Patent application number | Description | Published |
20090105436 | RADICALLY COUPLED PTFE POLYMER COMPOUNDS AND METHOD FOR THE PRODUCTION THEREOF - Radically coupled PTFE polymer compounds useful, for example, as tribo materials, and a method for the production thereof. Radically coupled PTFE polymer compounds are provided which exhibit improved wear resistances with comparable gliding properties, and furthermore there is provided a simple and efficient method for the production of such compounds. Radically coupled PTFE polymer compounds are provided comprising radiation-chemically and/or plasma-chemically modified PTFE powders, on the particle surface of which olefinically unsaturated polymers are chemically radically coupled by a reactive conversion into a melt. There is also provided a method for producing radically coupled PTFE polymer compounds, in which PTFE powders are reactively converted with reactive perfluoroalkyl-(peroxy) radical centers after a radiation-chemical and/or plasma-chemical modification into a melt with the addition of olefinically unsaturated polymers. | 04-23-2009 |
20100021098 | Rolling-Bearing Cage - The present invention relates to a cage for a rolling bearing, in particular for a ball bearing, to a rolling bearing with a cage and to the use of a cage in a high-speed rolling bearing with a characteristic speed value n×dm>1,000,000 mm/min, in particular for industrial spindle-bearing applications and in the medical sector, in particular in dental technology. | 01-28-2010 |
20100222495 | LONG-TERM STABLE OIL PTFE DISPERSION AND METHOD FOR ITS PRODUCTION - The invention relates to the field of chemistry and relates to long-term stable oil PTFE dispersions, such as can be used, for example, in transmissions or bearings, and a method for the production thereof. The object of the present invention is therefore to disclose a long-term stable oil PTFE dispersion as well as a simple and cost-effective method for the production thereof. The object is attained with an oil PTFE dispersion comprising PTFE particles and a monoolefinically or polyolefinically unsaturated oil, wherein molecules of the olefinically unsaturated oil are covalently/chemically coupled to PTFE (primary) particle surfaces via radical reactions, and wherein a permanent charge separation between the PTFE particle surfaces and the coupled oil molecules is present and a fine dispersion of the PTFE particles in the oil or oil mixture is present. The object is furthermore attained through a method in which the modified PTFE (emulsion) polymers are mixed with persistent perfluoro (peroxy) radicals jointly with an olefinically unsaturated oil and subsequently the modified PTFE (emulsion) polymers are subjected to a mechanical stress. | 09-02-2010 |
20100239875 | COATING FOR WOOD MATERIALS AND METHOD FOR THE PRODUCTION THEROF - The invention relates to the field of chemistry and relates to a coating for wood materials, which serves as a basis for subsequent coatings. The object of the present invention is to disclose a coating, with the aid of which the conductivity of the wood materials is improved. The object is attained by a coating, in which the outer and/or inner surface of a wood material is provided with polyelectrolytes which were dissolved or are or were dispersed in water and/or an organic solvent at least up to processing, with a largely uniform distribution and wherein at least 10 g polyelectrolyte is present per square meter. The object is further attained through a method in which an aqueous solution and/or dispersion of polyelectrolytes is applied on the outer and/or inner surface of wood materials, wherein at least 10 g cationized polyelectrolyte solid is applied per square meter coated outer and/or inner surface of the wood material. | 09-23-2010 |
20100249333 | RADICALLY COUPLED PTFE POLYMER COMPOUNDS AND METHOD FOR THE PRODUCTION THEREOF - The invention relates to the field of chemistry and relates to radically coupled PTFE polymer compounds that can be used, for example, as tribo materials, and a method for the production thereof. The object of the invention is to disclose radically coupled PTFE polymer compounds which exhibit improved wear resistances with comparable gliding properties, and furthermore a simple and efficient method for the production of such compounds. The object is attained through radically coupled PTFE polymer compounds comprising radiation-chemically and/or plasma-chemically modified PTFE powders, on the particle surface of which olefinically unsaturated polymers are chemically radically coupled by a reactive conversion into a melt. The object is further attained through a method for producing radically coupled PTFE polymer compounds, in which PTFE powders are reactively converted with reactive perfiuoroalkyl-(peroxy) radical centers after a radiation-chemical and/or plasma-chemical modification into a melt with the addition of olefinically unsaturated polymers. | 09-30-2010 |
20100298461 | Radically Coupled PTFE Polymer Powder and Method for the Production Thereof - The invention relates to the field of chemistry and relates to radically coupled PTFE polymer powders that can be used, for example, as tribomaterials, and a method for the production thereof. The object of the invention is to disclose radically coupled PTFE polymer powders which, when incorporated into a matrix as PTFE polymer compound, exhibit improved wear resistances, and furthermore a simple and efficient method for the production thereof. The object is attained through radically coupled PTFE polymer powders comprising radiation-chemically and/or plasma-chemically modified PTFE powders, onto the particle surface of which homopolymers, copolymers or terpolymers are radically coupled via a reaction in dispersion or in substance. The object is further attained through a method in which PTFE powders with reactive perfluoroalkykperoxy) radical centers after a radiation-chemical and/or plasma-chemical modification are reacted in dispersion or in substance with the addition of polymerizable, olefinically unsaturated monomers, whereby during the reaction a polymer-forming reaction is. | 11-25-2010 |
20110040017 | POLYPHENYLENE SULFIDE (PER)FLUOROPOLYMER MATERIALS AND PROCESS FOR PREPARATION AND USE THEROF - The invention relates to polyphenylene sulfide (per)fluoropolymer materials, which can be used, for example, as tribomaterials. In particular, the present invention relates to polyphenylene sulfide (per)fluoropolymer materials that have an improved tribological behavior. The polyphenylene sulfide (per)fluoropolymer materials comprise a polyphenylene sulfide polymer matrix (PPS polymer matrix) with modified (per)fluoropolymer particles distributed therein in a (poly) disperse manner, which are present bonded to the PPS polymer matrix via chemical couplings. The present invention also relates to a method in which polyphenylene sulfide (PPS) with thiol groups and/or thiolate groups is reactively compounded in a melt with one or more modified (per)fluoropolymer (micro/nano) powders in a single-step or multi-step manner. | 02-17-2011 |
20110172317 | SULFONATED POLYARYLENE COMPOUNDS, MEMBRANE MATERIAL MADE THEREFROM, METHOD FOR THE PRODUCTION THEREOF AND USE - The invention relates to the field of polymer chemistry and relates to sulfonated polyarylene compounds such as can be used for example in ion exchange membranes in fuel cells, as well as a method for the production thereof and the use thereof. The object of the present invention is to disclose hydrolytically and thermally resistant sulfonated polyarylene compounds with a defined degree and position of sulfonation, from which membrane materials with an improved resistance to hydrolysis can be produced. The object is attained through sulfonated polyarylene compounds according to at least one of the general formulas (I)-(IV). | 07-14-2011 |