ES380900A1 - Procedure for the preparation of solid polymers. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Process for the preparation of solid polymers, having carboxyl or carboxylate groups and hydroxyl groups, as well as optionally in secondary amounts, straight-chain or cross-linked vinyl or carbonyl groups in the main chain containing predominantly CC bonds, which A) are predominantly made up of units of the general formulas **(See formula)** as main components and eventually have in addition to these, in secondary number, also units of the general formula **(See formula)** where A represents hydrogen, a valence of a monovalent or polyvalent metal, especially an alkali metal, preferably sodium, or ammonium, R and R1 are the same or different and signify an alcohol group with 1 to 6; carbon atoms, especially a methyl group, or preferably a hydrogen atom, and R1 further represents a halogen atom, especially a chlorine atom, where units (I), (II), (III) and (IV) can be arranged. in any order of succession; B) have an average frequency of units (I), (II), (III) and (IV) that, even in the absence of units (II) or (III) and / or (IV), corresponds to a proportion from carboxyl or carboxylate groups to hydroxyl groups ranging from 1.1 to 16, preferably from 2 to 9; C) have a minimum degree of polymerization of 3, especially from 3 to 5000, preferably from 3 to 600, characterized in that in a manner known per se: a) known acrylic acrolein or substituted acrylic acids are copolymerized in the presence of radical catalysts or Redox catalysts, and then a reaction according to Cannizzaro is carried out; or b) alkoallallylic is copolymerized with acrylic acid or substituted acrylic acids; or c) esters of acrylic acid or other acrylic acid derivatives, such as acryl-nitrile, are copolymerized with esters of vinyl alcohol, and the copolymers are then saponified; or d) acrolein is copolymerized with allyl alcohol or its derivatives or with derivatives of vinyl alcohol and the copolymers are then subjected to oxidation; or e) is subjected to allyl acrylate to cyclopolymerization with simultaneous saponification; or f) a cyclo-copolymerization of allyl acrylate with acrylic acids is carried out with simultaneous saponification; or g) acrolein is polymerized by itself or optionally together with appropriate comonomers for copolymerization with acrolein, and then subjected to oxidation to the homopolymer or copolymer; or preferably h) acrolein is oxidatively polymerized alone or optionally together with appropriate comonomers for copolymerization with acrolein, and the homopolymer or copolymer is then reacted with a strong base, especially with an alkali hydroxide, according to Cannizzaro; in each case the polymerization conditions and the other reaction conditions must be chosen, in oxidation reactions especially the amount of the oxidizing agent, so that the necessary proportion of carboxyl or carboxylate groups to the hydroxyl groups in the final product can be maintained and the minimum degree of polymerization of 3. (Machine-translation by Google Translate, not legally binding)