radical of the formula and R1 represents C1-C6-alkyl and R2 represents H, or R1 represents H and R2 represents C1-C6-alkyl, and, independently thereof, R3 represents H, methyl, ethyl, CH2CH2OH or CH2CH2OCH3, R1′ represents C1-C6-alkyl and R2′ represents H, or R1′ represents H and R2′ represents C1-C6-alkyl, and, independently thereof, R3′ represents H, methyl, ethyl, CH2CH2OH or CH2CH2OCH3 and R4 represents C1-C4-alkyl and M denotes H, one equivalent of an inorganic cation, in particular Li, Na, K, Ca, Mg or ammonium, or a substituted ammonium of the formula II in which R5 to R7, independently of one another, denote hydrogen, a C1-C4-alkyl radical or an optionally further substituted C2-C4-hydroxyalkyl radical, and R8 denotes an optionally further substituted C2-C4-hydroxyalkyl radical, at least 10 mol % of all cations M corresponding to the formula II.
摘要:
Fluorescent whitening agent compositions include at least two specific disulfo-type fluorescent whitening agents for optically whitening paper or board.