摘要:
An emulsion composition of a modified polypropylene. It can have exceedingly improved emulsion stability because the modified polypropylene used has extremely high solubility in solvents and is easily emulsifiable. The modified-polypropylene emulsion composition comprises water and a modified polypropylene dispersed and emulsified therein, and is characterized in that the modified polypropylene has a racemic diad content [r] of 0.12 to 0.88 and has hydrophilic functional groups in a number of 0.5 or larger on the average per molecular chain of the polypropylene.
摘要:
A method for producing a modified polyolefin solution, which can reduce polymer loss, solvent loss and further number of steps, and thus has excellent productivity and economic efficiency in a series of steps, wherein an α-olefin is polymerized to obtain a polyolefin, followed by modification with a modifying agent to produce a modified polyolefin solution, characterized by comprising a step wherein an α-olefin is polymerized in the presence of polymerization catalyst in liquid phase to obtain a polyolefin as a polymer solution or slurry state and a step wherein thus obtained polymer is reacted with a modifying agent to modify a polyolefin, and in that the polymer is not isolated, not recovered, nor substantially dried, in a method for producing a modified polyolefin solution by modification, using a modification agent, of a polyolefin obtained by polymerization of an α-olefin.
摘要:
A modified polypropylene which is a polypropylene having a value of racemic diad fraction [r] in a specific range and modified with a specific compound, e.g., (meth)acrylic acids, and their derivatives or styrene derivatives to have well-balanced properties of affinity for polypropylene-based materials, thermal stability, and high solubility in organic solvents; and a process for producing same. More particularly, the modified polypropylene which is a polypropylene having a value of racemic diad fraction [r] of 0.51 to 0.88, determined by 13C-NMR analysis, and chemically modified with a compound serving as a modifier, e.g., (meth)acrylic acids, and their derivatives or styrene derivatives; and the process for producing the modified polypropylene, wherein the polypropylene having a value of racemic diad fraction [r] in the above range is reacted with at least one type of the compound serving as the modifier in the presence of a radical initiator.
摘要:
A catalyst for the polymerization of olefines comprises a solid catalytic component obtained by pre-polymerizing propylene in the presence of (A) a solid component containing magnesium, titanium, halogen and an electron-donating compound, (B) an organoaluminum compound, and (C) an alkylalkoxysilane represented by the formula, R.sup.1 Si(OR.sup.2)(OCH.sub.3).sub.2, wherein R.sup.1 represents a branched or cyclic alkyl group having 3 to 6 carbon atoms, and R.sup.2 represents a branched alkyl, alkenyl or alkinyl group having 3 to 6 carbon atoms; (B) an organoaluminum compound; and (D) an alkyltrialkoxysilane represented by the formula, R.sup.3 Si(OR.sup.4).sub.2 (OCH.sub.3), wherein R.sup.3 represents a linear alkyl group having 3 to 6 carbon atoms, and R.sup.4 represents a branched alkyl, alkenyl or alkinyl group having 3 to 5 carbon atoms.
摘要:
Novel silane compound, alkoxy cyclopentyl dimethoxysilane, is prepared by reacting cyclopentyl trihalosilane with ROH and then with methanol, or by reacting cyclopentyl trimethoxysilane with ROH, wherein alkyl in the alkoxy or R in ROH stands for an organic group selected from the group consisting of sec-butyl, tert-amyl, cyclopentyl, oxa-3-cyclopentyl, cyclohexyl and 2-isopropyl-5-methyl cyclohexyl groups. The silane compounds are useful as a catalytic component for olefin polymerization and as a silane coupling agent.
摘要:
There is provided a novel silane compound, di-sec-butoxy-n-propyl methoxysilane. The aforesaid silane compound is prepared by reacting n-propyl trihalosilane with sec-butanol and then reacting a resultant reaction product with methanol.
摘要:
Diene modified polymers are provided as well as methods for preparing the same. The polymers have from 3-8 carbon atoms, from about 0.00005 to about 5 mole percent diene based on the total weight of the polymer. The polymers are essentially gel-free and exhibit enhanced melt strength and shear thinning behavior.
摘要:
A control system for operating two engines (3, 4) is installed on a construction machine, such as a hydraulic shovel, to provide for the operation of either engine or both of the engines, to improve operability and to reduce the stress on the operator. The control system has a governor controller (5, 6) for each engine, a dial potentiometer (1) for providing a throttle signal representing the desired revolution rates of the engines from a low speed to a high speed, and a selector switch (2) having a plurality of control positions (F, N and R) for selecting an individual engine or a combination of the engines. In a first control position (F), the selector switch (2) connects the dial potentiometer (1) to only the governor controller (5) of the first engine (3); in the second control position (N), the selector switch (2) connects the dial potentiometer (1) to the governor controllers (5 and 6) of both engines (3 and 4); and in the third control position (R), the selector switch (2) connects the dial potentiometer (1) to only the governor controller (6) of the second engine (3). The selector switch circuit can employ a relay (Re) to actuate relay switches (Re.sub.1, Re.sub.2) to provide the desired switching.
摘要:
Only snapshot data necessary for monitoring faults are collected from machine such as vehicles, allowing faults to be more accurately monitored, and the amount of data and the memory storage volume at a monitoring station to be reduced. The values of a plurality of (A), (B), (C), and (D) operating parameters (engine rotational speed, lever operating position, vehicle speed, and tractive force) which change during the operation of the machine are sequentially detected for each machine. The fault detection history data are thus updated every time a fault (drop in engine oil pressure, overheating) is detected during the operation of the machine. Thus, when a fault (drop in engine oil pressure) is detected during the operation of the machine, it is determined on the basis of the history data whether or not to send to the monitoring station the sequential values of the operating parameters ((A) engine rotational speed, (B) lever operating position, (C) vehicle speed, (D) tractive force) from within a prescribed period of time (from 10 min. before to 5 min. after) around the point in time t0 at which the fault was detected. When it is determined that they should be sent, the type of detected fault (0001 (drop in engine oil pressure)), the values detected ((A) 2, (B) 3, (C) 3, (D) 2) at the time the fault was detected, as well as the sequential values of the operating parameters from within a prescribed period of time (from 10 min. before to 5 min. after) around the time the fault was detected are transmitted to the monitoring station. When it is determined that they should not be sent, on the other hand, the type of detected fault (0001 (drop in engine oil pressure)) and the values detected ((A) 2, (B) 3, (C) 3, (D) 2) at the time the fault was detected are sent to the monitoring station.
摘要:
A workload detecting system for an excavating and loading apparatus, in which a bucket supporting member is vertically pivoted relative to a vehicle body and a bucket is actuated to be tilted with respect to the bucket supporting member. The system includes a bottom pressure detecting system (17) for detecting a bottom pressure of a cylinder (6) for vertically pivoting the bucket supporting member (5, 7), a, bucket earth and sand amount calculating system (18) for calculating an earth and sand weight within the bucket (9) on the basis of the detected bottom pressure, and a bucket earth and sand amount calculating summing system (31) for integrating the calculated bucket earth and sand weight.