Abstract:
PROBLEM TO BE SOLVED: To obtain a novel aqueous printing ink suitable for printing on a nonpolar plastic base material and a metal foil. SOLUTION: This ink comprises a) a binder of 5.0-95.0 wt.%, containing a1) an aqueous polymer dispersion obtained by radically polymerizing a mixture M consisting of at least one kind of such an ethylenically unsatd. monomer A as to give a polymer P with a glass transition temp. of -10 to +90 deg.C, in the presence of a protein or a protein degradation product as a protective colloid as well as in the presence or absence of another additive, and a2) if necessary, a base, besides if necessary another additive, b) a pigment of 1.0-40 wt.%; c) a wax of 0-20 wt.% d) if necessary, a perfectly water-miscible organic solvent, e) if necessary, an other additive, and f) water of up to 100 wt.% This ink has good wet adhesion, wet staining resistance, etc.
Abstract:
PROBLEM TO BE SOLVED: To obtain a binder for rust resisting coatings capable of forming good coating film protecting from corrosion without adding a rust resisting pigment. SOLUTION: This aqueous polymer dispersion is obtained by the emulsion polymerization of a mixture A comprising 50-100 wt.% of a 1-18C alkyl (meth) acrylate, a vinyl ester, a vinyl aromatic compound or their mixture in the presence of a protective colloid comprising 2-40 wt.% of a copolymerizable ethylene- based unsaturated compound (monomer) having at least one phosphate residue or a phosphonate residue, 0-98 wt.% of a 1-18C alkyl (meth)acrylate, a vinyl ester or a vinylaromatic compound and 0-50 wt.% of other monomers.
Abstract:
A method for producing an aqueous polymer dispersion by radical emulsion polymerization of an aqueous monomer emulsion, wherein the monomer emulsion is produced continually according to consumption by mixing the components thereof using a mixing device.
Abstract:
The invention relates to a method for producing polymer dispersions of at least one of the monomers that can be polymerized from the following groups: alkyl(meth)acrylates, vinyl esters of carboxylic acids comprising 1-20 C atoms, vinyl aromatic compounds, nitriles, vinyl halides, vinyl ethers, hydrocarbons comprising 2-8 C atoms and monomers containing hydroxyl groups, using emulsion polymerization technology at a polymerization temperature of at least 40 DEG C in the presence of a radical polymerization initiator. The polymer which is produced from at least 85 wt. % of one or several of said monomers is produced in the following way: in a first stage, water, which acts as an inert solvent during the reaction, optionally a dispersant, seed particles and optionally a first sub-quantity of the monomer(s) are added. In a second stage, the initiator is added. In a third stage, the remaining quantity or the total quantity of the monomer(s) is added directly or in the form of an emulsion in the presence of additional water. The first and second stages, or the second and third stages respectively can be carried out as a single-stage, whereas the second and third stages can also be carried out in a gradient operation. In individual or all stages of the reaction mixture that is present as a dispersion, said mixture is displaced by an external circuit (10) that leads from and returns to the polymerization container (2). The circuit comprises one or more hose or cylinder diaphragm pumps (7), which transport the product with a low shear rate and at least one heat exchanger (8), whereby the polymerization temperature lies between 40 DEG C and 120 DEG C.
Abstract:
The present invention relates to a method for producing polymers by aqueous emulsion polymerization of ethylenically unsaturated monomers, comprising at least one hydrophobic monomer with a solubility in water below 0.01 g/l at 25 °C (1 atm) and optionally one or multiple copolymerizable monomers therewith. The method is characterized in that polymerization is carried out in the presence of a non-cyclical polysaccharide capable of forming an inclusion compound. The invention further relates to the polymers obtained by the inventive method as well as to the use of said polymers.
Abstract:
Procedimiento para la transferencia de una dispersión acuosa de polímeros, que presenta una temperatura = 50ºC, a partir de un recipiente 1, a través de un conducto de conexión, hasta un recipiente vacío 2, caracterizado porque el recipiente 2 contiene vapor de agua antes y durante la transferencia y la presión parcial del vapor de agua en el recipiente 2 es mayor o igual que el 70% y menor o igual que el 100% de la presión parcial del vapor de agua de la dispersión acuosa de los polímeros en el recipiente 1.
Abstract:
The present invention relates to the production of a polymer powder with improved powder properties, and to its use as impact modifier for rigid polyvinyl chloride (PVC) applications. The impact modifier is composed of emulsion polymer particles which have a core-shell structure, where the shell is composed of a hard polymer and the core is composed of a soft, crosslinked rubber polymer.
Abstract:
The invention relates to the production of a polymer powder with improved pulverulent characteristics and to the use of said powder as an impact- resistance modifier for hard polyvinyl chloride (PVC) applications. The impa ct- resistance modifier consists of emulsion polymer particles with a core-shell structure, said shell being composed of a hard polymer and the core of a sof t, vulcanised rubber polymer.
Abstract:
Method for transferring an aqueous polymer dispersion, at a temperature of >/= 50 DEG C, from a container (1) to a container (2), by means of a connecting line.