Abstract:
The invention relates to the use of special mixtures of at least two polycarboxylic acids as crosslinker components for thermally curing powder-lacquer binding agents having groups that are capable of reacting with carboxyl groups. The mixtures include at least two polycarboxylic acids each melting above 95null C. and having up to 20 carbon atoms and consist of at least 5 wt. %, of the polycarboxylic acid with the lowest melting point and at least 10 wt. %, of the polycarboxylic acid with the highest melting point of all polycarboxylic acids present in the mixture to at least 5 wt. %. Additionally, the polycarboxylic acid mixture is a solid below 40null C. and a liquid above 160null C.
Abstract:
A granular epoxy resin is made by pulverizing an epoxy resin which is solid at ordinary temperature and can exhibit excellent fluidity during molding because of its low melt viscosity in which the total content of components having a molecular weight of 500 or less among components of n1null0 in the following general formula (1) and/or components of n2null0 in the following general formula (2) is 50% by mass or more of the entire epoxy resin, or, the total content of components having a molecular weight 400 or less among components of n1null0 in the following general formula (1) and/or components of n2null0 in the following general formula (2) is 20% by mass or more of the entire epoxy resin. The content of low molecular weight compounds having a molecular weight 200 or less in the granular epoxy resin is 0.3% by mass or less. The granular epoxy resin allows easy handling because it hardly causes blocking during storage and transportation. 1
Abstract:
The invention relates to polymerizable preparations that contain: (a) 1 to 80% by weight of an epoxide or of a mixture of epoxides of the general formula (I), wherein n and m independently are 1, 2, 3, or 4, and wherein the molar mass of the epoxide or the average molar mass of the mixture of epoxides is 360 to 3000 g/mole, (b) 0 to 80% by weight of an epoxide or of a mixture of epoxides that are different from (a), (c) 3 to 85% by weight of fillers, (d) 0.01 to 25% by weight of initiators, retarders and/or accelerators, (e) 0 to 25% by weight of adjuvants, the percentages relating to the overall weight of the individual preparation.
Abstract:
The invention relates to a hot-melt adhesive composition for use in a textile product, in particular a tufted carpet, containing a polymer chosen from the group of polyamides, with a number-average molecular mass of 500-5000 g/mol and functional end groups. This hot-melt adhesive composition can be applied in various forms and results in a good bond of pile material to support material. The invention also relates to a process for the preparation of a textile product, in which the hot-melt adhesive composition is used, and also to the textile product thus obtained and the use thereof as floor or wall covering.
Abstract:
The present invention discloses reworkable epoxy compositions suitable for encapsulation of and underfill for electronic components comprising (a) a curable epoxy component which is the reaction product of an epoxidized 1-alkenyl ether or 1-cycloalkenyl ether and a polycarboxylic acid, the reaction product being substantially free of unreacted acid or acid impurities; and (b) a curing agent for the epoxy component, wherein the reaction products of the epoxy composition are reworkable. The cured epoxy compositions of this invention contain thermally labile weak null-alkoxy ester linkages which provide for the reworkable aspect of the invention.
Abstract:
A two-part epoxy adhesive having a resin component containing a mixture of an epoxy resin and an internally flexibilized epoxy resin and a hardener component containing a mixture of a flexibilizer and an unmodified or modified aliphatic amine or combinations thereof. The resin component and hardener component are mixed and applied to substrates, or applied to substrates and mixed, an then allowed to cure yielding a cured epoxy resin having a tensile elongation at room temperature of greater than 30%. The initial curing time is less than 3 hours.
Abstract:
The present invention is a pigmented coating composition, including a film-forming polymer comprising an epoxide polymer. The coating contains a mixture of crosslinking agents wherein at least one crosslinking agent is a polyamide functional compound and at least one crosslinking agent is a phenalkamine compound. The mixture of crosslinking agents is useful in stabilizing the pigment in the coating composition.
Abstract:
The present invention provides an aqueous coating composition for the inner surface of a can, comprising a carboxyl-containing, acrylic-modified epoxy resin (C) prepared by reacting a high-molecular-weight epoxy resin (A) that has a number average molecular weight of 3,000 to 30,000 and is a reaction product of a specific low-molecular-weight cresol novolac epoxy resin (a) and a specific low-molecular-weight cresol novolac phenol resin (b), with a carboxyl-containing acrylic resin (B); the carboxyl-containing, acrylic-modified epoxy resin (C) being neutralized and dispersed in an aqueous medium. The aqueous coating composition of the present invention has good application workability and good film performance, and is free from environmental hormone problems caused by bisphenol A.
Abstract:
The present invention relates to a thermoset material with improved impact resistance comprising: 99 to 20% of a thermoset resin, 1 to 80% of an impact modifier comprising at least one copolymer chosen from copolymers comprising S-B-M, B-M and M-B-M blocks, in which: each block is connected to the other by means of a covalent bond or of an intermediate molecule connected to one of the blocks via a covalent bond and to the other block via another covalent bond, M is a PMMA homopolymer or a copolymer comprising at least 50% by weight of m thyl methacrylate, B is incompatible with the thermoset resin and with the M block and its glass transition temperature Tg is less than the operating temperature of the thermoset material, S is incompatible with the thermoset resin, the B block and the M block and its Tg or its melting temperature M.t. is greater than the Tg of B. S is advantageously polystyrene and B polybutadiene. The thermoset resin advantageously originates from the reaction of a thermosetting epoxy resin and of a hardener.