23.
    发明专利
    未知

    公开(公告)号:DE19539293A1

    公开(公告)日:1997-04-24

    申请号:DE19539293

    申请日:1995-10-23

    Applicant: BASF AG

    Abstract: Preparation of cyanoacetic acid alkyl esters of formula (I) by reaction of cyanoacetic acid with an alcohol R(OH)n in an aqueous medium is carried out in the presence of an inert solvent, and during the reaction water and solvent are distilled off at atmospheric or reduced pressure. (NC-CH2-COO)nR (I). R = 6-20C aliphatic group, optionally containing 1-3 ether O atoms in the C chain ; and n = 1-6.

    25.
    发明专利
    未知

    公开(公告)号:DE4408199A1

    公开(公告)日:1995-09-14

    申请号:DE4408199

    申请日:1994-03-11

    Applicant: BASF AG

    Abstract: Copolymers of formula (I), based on dicarboxylic acid imides, alkenyl isocyanates and/or alkenyl urethanes are claimed, as are also (i) prepn. of (I) by free radical polymerisation of 30-70 mol.% monomer of formula (III) corresp. to the `b' units and 70-30 mol.% cyclic monomer of formula (IV) corresp to the `c' units, opt. with up to 50 mol.% comonomer, the copolymer thus obtd. then being reacted with H-X-Y-Z; and (ii) use of (I) in non-linear optics. In formulae (I), (III) and (IV), R -R = H or 1-20C alkyl (opt. substd. and/or opt. contg. a heteroatom); R = H, 1-10C alkyl (opt. substd. by Ph or OH), phenyl or benzyl (each opt. substd. by one to four 1-6C alkyl or alkoxy gps), 3-8C cycloalkyl, phenylethyl, diphenylmethyl, naphthyl, carbazoyl, isobornyl, adamantyl or 9-fluorenyl; X = O or NH; Y = 1-20C alkylene, (-CH2O)n-, -(CH2CH2O)n- or -(CH2CH(Me)O)n-, with n = 1-15; Z = H or an opt. substd. residue D with nonlinear optical (NLO) properties; M = comonomer; a and c = 0.3-0.7; and b and d = 0-0.3, with a+b+c+d = 1.

    29.
    发明专利
    未知

    公开(公告)号:DE4237639A1

    公开(公告)日:1994-05-11

    申请号:DE4237639

    申请日:1992-11-07

    Applicant: BASF AG

    Abstract: A process for preparing (meth)acrylate polymers with lateral non-linear optical chromophores and molecular weights of from 5000 to 500,000, comprises reacting polymers of (meth)acryloyl isocyanate in solution with D- omega -hydroxyalkyl chromophores of the formula (I) (I) where D is an electron donor, A is an electron acceptor, R1, R2, R3 and R4 can be identical or different and are each H, alkyl, cycloalkyl, alkoxy or R3 and R4 are each CN, NO2 or CHO or R1 and R2, or R3 and R4, together form a fused-on ring, X is CH and/or N and m is an integer from 2 to 11. The products are suitable for optical components in communications technology.

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