摘要:
A process for purifying crude polyether polyols which are prepared by anionic polymerization of alkylene oxides in the presence of basic catalysts. The polyols are mixed with water and ortho-phosphoric acid in certain quantity ratios, an adsorption agent is incorporated in the reaction mixture, the mixture is filtered and the water is removed from the polyether polyol by distillation.
摘要:
A process for the manufacture of improved magnetic discs by applying a thin layer of a fluid dispersion of magnetic pigments and optional non-magnetic pigments in a binder mixture to a non-magnetic rigid base and curing the magnetic layer which has been applied. The binder consists essentially of from 60 to 90 percent by weight of a solid curable polycondensate of 2,2-bis-(4-hydroxyphenyl)-propane and epichlorohydrin having an epoxide equivalent weight of approximately 400 to 5,000, from 5 to 25 percent by weight of a curable allyloxybenzene-formaldehyde condensate of the resol type with free or alcohol-etherified methylol groups and a molecular weight of less thah 1,000, and from 5 to 30 percent by weight of a curable melamine-formaldehyde condensate with more than two alcohol-etherified methylol groups and a molecular weight of less than 3,000, from 10 to 35 percent by weight of the above epoxy resin being replaced by a reaction product of an epoxy group-containing polycondensate of 2,2-bis-(4-hydroxyphenyl)-propane and epichlorohydrin with the N-methylolamide of a copolymerizable olefinically unsaturated carboxylic acid of 3 to 5 carbon atoms. The magnetic layers thus produced adhere firmly to the base, can be readily ground and polished and are particularly resistant to wear when the magnetic discs are in use.
摘要:
A method for producing a heat-sensitive recording material comprises: preparing a first coating composition, which includes as color acceptor 4,4′-dihydroxydiphenyl sulfone, at least one sensitizer selected from the list of methylolstearamide, stearic acid amide, and dimethyl terephtalate; preparing a second coating composition, which includes: from 65 to 95% by weight of one or more (meth)acrylate from 0 to 20% by weight of photoinitiators and from 0.5 to 20% by weight of wax; applying the prepared first coating composition to form the heat-sensitive recording layer on the front side of the substrate; drying the first coating composition; applying the second coating composition to form the protective layer covering the heat-sensitive recording layer; crosslinking the protective layer covering the heat-sensitive recording layer; applying the second coating composition to form the coating on the back side of the substrate; crosslinking the coating.
摘要:
Use of a neurotoxic component of a Clostridium botulinum toxin complex for the facial cosmetic treatment of a human or animal susceptible to suffering from doll's face or frozen face, or the neurotoxic component of a Clostridium botulinum toxin complex for the treatment of a disease or disorder caused by or associated with hyperactive cholinergic innervation of muscles or exocrine glands in a human or animal susceptible to side effects associated with the treatment of said disease or disorder with a Clostridium botulinum toxin complex:
摘要:
The invention relates to a heat-sensitive recording sheet comprising a substrate, a heat-sensitive recording layer and a protective layer which is provided on the recording layer and which contains pigment. At least 80 wt. % of the pigment of the protective layer is formed from a highly purified bentonite treated with alkaline, the bonding agent of the protective layer consists of a water-insoluble, self-crosslinking acryl polymer, the bonding agent/pigment ratio is between 7:1 and 9:1, the crosslinking agent/bonding agent ratio is higher than 1:5, and the protective layer comprises Bekk smoothness of at least 900 seconds.
摘要:
The invention relates to a process for the preparation of elastomeric molded parts having urethane or urethane and urea linkages which comprises reacting(a) an organic polyisocyanate,(b) a polyhydroxyl compound selected from the group consisting of(i) polyester polyols with molecular weights of 1000 to 3000 and hydroxyl numbers of 170 to 35 produced by polycondensation of organic dicarboxylic acids and a polyol mixture of at least 3 polyols;(ii) polyether polyols having terminal ester groups, molecular weights of 1000 to 8000 and hydroxyl numbers of 170 to 15; and(iii) mixtures thereof;(c) a chain extenderwherein components (a) through (c) are processed according to reaction injection molding techniques in open or closed molds.The reaction is preferably carried out as a one-shot process and may also be carried out in the presence of blowing agents (d), auxiliaries (e), and additives (e).The non-cellular and/or microcellular elastomeric molded parts produced according to the method of this invention are particularly well suited for use in the automobile industry, for example, as bumper covers and body parts such as fenders, spoilers, wheel well expansions as well as engineering housing parts and runners. The cellular foams are used, for example, as shoe soles, armrests, headrests, safety coverings in the passenger compartment in automobiles as well as motorcycle and bicycle seats, seat cushions and cover layers in composite foams.
摘要:
This invention relates to a process for the manufacture of stable polyol-filler dispersions. The polyol-filler dispersions are prepared by the crushing of fillers in situ in polyols employing high localized energies.
摘要:
This invention relates to a process for preparing cellular polymers having urethane groups, isocyanurate groups, or both. The cellular polymers are prepared by reacting an organic polyisocyanate with certain polymer dispersions in the presence of a blowing agent.The polymer dispersions comprise(a) as a continuous phase, a polyol having a functionality of 2 to 8 and a hydroxyl number of 150 to 700; and(b) as a dispersed phase, an organic compound having(a) at least one Zerewitinoff active hydrogen atom,(b) a melting point of 30.degree. C. to 260.degree. C., and(c) a molecular weight of 178 to 100,000.
摘要:
Stable melamine-polyoxyalkylene polyether polyol dispersions are prepared by the in situ reduction of melamine particles wherein 90 percent of the melamine particles have a particle size of less than 10 microns. Stabilizers for the melamine-polyol dispersion are selected from the group consisting of(a) silicic acids and silicates,(b) salts of perfluorinated alkyl carboxylic acids having 4 to 20 carbon atoms, salts of alkyl sulfonic acids and perfluorinated alkylsulfonic acids having 4 to 20 carbon atoms and polyperfluoroether polyols having molecular weights of 300 to 6000, and(c) salts of fatty alcohol sulfates having 6 to 30 carbon atoms.These dispersions are useful for the preparation of polyurethane foams.
摘要:
The invention relates to a process for the manufacture of reinforced polyurethane foams based on the reaction of organic polyisocyanates and polyols in the presence of filler dispersions. These dispersions are prepared by in situ crushing of the filler in the polyisocyanate or polyol to a particle size of less than 7 microns.