摘要:
A process for producing an inorganic-organic composition material based on gypsum and polyurethane comprising exposing calcined gypsum or anhydrite to the action of water in the presence of a polyurethane or polyurethane-urea which is dispersible in water and in the presence of up to about 20% by weight (relative to the total mixture) of an alcohol and up to about 20% by weight (relative to the total mixture) of another organic solvent, and allowing the composition to set while permitting any solvents which may be present to evaporate. The calcium sulphate may be on a textile support or the composition may be molded into flexible shaped articles of good mechanical properties.
摘要:
Xanthogen disulphides of the following formula: ##STR1## wherein R and R.sub.1 independently represent hydrogen, C.sub.1 -C.sub.6 alkyl, C.sub.5 -C.sub.8 -cycloalkyl or an oxygen-containing heterocyclic ring system having from 5 to 8 ring members and optionally mono- or tri-substituted by C.sub.1 -C.sub.4 -alkyl, and whereinR and R.sub.1 may also be connected together to complete a hetero cyclic ring having from 3 to 6 carbon atoms and from 1 to 3 oxygen ring members, and the ring may be substituted by from 1 to 3 C.sub.1 -C.sub.4 -alkyl groups, with a content of elemental sulphur of less than 1.7% by weight, a process for their production by the reaction of a xanthic acid-O-ester-alkali metal salt of the following formula: ##STR2## wherein R and R.sub.1 are as defined in claims 1 and 3, andM represents an alkali metal, with aqueous chlorine bleach liquor, characterized in that aqueous chlorine bleach liquor having a concentration of less than 0.9 mol NaOCl/kg is used, and oxidation is carried out at a temperature of from 10.degree. to 20.degree. C. and at a pH of from 8 to 12, only until from 0.1 to 5.0 mol % of the xanthic acid-O-ester-alkali metal salt, based on the quantity used, is still present at the end of the reaction, as well as their use as molecular weight regulators in the polymerization of chloroprene.
摘要:
This invention relates to a polychloroprene elastomer distinguished by good processing properties and high tensile strength in the form of a polychloroprene mixture containing a sol polymer and a gel polymer in a ratio, by weight, of from 1:4 to 9:1, characterized in that both polymers have been produced in the presence of from 2.5 to 4.0 parts, by weight, of the potassium salt of disproportionated abietic acid (expressed as acid), from 0.3 to 1.0 part, by weight, of a condensation product of naphthalene sulphonic acid and formaldehyde and from 0.1 to 1.5 parts, by weight, of potassium hydroxide, based in each case on 100 parts, by weight, of monomer, and in that the gel polymer is a copolymer of chloroprene and from 1.5 to 2.5 mole percent, based on total monomer, of a diester corresponding to the following general formula: ##STR1## wherein R.sub.1 and R.sub.2 represent hydrogen, chlorine or C.sub.1 -C.sub.4 alkyl; andX represents C.sub.2 -C.sub.10 alkylene.
摘要:
An ionization smoke detector containing at least one ionization chamber operated at an extra low voltage or potential. The ionization chamber contains a sensor employing a measuring electrode and a counter electrode. Ambient air has practically free access to the ionization chamber and there are provided one or more radioactive sources for generating ions, a supply voltage source and an electrical circuit for triggering an alarm. The smoke detector possesses increased operational reliability since circuit elements are provided which enable signal reporting to a central station by means of a low-voltage of about 200 volts, however the sensor is operated at an extra low voltage.
摘要:
A transparent, non-stratified, three dimensional resin reinforced fibrous sheet and the process for its preparation is disclosed. A fibrous sheet is impregnated or coated with one or more tri or higher functional monomers that can be polymerized in-situ to form three dimensional polymer resins, in close contact with the fibrous material of the sheet. A transparentized fibrous sheet results which is resistant to water and alcohols, highly and evenly translucent and useful as tracing media vellum as well as a translucent base for sensitizing with reprographic coatings.
摘要:
A D.C. to D.C. voltage converter for producing a regulated, adjustable D.C. output voltage from an unregulated D.C. input voltage. An inverter produces alternating rectangular output pulses from the unregulated D.C. input, which are rectified to produce the regulated D.C. output voltage, with the timing and duration of the inverter output pulses being determined by alternating rectangular control pulses produced by a control pulse generator.The control pulse generator includes an operational amplifier having an inverting input connected to a positive D.C. reference voltage, and a non-inverting input connected to the slide connection of a potentiometer connected between the regulated positive D.C. output voltage and ground. A diode is connected between the amplifier output and ground to block current flow to ground, thus assuring that the amplifier output error signal is essentially always positive, and is only generated when the non-inverting input voltage exceeds the referenced voltage. Another operational amplifier is connected as an inverter to the output of the first amplifier to produce another equal, but negative, error signal. These two signals are combined in a threshold circuit with an alternating triangular wave voltage to produce alternating triangular pulses corresponding to the positive and negative portions of the triangular wave exceeding the positive and negative error signals. The triangular pulses are converted by a pulse shaping circuit into the alternating rectangular pulses which control the inverter switching circuits.
摘要:
Plastic pigment spheric particles which form a matrix for diazotype reproduction materials are applied to a base sheet. Whether the diazo sensitizing solution is included in admixture with spheric plastic pigment particles or is applied thereafter as a second coating, a matrix is formed having a sensitized diazo layer dispersed throughout. Such diazo matrices permit control of contrast ratios over a wide range. Also such diazo matrices are transferable. The diazo matrix image can be made water fast by an after treatment by means of a solvent. Such a matrix lends itself to the heat development process by retaining the heat generated development agents within the matrix due to its thermoplastic character. In another aspect of the invention multi-color diazo reproduction on a single base sheet employing consecutive overcoatings of the matrix and diazo sensitizing solution after each development can be achieved.
摘要:
A system by which a User can associate selectable Markers, Data Packets and/or Objects with Content. The Content may generally be distributed electronically, and the Markers allow for insertion and/or overlay of Objects when the Content is selected for viewing by a Viewer. Objects and Data Packets are generally provided by a User, Promoter, Host, Service, or other entity to convey information to a Viewer. A Service provides tools and capabilities to both the User and the Promoter to facilitate their respective actions according to embodiments of the invention, including enabling the creation of live social networks (such as those linked to a specific Service provider, a specific User group, activities by a specific Promoter, and/or to specific Data Packets) and the creation of n-dimensional Virtual Environments.
摘要:
Unified systems and methods enable control of the use and operation of a family of different treatment devices, to treat dysfunction in different regions of the body.