摘要:
Reaction products, from diphenylmethane-2,4'-diisocyanate with a fraction of at least 95 wt. % of 2,4' isomer with at least one polyether polyol and/or polyalkylene glycol with a molecular weight of less than 1,000 and/or a crystalline or part-crystalline, or glassy amorphous polyester polyol and, optionally, polyester polyols and/or polyether polyols with a molecular weight greater than 1,000, which are liquid at room temperature, can be reacted to give adhesive compositions with a very low content of residual monomeric diisocyanate of less than 0.5, preferably less than 0.25 wt. %. Said hot-melt adhesive compositions comprise, in addition to the low content of monomeric diisocyanate a high fusion stability and a low viscosity.
摘要:
The invention relates to a multi-component adhesive that contains at least two components A and B, wherein a) component A contains at least one polymer dispersion, comprising water, at least one polymer producible by emulsion polymerization, at least one protective colloid, at least one water-soluble, acidic metal salt, and b) component B contains at least one cross-linking resin. The invention further relates to an adhesive kit that contains at least two of the above-mentioned components, and to the use of components A and B in multi-component adhesives.
摘要:
The invention relates to cleaning agents based on low volatile monohydroxy compounds and depolymerization catalysts which are suitable for fast removal of reactive polyurethane hot melt adhesives and their hardening and cracking products from production and processing devices and facilities at low temperatures.
摘要:
Mono-unsaturated fatty acids or their derivates are produced by hydrogenating poly-unsaturated fatty acids or their derivates at 0 to 150 °C, in a pressure range from 800 to 1500 hPa, with hydrogen and in the presence of a catalyst system that contains: a) a palladium salt and b) a carbonic acid ester, as well as, if necessary, c) a base for neutralizing the acids formed during the reduction of the palladium salt, d) water and/or a water-immiscible, inert solvent.
摘要:
On produit des acides gras mono-insaturés ou leurs dérivés en hydrogénant des acides gras polyinsaturés ou leurs dérivés à des températures comprises entre 0 et 150 °C, sous une pression dans une plage comprise entre 800 et 1.500 hPa, avec de l'hydrogène et en présence d'un système catalyseur contenant: a) un sel de palladium et b) un ester d'anhydre carbonique; ainsi que, le cas échéant, c) une base de neutralisation des acides formés lors de la réduction du sel de palladium; d) de l'eau et/ou un solvant immiscible avec de l'eau.
摘要:
The invention relates to compositions containing the reaction products of a polyisocyanate and a polyester block copolymer, and to a method for producing them. The inventive compositions are suitable for use as moisture-hardening hot-melt-type adhesives. The hot-melt adhesive composition can also contain a reaction product of a polyisocyanate and a polyesterpolyol and/or a reaction product of a polyisocyanate and a polyetherpolyol. Polyurethane-hot-melt adhesive compositions of this type have good creep resistance and interfacial bonding values on plastics, as well as very high strength values.
摘要:
Compositions containing a reaction product of a stochiometic excess of a polyisocyanate with hydroxy functional polyester-ether-block copolymers based on aromatic dicarboxylic acids, a reaction product of a polyisocyanate with a polyester polyol and/or optionally, a reaction product of a polyisocyanate with a polyester polyol and/or, optionally, a reaction product of a polyisocyanate with a polyether polyol and, optionally, non-reactive thermoplastic polymers. Said compositions are suitable for use as reactive melt adhesives. The use of reaction products of the hydrofunctional polyester-ether block copolymers with polyisocyantaes enables the block copolymer constitutional unit to be solidly incorporated into the adhesive matrix, increases the reactive part in the adhesive composition and results in better heat resistance and hydrolysis resistance while, at the same time, lowering ther melting point of the polyester-ether copolymer components without any adverse effects on heat resistance and setting speed. The compatibility of the components of the composition is also increased as a result of said incorporation into the polymer matrix.
摘要:
The invention relates to a polymer dispersion which contains water, at least one polymer that has been produced by emulsion polymerisation, at least one protective colloid, at least one water-soluble acidic metallic salt and at least one cross-linking resin that is based on phenol-formaldehyde condensation products, hydroxymethyl-substituted imidazolidinones, such as 1,3-dimethylol-4,5-dihydroxy-imidazolidinone (4,5-dihydroxy-N,N'-dimethylolethylene urea), hydroxymethyl-substituted pyrimidinones, or hydroxymethyl-substituted triazinones or their auto-condensation products, or mixed condensates from two or more of the aforementioned compounds, or a mixture or two or more of the aforementioned compounds.
摘要:
By covering humidity-sensitive meltable masses with an insertion that consists of a thermally stable and water vapour-tight plastic foil (1) and of a plastic disk (2) made of a thermoplastic material with a linear coefficient of expansion of at least 6.10-5/K, the surface of said meltable masses (6) may be self-sealingly closed. The meltable mass is reliably protected by this self-sealing closure against the penetration of humidity, even after a long storage. Thus closed containers with humidity-sensitive meltable masses may thus be stored for a long time.