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    31.
    发明专利
    未知

    公开(公告)号：DK295077A

    公开(公告)日：1978-01-03

    申请号：DK295077

    申请日：1977-07-01

    Applicant: HOECHST AG

    Inventor： GUENTHER D ,  SCHINZEL E ,  ERCKEL R ,  ROESCH G

    IPC: C09K3/00 ,  C09B57/00 ,  D06L3/12 ,  D06L

    Abstract: Mixtures of optical brighteners containing 0.05 to 1% of a 4-benzoxazolystilbene derivative and 1 to 0.05% of a 1,4-bis-benzoxazolyl- or bis-benzthiazolyl-naphthalene derivative. These mixtures show a higher degree of whiteness than an equal amount of only one of the two components.

    35.
    发明专利
    未知

    公开(公告)号：FI48589B

    公开(公告)日：1974-07-31

    申请号：FI19770

    申请日：1970-01-23

    Applicant: HOECHST AG

    Inventor： ROESCH G ,  LINKE W ,  SMERZ O ,  SCHINZEL E

    IPC: C07D231/06 ,  D06L3/12 ,  C09B57/00 ,  D06M13/35 ,  C07D49/10

    Abstract: 1288545 Optical brightening FARBWERKE HOECHST AG 29 Jan 1970 [30 Jan 1969] 4340/70 Heading DIP Fibrous materials of polymers comprising at least 85% of polyacrylonitrile are optically brightened by impregnating the material with a liquor containing a brightener of general formula in which A represents a branched or unbranched C 2-4 alkylene group, R 1 represents a C 1-4 alkyl group, R 2 represents a C 1-4 alkyl group or the two radicals R 2 together with the nitrogen atom form a saturated heterocyclic ring, X represents a colourless anion and n is 1 or 2, adjusting the liquor content of the material to 5-120% by weight referred to the material and heating, preferably with steam, for 2 seconds to 30 minutes at 100‹-150‹C. If the brightened fabric is to be printed immediately it is preferably subjected to intermediate drying at 50‹-150‹C. Thickeners, for example, starch ether, tragacanth, carob bean flour and crystal gum, are added to prevent migration of the optical brightener during drying. Enhanced brightening is achieved when a non-ionic condensation product of a fatty acid and oxyethylated ammonia and/or a quaternary condensation product of a fatty acid and a low molecular weight aliphatic polyamine is added to the brightening liquor. A second brightener of general formula in which A, R 1 , R 2 , X and n have the meanings specified above, shows a greenish-blue fluorescence and is able when applied in admixture with the compounds of formula II, to compensate the reddish tint of the latter.

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