摘要:
Organopolysiloxanes which are crosslinked by high energy radiation consisting essentially of siloxane units of the formulas:(a) HR.sup.1 C.dbd.CR.sup.2 COOR.sup.3 SiR.sub.2 O.sub.1/2,(b) HSR.sup.4 SiRO and(c) R.sub.2.sup.5 SiOwhere R is a monovalent hydrocarbon radical or a halogenated monovalent hydrocarbon radical, R.sup.1 is hydrogen or a phenyl radical or a halogenated phenyl radical, R.sup.2 is hydrogen or an alkyl radical having from 1 to 4 carbon atoms per radical and R.sup.3 is a hydrocarbon radical or a halogenated hydrocarbon radical, R.sup.4 is a divalent hydrocarbon radical, R.sup.5 is the same as R or a hydrocarbon radical substituted with the HR.sup.1 C.dbd.CR.sup.2 COO group, where R.sup.1 and R.sup.2 are the same as above, in which two siloxane units of the formulaHR.sup.1 C.dbd.CR.sup.2 COOR.sup.3 SiR.sub.2 O.sub.1/2are present per molecule. These organopolysiloxanes are prepared by equilibrating the corresponding siloxanes in accordance with the conventional methods known in the art.These organopolysiloxanes can be crosslinked by high energy radiation, for example, ultraviolet radiation, to form coatings on paper for releasing tacky substances or as coatings on optic fibers and as photocuring sealants for electronic components.
摘要:
Organopolysiloxanes having SiC-bonded oxyalkylene units and Si-bonded hydroxyl groups, in which an average of at least 15 mol percent of the siloxane units contain only one SiC-bonded monovalent organic radical and the silicon valences which are not satisfied by the SiC-bonded monovalent organic radical are satisfied by siloxane oxygen atoms or oxygen atoms of hydroxyl groups. These organopolysiloxanes are preferably prepared by reacting triorganosiloxy end-blocked organopolysiloxanes consisting of diorganosiloxane units, in which at least part of these units contain SiC-bonded oxyalkylene units and, if appropriate, organohydrogensiloxane units or organohydroxyl siloxane units or organoalkoxysiloxane units of mixtures of at least two such monoorganosiloxy units with water in the presence of an acid or base or, and subsequently with a silane or simultaneously with water and a silane in which the silane contains one SiC-bonded monovalent organic radical, or partially hydrolyzed products of the silane. The new organopolysiloxanes are applied to textile fibers to impart hydrophilic properties thereto.
摘要:
Asymmetrical disiloxanes are prepared by reacting (a) a silane containing three SiC-bonded monovalent organic radicals in which at least one may be substituted with Si-bonded hydrogen and an SiOC-bonded monovalent organic radical with (b) a symmetrical disiloxane which is different from the disiloxane obtained from the hydrolysis of silane (a), and contains at least two identical substituents in the presence of water and an acid at a temperature of from -10.degree. to about 50.degree. C.
摘要:
A wrench having a handle with an actuating lever arm pivoted for operation to rotate a nut engaging ring geometrically configured to accept a nut or bolt head. The nut engaging ring includes two tappets extending in the plane of rotation of the lever arm. A torque applied to the lever arm engages these tappets and thereby causes the nut engaging ring to rotate with increased force.
摘要:
Organopolysiloxanes having substituted carbamoyloxy groups (.tbd.SiOCO--NH--) bonded to silicon via oxygen, which are prepared by reacting an organopolysiloxane containing Si-bonded hydroxyl groups with an organic isocyanate in the presence of an organic tin compound.The stability of the organopolysiloxanes containing carbamoyloxy groups may be improved if the organopolysiloxane having Si-bonded hydroxyl groups is reacted with an organic isocyanate in the presence of an organic tin compound which is supported on a solid carrier and then the reaction product is filtered under anhydrous conditions to remove the supported organic tin compound.
摘要:
This disclosure relates to a tool for rotating elements, such as nuts, bolts, screws or like fasteners, and includes a ring having ratchet teeth, the ring being driven by a lever, a pawl carried by the lever for engaging the ratchet teeth, a flexible tension-applying member in at least partial surrounding relationship to the ring, means for supporting the pawl, and the tension-applying member being disposed between the supporting means and the lever whereby upon movement of the lever in a first direction the pawl rotates the ring through the engagement of a tooth of the ring and the tension-applying member deforms slightly to frictionally grip the ring.
摘要:
A power wrench having at least a partially annular drive head connected at first and second pivots through a first of a pair of telescopic members and to a third member, respectively, the third member being connected by a third pivot to the second member, and upon a relative linear telescopic motion of the first and second members, the drive head is rotated through a predetermined arc under the control of the third member.