Abstract:
The present invention relates to the use of an aqueous polymer dispersion comprising dispersed particles of at least one polymer A1 having a glass transition temperature, Tg, of from −20° C. to +35° C. and obtainable through free-radical emulsion polymerization in the presence of a polymer A2 synthesized from from 50 to 99.5% by weight of at least one ethylenically unsaturated monocarboxylic and/or dicarboxylic acid whose carboxylic groups can form an anhydride group, or mixtures thereof, from 0.5 to 50% by weight of at least one ethylenically unsaturated compound selected from the esters of ethylenically unsaturated monocarboxylic acids and the monoesters and diesters of ethylenically unsaturated dicarboxylic acids with an amine containing at least one hydroxyl group, and up to 20% by weight of at least one further monomer as binder for producing abrasive material.
Abstract:
The invention concerns an apparatus for mechanically treating paper and includes two engraved cylinders each mounted between two support plates of the apparatus in a mutually tangential manner by means of cylindrical bearings affixed in corresponding housings fitted into the support plates, a first roller of the engraved rollers being mounted on a cradle pivoting relative to a stationary base plate on which is mounted the second engraved roller, the invention being characterized in that the cylindrical bearings are affixed in housings bounded at least in part by a detachable bracket which, when detached, frees a radial aperture through which the cylindrical bearing can be removed along a radial direction.
Abstract:
There is described a recyclable carpet floor covering comprising a backing, a tied-in pile yarn and a back finish with or without a secondary backing adhered to the (primary) backing, wherein the pile yarn, the (primary) backing and a secondary backing comprise polyester fibers and the back finish for the (primary) backing and for adhering a secondary backing comprises a consolidating and adhering composition comprising a combination of 10-70% by weight of a water-soluble or -dispersible first polyester A, and 90-30% by weight of a water-insoluble second polyester B, There are further described a process for producing the recyclable carpet floor covering and also an aqueous preparation of the consolidating and adhering composition comprising the polyesters A and B and the use thereof for consolidating the carpet floor coverings and optionally adhering them to secondary backings.
Abstract:
Several pyrotechnic smoke screen sets are arranged on top of each other. Each of them has an igniter and a decomposition sets. They are in separate containers which, in succession, are ignited by a delay device at a desired interval.
Abstract:
A rotational viscosimeter is used for determining the flow properties of flowable mixtures having coarse grain components; the device includes a pot with a centrally journaled, rotatable cylinder therein wherein the annular gap between the inner cylinder and pot is at least five times greater than the largest particle diameter of the solids located in this annular gap, there is a sealing liquid located in the pot under and around a lower end of the inner cylinder at least up to the lower lip formed thereon. The surface of the inner cylinder and/or the inner surface of the pot beyond the sealing liquid level is roughened or provided with grooves.
Abstract:
To improve energy efficiency of prior art processes while preserving the standards of quality and total yield of desired end products, a process for the preparation of phenolic compounds is proposed. The process of the invention comprises working-up of the cleavage product mixtures by distillation, which comprises resolving the cleavage product mixture into at least three fractions in a single distillation step by feeding the cleavage product mixture to the side of a distillation column, removing a first fraction comprising the ketone at the top of the distillation column, removing a second fraction comprising the phenolic compound at the bottom of the distillation column, and removing a third fraction comprising unreacted the alkylaryl compound and the hydroxy ketone, and water, as side stream, whereby the side stream take-off is situated above the feed of cleavage product mixture to the distillation column, characterized by removing heat from the distillation column, whereby the heat take-off is situated above the side stream take-off of the third fraction, and a process for separating phenol from cleavage product mixtures, wherein the cleavage product mixture prior feeding into the distillation column, is preheated to a temperature of above 70° C. at standard pressure, preferably to a temperature of above 100° C., more preferably to a temperature between 110° C. and 180° C., most preferred to a temperature of about 140° C. to 146° C., and an apparatus suitable therefore.
Abstract:
The present invention relates to the use of a heat-curable aqueous composition comprising dispersed polymer particles of at least a) one polymer A1 comprising, 98-100% by weight of ethylenically unsaturated monomers A, it being possible for up to 20% by weight of the monomers A to comprise glycidyl and/or hydroxyl groups and/or amino/amido groups, and the polymer comprising, incorporated in the form of polymerized units, ≦5% by weight of an α,β-ethylenically unsaturated mono- or dicarboxylic acid and at least 1% by weight of acrylonitrile, and 0-5% by weight of a bi- or polyfunctional monomer and b) a polymer A2 which is soluble in the serum and comprises, incorporated in the form of polymerized units, 60-100% by weight of at least one α,β-ethylenically unsaturated mono- or dicarboxylic acid whose carboxyl groups can form an anhydride group, salts or mixtures thereof c) and a polyfunctional crosslinking agent or mixtures thereof d) and, if appropriate, divalent or trivalent metal ions which are added in the form of hydroxides, oxides, carbonates or bicarbonates as a binder for substrates.
Abstract:
The present invention relates to a continuous method for treating a crude phenol stream comprising methylbenzofuran and hydroxyacetone by passing the crude phenol stream through at least two reactors connected in series the reactors containing an acidic ion exchange resin, whereby the temperature in successive reactors decreases in flow direction of the phenol stream so that the temperature in the first reactor in flow direction of the phenol stream is between 100° C. and 200° C. and the temperature in the last reactor in flow direction of the phenol stream is between 50° C. and 90° C. without a thermal separation step between any of two successive reactors and to the use of this method in a process for making phenol.
Abstract:
A roofing membrane based on a bonded fibrous web coated with bitumen on both sides and consolidated with a mixture of at least one polymeric binder and an aluminum hydroxide and the use of a bonded fibrous web consolidated with a mixture of at least one polymeric binder and at least one aluminum hydroxide as a base material for a bituminized roofing membrane.
Abstract:
The present invention relates to a process for preparing phenols, in which the pH of the reaction product from the acid-catalyzed cleavage of alkylaryl hydroperoxides is set to a value of at least 8 at a temperature of at least 100° C. prior to the work-up of the product. This measure enables the content of undesirable by-products, e.g. hydroxyacetone, in the cleavage product to be significantly reduced. This procedure is particularly advantageously integrated into a process for preparing phenols by: a) acid-catalyzed cleavage of alkylaryl hydroperoxides and b) thermal after-treatment of the cleavage product from step a), with the temperature in step b) being higher than in step a) and is at least 100° C., wherein the adjustment to a pH of at least 8 is carried out after the thermal after-treatment and prior to cooling of the cleavage product.