Abstract:
The invention relates to a method for reesterifying or esterifying side chains in polymers. Said method comprises the following steps: a) a copolymer is produced which is obtained by polymerizing aa) at least one (meth)acrylate of general formula (I) as component A, wherein R 1 represents H or CH 3 while R 2 represents H or an alkyl radical that can be optionally substituted with functional groups such as acryl groups, ether groups, amino groups, epoxy groups, halogen groups, or sulfonic acid groups, and ab) at least one monomer of general formula (II) as component B, wherein R 3 has the same meaning as R 1 , R 4 has the same meaning as R 2 , and n = 1 to 40, and b) reesterifying or esterifying the carboxyl group containing the radical R 4 with an alcohol in the presence of an enzyme catalyzing the reesterification or esterification process. The invention also relates to said polymers and the use thereof.
Abstract:
The invention relates to a method for producing an aqueous polyamide dispersion by the hydrolase catalysed conversion of an amino acid compound in an aqueous medium.
Abstract:
Disclosed is a method for the enzyme-catalyzed production of (alk)acrylates of general formula (I) by esterifying or transesterifying aryl ketones of general formula (II) with (alk)acrylic acid, an (alk)acrylic acid ester of general formula (III), or an (alk)acrylic acid anhydride of general formula (IIIa) in the presence of an enzyme which catalyzes esterification or transesterification.
Abstract:
The invention relates to a novel method for the enzymatic synthesis of poly(oxyalkylene)acrylamide as well as the use thereof for synthesizing polymers.
Abstract:
The invention relates to a method for carrying out the enzymatic synthesis of polyol acrylates, to a method for producing polymeric polyol acrylates, to the polymers that can be obtained according to this method, and to the their use for producing radiation-curable and thermally curable paints.
Abstract:
Production of (meth)acrylates (I) of cyclic or open-chain N-hydroxyalkylated amides (II) involves esterification of (II) with (meth)acrylic acid or ester exchange with (meth)acrylic ester(s) in the presence of heterogeneous catalyst(s) selected from inorganic salts (III) and enzymes (IV). Production of (meth)acrylates (I) of cyclic or open-chain N-hydroxyalkylated amides (II) of formulae (IIA) and (IIB) respectively involves esterification of (II) with (meth)acrylic acid or ester exchange with (meth)acrylic ester(s) in the presence of heterogeneous catalyst(s) selected from inorganic salts (III) and enzymes (IV). Z 1>oxygen (O), sulfur (S), (un)substituted phosphorus (P) or mono- or un-substituted nitrogen (N-R 3>); R 1>, R 3>2-20 C alkylene, 5-12 C cycloalkylene, 6-12 C arylene or a 2-20 C alkylene group with 1 or more O and/or S atoms, (un)substituted imino groups and/or cycloalkyl, -(CO)-, -O(CO)O-, -(NH)(CO)O-, -O(CO)(NH)-, -O(CO)- or -(CO)O- groups in the chain, where any of these groups may be substituted by R; R : aryl, alkyl, aryloxy, alkoxy, heteroatoms and/or heterocycles; or R 2>-OH : -[X i] k-H; R 3>, R 4>, R 5>H, 1-18 C alkyl, 2-18 C alkyl, optionally with O and/or S atoms and/or (un)substituted imino groups in the chain, 2-18 C alkenyl, 6-12 C aryl, 5-12 C cycloalkyl or a 5-7-membered heterocycle containing O, N and/or S atom(s), where any of these groups may be substituted R; or R 3>R 6>a group forming 5-12-membered ring; k : 1-50; X i-CH 2-CH 2-O-, -CH 2-CH 2-N(H)-, -CH 2-CH 2-CH 2-N(H)-, -CH 2-CH(NH 2)-, -CH 2-CH(NHCHO)-, -CH 2-CH(CH 3)-O-, -CH(CH 3)-CH 2-O-, -CH 2-C(CH 3) 2-O-, -C(CH 3) 2-CH 2-O-, -CH 2-CH 2-CH 2-O-, -CH 2-CH 2-CH 2-CH 2-O-, -CH 2-CHVin-O-, -CHVin-CH 2-O-, -CH 2-CHPh-O- or -CHPh-CH 2-O-; Ph : phenyl; Vin : vinyl; i : 1-k; and R 5>unsubstituted 1-18 C alkyl, 6-12 C aryl or 5-12 C cycloalkyl if Z 1> = O. [Image].
Abstract:
The invention relates to a method for producing highly functional, hyper branched polyester, characterised by the reaction of a reaction solution containing solvent and (a) one or more dicarboxylic acids or one or more derivatives thereof with one or more at least trifunctional alcohols, (b) or one or more tricarboxylic acids or high polycarboxylic acids or one or more derivatives thereof with one or more dioles, (c) or one or more tricarboxylic acids or higher polycarboxylic acids or one or more derivatives thereof with one or more trifunctional alcohols, (d) or one or more di- or polyhydroxycarboxylic acids, (e) or one or more hydroxydicarboxylic acids or hydroxypolycarboxylic acids, or a mixture of at least two of the above-mentioned reaction solutions in the presence of an enzyme at temperatures greater than 60 DEG C and at a pressure which is greater than 500mbar.