A heterogeneous solvent exchange acylation treatment for paper sheets with long chain fatty acid anhydride
using microwave radiation is described.
A Cyclic Acid Anhydride
and a Diepoxide." US Patent 3 870 664 10 January 1974
Acylated low molecular weight chitosan were synthesized from the nucleophilic acyl substitution reaction of chitosan and acid anhydrides
include butyric, hexanoic, octanoic and decanoic anhydride, as shown in the Fig.
Carboxylic acid anhydrides
, free acids and sulphoxides are not naturally occurring compounds but are artifacts of the oxidation process associated with the aging process.
Chemical properties related to the carboxyl group: Introduction; Hydrolysis; Esterification; Acid chlorides, acid anhydrides
and ketene dimers; Peroxy acids and esters; Long-chain alcohols; Acetals/ketlas and orthoesters; Nitrogen-containing compounds; Sulfonation and other reactions at the a-position; Barton reaction.
Synthesis of fatty acid anhydrides
by reaction with dicyclohexylcarbodiimide.
Unfortunately, like many carbonic acid anhydrides
, TMA can cause skin irritations and allergic effects of the respiratory systems.
Sher, An efficient esterification of pullulan using activated carboxylic acid anhydrides
with iodine, Collect.
The enzymatic hydrolysis and thus detoxication of certain organophosphorus acid anhydrides
, commonly termed "nerve gases," is now well documented (1).
While investigating kinetics and interaction mechanism of epoxides with acid anhydrides
in the presence of imidazoles, these imidazoles were shown to be comparable with tertiary amines in catalytic action.
has been granted a patent for a powder coating composition comprised of a first component comprised of a melt-blended mixture of at least one glycidyl group-containing acrylic resin having an epoxide equivalent weight of from approximately 250 to 1,500 and glass transition temperature of 30[degrees]C to 80[degrees]C and a curing agent selected from the group consisting of dicarboxylic acids, dicarboxylic acid anhydrides
, and mixtures thereof; and a second component dry-blended with the first component, comprising at least one carboxyl-group containing material that has acid number of 10-300 and that is not substantially compatible with the first component.
The powder coating composition comprises a polyester resin comprising an acid structural block selected from the group consisting of aromatic dicarboxylic acids, aromatic dicarboxylic acid anhydrides
, and aromatic dicarboxylic acid esters, and a polyfunctional low molecular weight epoxide crosslinking agent.