An efficient synthesis of α-acyloxyacrylate esters as candidate monomers for bio-based polymers by heteropolyacid-catalyzed acylation of pyruvate esters
An efficient synthesis of α-acyloxyacrylate esters as candidate monomers for bio-based polymers by heteropolyacid-catalyzed acylation of pyruvate esters
A series of α-acyloxyacrylate esters are candidate monomers for bio-based polymers, converted from biomass feedstock. Polymers from these monomers are useful materials for bio-based plastics showing high heat resistance and transparency. In this paper, a new efficient method for α-acyloxyacrylate ester synthesis with a strong inorganic acid, heteropolyacid, is presented. The reaction in the presence of the heteropolyacid catalyst was carried out in liquid phase under mild conditions and showed higher productivity than that of the conventional synthesis with a typical organic acid, p-toluenesulfonic acid. Among the various heteropolyacids examined, α-Keggin-type tungsten-based phosphotungstic acid, H3PW12O40, showed the best performance, suggesting that the acid strength of the heteropolyacid is the crucial property for this reaction. We also found that pyruvate ester was consecutively converted into α-acyloxyacrylate estervia2,2-diacyloxypropionate ester.
α-Acyloxyacrylate esters were efficiently synthesized from pyruvate esters and carboxylic anhydrides under mild conditions. These esters are potential candidate monomers for bio-based polymers with high durability and transparency. Tungsten-based Keggin type heteropolyacids, especially H3PW12O40, worked more effectively as catalysts for this reaction than other typical acids.
Multifunctional polymers, method for the production and use thereof
申请人:——
公开号:US20030236178A1
公开(公告)日:2003-12-25
Multifunctional polymers containing polymerized units of
(a) &agr;-Acyloxyacrylonitrile, &agr;-haloacrylic acid, &agr;-acyloxyacrylic ester and/or &agr;-hydroxyacrylic acid,
(b) monoethylenically unsaturated carboxylic acids,
(c) vinyl esters of saturated aliphatic monocarboxylic acids and/or vinyl alcohol and optionally
(d) other monoethylenically unsaturated monomers copolymerizable with said monomers (a) to (c) and optionally
(e) crosslinkers containing at least two ethylenically unsaturated double bonds
and having a K value of at least 7 (determined after H. Fikentscher in acetone at 25° C. and a polymer concentration of 1% by weight), processes for preparing multifunctional polymers by copolymerizing monomer mixtures of
(a) &agr;-acyloxyacrylonitrile, &agr;-haloacrylic acid and/or &agr;-acyloxyacrylic ester,
(b) monoethylenically unsaturated carboxylic acids,
(c) vinyl esters of saturated aliphatic monocarboxylic acids and optionally
(d) other monoethylenically unsaturated monomers copolymerizable with said monomers (a) to (c) and optionally
(e) crosslinkers containing at least two ethylenically unsaturated double bonds
in the presence of polymerization initiators that form free radicals and partially or completely hydrolyzing the polymerized monomer units (a) and (c) in the copolymers thus obtainable and use of the multifunctional polymers in laundry detergents and cleaners, to bind polyvalent metal ions, as a stabilizer in textile bleaching and the bleaching of pulp for papermaking.