摘要:
Process for the preparation of homopolymers or copolymers by homopolymerization or copolymerization of free-radically polymerizable water-soluble and/or water-dispersible monomers, optionally with further comonomers and optionally with at least one crosslinker, in an inverse emulsion polymerization in the presence of at least one redox initiator pair comprising an oxidizing agent and a reducing agent, where the reducing agent is 2-hydroxy-2-sulfinatoacetic acid and/or salt thereof; homopolymers or copolymers preparable by the process according to the invention, water-in-oil emulsions which comprise at least one homopolymer or copolymer according to the invention, solid compositions which comprise at least one homopolymer or copolymer according to the invention, the use of 2-hydroxy-2-sulfinatoacetic acid and/or salt thereof as reducing agent in a process for the preparation of homopolymers or copolymers; the use of the water-in-oil emulsion comprising at least one homopolymer or copolymer according to the invention for the thickening of aqueous solutions, and the use of 2-hydroxy-2-sulfinatoacetic acid and/or salt thereof as reducing component of a redox initiator pair comprising an oxidizing agent and a reducing agent for avoiding induction times during inverse emulsion polymerization.
摘要:
To check the bit-distortion ratio of a transmission line carrying bipolar PCM signals, converted from a binary to a balanced ternary code at the tramsmitting end and reconverted into binary signals at the receiving end, binary test words and identical reference words are simultaneously read out from storage at opposite ends of the line. The test words are converted into bipolar form, for transmission, and the received pulses are distributed according to polarity over a first pair of leads while the binary pulses of the reference words are distributed over a second pair of leads according to the conversion code used at the transmitting end. The pulse trains on corresponding leads are compared, bit by bit, in a deviation monitor whose output, in response to any mismatch, advances a reversible counter which is reverse-stepped by timing pulses of a cadence reduced by a frequency divider to a fraction of the bit rate. If the error rate exceeds that fraction of the bit rate, the counter reaches an alarm position in which it emits an enabling signal allowing a polarity comparator to switch the local pulse distributors while letting a polarity-independent pattern comparator arrest the readout of reference words until the patterns of energization of the two pairs of leads are again identical.
摘要:
A process for treating pigments in particulate form, comprising the following steps a) mixing pigment in particulate form with at least one nonionic surface-active substance, b) dispersing the thus obtainable mixture of pigment in particulate form and nonionic surface-active substance in an aqueous medium, c) addition polymerizing at least one first monomer or addition copolymerizing a first mixture of comonomers in the presence of a dispersion obtained after b) to form water-insoluble polymer or copolymer at the surface of the pigments in particulate form, d) adding at least one second monomer or a second mixture of comonomers and addition polymerizing or copolymerizing.
摘要:
A method of and a circuit arrangement for detecting synchronization of two word sequences between a measurement signal and a reference signal. The signals are applied to an exclusive OR-gate comparator whose output produces an error signal which is compared with an error signal shifted by one period. This comparison is effected by an exclusive OR-gate and in the case of coincidence, indicating that the measurement and reference signals are phase-shifted, a new synchronization is enabled. The output of the exclusive OR-gate is an error signal which is time-shifted in a shift register and multiplexer so that the time shifted bit sequence is compared with the bit sequence of the first error signal in a second exclusive OR-gate which is connected to an AND-gate for detecting coincidence and generating a further synchronization signal which is processed through counters, another AND-gate and a flip-flop to produce the synchronization signal which is applied to the reference pattern generated.
摘要:
A process for generating raised textures on a substrate, in which a printing or coating composition comprising a film-forming polymeric binder, a solvent, heat-expandable polymer particles, and, where appropriate, other usual additives is applied to the substrate by printing or coating, and the printed or coated substrate is heat-treated, which comprises using expandable polymer particles which are colored or colorless expandable polystyrene beads whose diameter in the unexpanded state is from 0.1 to 5 mm.