Copolymer with optical brightener, used for whitening textiles, paper and plastics, contains comonomer units to which an optical brightener is attached by covalent bonds

摘要

Copolymers (CP) consisting of units (A) and units (B), containing 4-30 wt.% of an optical brightener (C) attached to (B) by covalent bonds. Copolymers (CP) consisting of units (A) and units (B), containing 4-30 wt.% of an optical brightener (C) attached to (B) by covalent bonds. Independent claims are also included for: (a) production of (CP) by radical copolymerization of a monomer (A') with a monomer (B') to which (C) is attached by covalent bonds; (b) production of (CP) by making a copolymer containing pendant groups which can react with (C) and then reacting these groups with (C); (c) a polymerizable monomer of formula Ar-CH=CH-pPhe-pPhe-CH=CH-mPhe-OCO-C(CH3)=CH2 (VII) for use in process (a); (d) preparation of a polymerizable monomer of formula Ar'-CH=CH-pPhe-pPhe-CH=CH-mPhe-R1 (VIII) by coupling a boronic acid of formula Ar'-CH=CH-pPhe-B(OH)2 (IX) with a compound of formula Br-pPhe-CH=CH-mPhe-OH to give a biphenyl derivative of formula Ar'-CH=CH-pPhe-pPhe-CH=CH-mPhe-OH which is then reacted with a compound R1H; (e) preparation of a monomer of formula (VIII) in which R1 is a (meth)acrylamido group, by coupling boronic acid (IX) with a bromo-nitro compound (Br-pPhe-CH=CH-mPhe-NO2), then reducing the product to the corresponding amine and reacting the amine with (meth)acrylic acid. Ar = 3,5-di-tert.-butylphenyl; pPhe = 1,4-phenylene; mPhe = 1,3-phenylene Ar' = 3,5-dialkylphenyl, preferably 3,5-di-tert.-butylphenyl; R1 = (meth)acryloyloxy.