Abstract:
PROBLEM TO BE SOLVED: To provide a polymer dispersion which provides improved mechanical properties such as flexibility and break strength, cohesive force and serviceable time to a hardened material for construction. SOLUTION: The aqueous polymer dispersion is obtained by polymerizing a) at least one kind of ester of acrylic acid and 2-12C alkanol of 40-80 mass%, b) at least one kind of aromatic vinyl monomer and/or at least one kind of ester of methacrylic acid and 1-4C alkanol of 10-40 mass% and c) at least one kind of monoester of 2-10C alkanediol and acrylic acid or methacrylic acid of 2-15 mass%. The dispersion free from ammonia.
Abstract:
PROBLEM TO BE SOLVED: To provide a building material having the compressive strength and bending tensile strength improved by adding a suitable auxiliary substance. SOLUTION: This is the mixture of the hydraulic building material and minute particles of a solid hydrogel forming polymer which contain ≤2 mass% particles having the particle size exceeding 200 μm. A crosslinked polymer having an acid radical is used particularly as the solid hydrogel forming polymer. COPYRIGHT: (C)2004,JPO
Abstract:
The invention relates to novel comb polymers supporting, on a carbon backbone, poly-C 2 -C 4 -alkylene ether side chains A and functional groups B, which exist in the form of anionic groups at a pH > 12, and to the salts of comb polymers of this type. The invention also relates to the use of these comb polymers as additives in preparations containing a mineral binder. The polyalkylene ether side chains A have the following formula *-U-(C(O)) k -X-(Alk-O) n -Y-Z A, wherein: * represents the binding site to the carbon backbone of the comb polymer; U represents a chemical bond or an alkylene group with 1 to 8 C atoms; X represents oxygen or a group NR; k represents 0 or 1; n represents an integer whose mean value, with regard to the comb polymer, ranges from 5 to 300; Alk represents C 2 -C 4 alkylene, Alk being able to be the same or different within the group (Alk-O) n ; Y represents a linear or branched alkylene group with 2 to 8 C atoms, which can support a phenyl ring; Z represents a 5- to 10-membered nitrogen heterocyclic compound that, as ring members, can comprises, in addition to the nitrogen atom and the carbon atoms, 1, 2 or 3 additional heteroatoms selected among oxygen, nitrogen and sulfur, the nitrogen ring members being able to contain a group R', and 1 or 2 carbon ring members can exist in the form of a carbonyl group; R represents hydrogen, C 1 -C 4 alkyl or Benzyl, and; R' represents hydrogen, C 1 -C 4 alkyl or Benzyl.
Abstract:
The invention relates to the use of comb polymers which comprise a carbon backbone comprising polyether groups of formula A *-U-(C(O)) k -X-(Alk-O) n -W A wherein * is the binding point on the carbon backbone of the comb polymer, U represents a chemical binding or an alkylene group having 1 - 8 C-atoms, X represents oxygen or a group NR, k is 0 or 1, n represents a whole number, wherein the average, in relation to the comb polymer, lies in the region of between 5 - 300, Alk represents C 2 -C 4 -alkylene, Alk in the group (Alk-O) n can be identical or different, W represents hydrogen, a C 1 -C 6 -alkyl- or a aryl radical or the group Y-Z, Y represents a linear or cross-linked alkylene group having 2 - 8 C-atoms and which can support a phenyl ring, Z represents a 5 10-membered nitrogen heterocycle which is linked by nitrogen, and the ring members, in addition to nitrogen atoms and carbon atoms, are 1, 2 or 3 additional heteroatoms which are selected from oxygen, nitrogen and sulphur, whereby the nitrogen ring members can comprises a R' group, and 1 or 2 carbon ring members can be a carbonyl group, R represents hydrogen, C 1 -C 4 -alkyl or benzyl, and R' represents hydrogen, C 1 -C 4 -alkyl or benzyl. The invention also relates to functional B groups which are in the form of anionic groups when pH >12, and to the salts thereof as grinding agents in preparations containing cement.
Abstract:
The invention relates to the use of homopolymers or copolymers of (meth)acrylic acid or copolymers of C 3 -C 40 monoolefins with ethylenically unsaturated C 4 -C 6 dicarboxylic acid anhydrides as additives in ceramic materials, especially in clay, in order to produce ceramic construction materials, such as bricks and roofing tiles as well as ceramic materials containing said additives.
Abstract:
The invention relates to a protective device against the effects of water, with an at least partly water-permeable shell, which comprises a mixture of sand and a water-insoluble, redispersible, synthetic polymer powder, whereby the polymer has a glass transition temperature of less than 50 DEG C. Said protective device has improved mechanical rigidity and water resistance.
Abstract:
A process for preparing poly-C2-C4-alkylene glycol mono(meth)acrylic acid esters by reacting (meth)acrylic anhydride with a poly-C2-C4-alkylene glycol carrying at least one OH group in the presence of abase having a solubility in the poly-C2-C4-alkylene glycol of not more than 10 g/l at 90° C.
Abstract:
A process for the preparation of a readily water-redispersible polymer powder by spray drying of an aqueous polymer dispersion in the presence of a novel spray drying assistant.