摘要:
The present invention relates to a continuous process for the manufacture of highly-branched homo- or copolymers of C 3 -C 8 ethylenically unsaturated mono- or dicarboxylic acid as well as the anhydrides and salts thereof (monomer A) by means of free-radical polymerization of monomer A and optionally water-soluble, monethylenically unsaturated comonomers (monomer B) in an aqueous medium in the presence of at least one water-soluble initiator, wherein the polymerization takes place in at least one tubular reactor segment.
摘要:
The present invention relates to aqueous polymer dispersions having a polymer content of at least 55 wt.-%, said dispersions being suitable for adhesives. The invention also relates to a method for producing said aqueous polymer dispersions and the use of the aqueous polymer dispersions in adhesives or adhesive compositions, especially in adhesives for transparent substrates such as plastic labels. The aqueous polymer dispersions have a polymer content of at least 55 wt.-% relative to the total weight of the dispersion, wherein the polymer is made up of ethylenically unsaturated monomers M and has a glass transition temperature of less than -10°C, wherein the dispersed polymer particles have a polymodal particle size distribution, wherein at least 70 wt.-%, preferably at least 75 wt.-%, in particular at least 80 wt.%, especially preferably at least 85 or at least 90 wt.-% of the polymer particles have a particle diameter of less than 350 nm, in particular less than 340 nm, especially less than 330 nm.
摘要:
The invention relates to a method for producing aqueous solutions of acrylic acid polymers by polymerizing acrylic acid in feed mode with a radical starter in the presence of hypophosphite in water as a solvent, wherein (i) water and optionally acrylic acid in acidic, non-neutralized form, optionally one or more ethylenically unsaturated comonomers, optionally aqueous hypophosphite solution, and optionally initiator are introduced, (ii) acrylic acid in acidic, non-neutralized form, optionally one or more ethylenically unsaturated comonomers, aqueous radical starter solution, and aqueous hypophosphite solution are added, (iii) after the end of the acrylic acid feed, a base is added to the aqueous solution, wherein the comonomer content does not exceed 30 wt% with respect to the total monomer content, characterized in that the acrylic acid, the aqueous radical starter solution, and the aqueous hypophosphite solution are added in such a way that, over a time period in which at least 75% of the acrylic acid is converted, the molar ratio x of acrylic acid to phosphorus-bonded hydrogen [AA]/[P-H] has a value x that is constant to ±0.5 and that lies in the range of 0.8 to 2.
摘要:
The invention relates to a mixer-heat exchanger insert or a mixer-heat exchanger insert assembly and to a mixer-heat exchanger comprising a corresponding mixer-heat exchanger insert assembly which has an improved mixing and temperature control behavior and which is less prone to fouling. The mixer-heat exchanger insert comprises a first group of hollow body plates (10, 11) with an inner volume (13) and a second group of hollow body plates (20, 21) with an inner volume (23). The hollow body plates (10, 11) of the first group are inclined in a first direction (RI) relative to a longitudinal extension direction (L) of the mixer-heat exchanger insert (1), and the hollow body plates (20, 21) of the second group are inclined in a second direction (R2) relative to the longitudinal extension direction (L) of the mixer-heat exchanger insert (1). The hollow body plates (10, 11) of the first group laterally abut the hollow body plates (20, 21) of the second group, and the inner volumes (13) of the first hollow body plates (10, 11) are connected to the inner volumes (23) of the second hollow body plates (20, 21) such that the inner volumes (13) of the first group and the inner volumes (23) of the second group are part of a continuous total inner volume (13, 23) which is designed to conduct a temperature controlling fluid.
摘要:
The invention relates to a mixer-heat exchanger insert or mixer-heat exchanger, having a geometry that leads to less fouling of a fluid to be temperature-controlled, wherein the mixer-heat exchanger insert has an extent in a longitudinal extension direction (L), comprising a temperature-control fluid inlet (110) and a temperature-control fluid outlet (120) and a volume (130) for guiding a temperature-control fluid, which volume extends between the temperature-control fluid inlet (110) and the temperature-control fluid outlet (120), and the mixer-heat exchanger insert has a first tubular section (10), and wherein the tubular section (10) extends in the longitudinal extension direction, wherein the tubular section is led in loops (10a, 10b, ...) transversely to the longitudinal extension direction (L).
摘要:
The invention relates to a method and suitable adhesive material compositions for adhering a substrate on cold and moist surfaces, wherein the surface temperature is lower than the dew point temperature of the air which is in contact with the surface, and wherein the adhesive material composition contains an adhesive material polymer which is formed from specific quantities of 2-ethylhexylacrylate, monomers selected from C1 to C2 alkyl(meth)acrylates, styrene, acid monomers and optionally further monomers in the presence of molecular weight regulators.