摘要:
A graft copolymer, comprising a trunk polymer comprising a vinyl chloride/vinyl alcohol copolymer containing vinyl chloride and vinyl alcohol as the essential constituent monomer units, and a branch polymer comprising an organopolysiloxane grafted onto said trunk polymer, and a coating composition comprising said graft copolymer as the main component. The coating formed from the composition is excellent in slippage, water repellency and mold release properties in addition to good characteristics derived from the vinyl chloride/vinyl alcohol resin.
摘要:
An electrophoretic gel comprising at least one crosslinked temperature-responsive polymeric compound having an LCST is disclosed. A method of separating and recovering substances involves conducting the electrophoresis of a sample containing substances to be separated using the electrophoretic gel at a temperature below the LCST, excising each portion of the gel containing the substance to be separated and raising the temperature of the excised portion to a temperature above the LCST to shrink the excised portion to recover the substances.
摘要:
A polylactone-modified organopolysiloxane compound, wherein a polylactone-containing group represented by the formula (I) is bound to a silicon atom located at at least either of the terminal positions and/or intermediate positions to impart excellent properties as a synthetic resin modifier (when Y in (I) is an acetyl group or a hydrogen atom) or as a film former (when Y in (I) is a hydrogen atom): ##STR1## wherein Z represents a trivalent hydrocarbon residue which may contain oxygen, sulfur or/and nitrogen atom(s); X represents a lactone group of the formula, ##STR2## (wherein R represents a hydrogen atom or an alkyl group containing from 1 to 12 carbon atoms; a represents an integer from 4 to 6), k and L each represents an integer of 1 or more; and Y represents a hydrogen atom or an acetyl group.
摘要:
A circumferential flow type fuel pump has an impeller rotated by engagement between a hole in the impeller and a rotating shaft having a diameter smaller than that of the hole. The center ofthe hole is eccentric with respect to the center of the impeller in accordance with the difference between the diameter of the hole and the diameter in section of the rotating shaft, so that the center of the impeller coincides with the center of the rotating shaft during rotation of the impeller.
摘要:
Disclosed is a method of manufacturing solvent-soluble polyorganosilsesquioxanes of the formula; ##STR1## wherein each R is a substituted or unsubstituted alkyl, alkenyl or halogen-substituted alkyl group of 1-5 carbon atoms, or substituted or unsubstituted phenyl of 6-10 carbon atoms, and n is 2-10,000; which comprises reacting an organotriacetoxysilane with a stoichiometric quantity of alcohol and/or water in an organic solvent to obtain a diacetoxymonoalkoxysilane, which is condensation polymerized in the presence of sodium hydrogencarbonate to obtain a prepolymer, which prepolymer is then condensation polymerized by heat in the presence of a catalyst selected from alkali metal hydroxides, alkaline earth metal hydroxides, alkali metal fluorides, alkaline earth metal fluorides and triethylamine.
摘要:
An oligomeric cage-like poly(silsesquioxane) of the general formula ##STR1## in which R is a monovalent hydrocarbon group and m is 4 to 12, can be polymerized by being admixed with a catalyst, e.g. alkali hydroxide or fluoride, and irradiated with microwaves. Different from conventional method of thermal polymerization, the polymerization reaction proceeds very uniformly at a high velocity to give a polymer of a high average molecular weight and narrow molecular weight distribution.
摘要:
A synthetic resin modifier comprising an organopolysiloxane represented by General Formula (I): ##STR1## wherein the group represented by X consists of 2 to 40% by weight of a group represented by R.sup.1 CO--, wherein R.sup.1 represents a saturated or unsaturated monovalent hydrocarbon group having 7 to 21 carbon atoms, and 60 to 98% by weight of a group represented by R.sup.2 --O-C.sub.q H.sub.2q), wherein R.sup.2 represents a saturated or unsaturated monovalent hydrocarbon group having 7 to 21 carbon atoms.This modifier can be effective for any type of synthetic resins, imparting good lubricity and release properties to the surface of forms or molding products, including films, and improving the workability in the molding of synthetic resins.
摘要:
The inventive method for forming a cured film on a substrate surface comprises coating the surface with a room temperature curable organosiloxazane polymer comprising, in a molecule, (a) at least one organosiloxane unit represented by the unit formula (a) at least one organosiloxane unit represented by the unit formulaR.sup.1.sub.a SiO.sub.(4-a)/2,and (b) at least one organosilazane unit represented by the unit formulaR.sup.2.sub.b Si(NR.sup.3).sub.(4-b)/2,in which R.sup.1, R.sup.2 and R.sup.3 are each a hydrogen atom or a substituted or unsubstituted monovalent hydrocarbon group, not all of them being simultaneously hydrogen atoms, and the subscripts a and b are each a positive integer of 1, 2 or 3 with the proviso that a and b cannot be simultaneously equal to 3, in a molecule and subjecting the coating film to exposure to a moisture-containing atmosphere. The method is useful for forming a surface-protecting film or for imparting surface releasability.
摘要:
A slide fastener is sewn to a pair of fabric pieces in a sewing station defined by a double-needle sewing machine. A pair of fastener stringers is twisted around in mirror symmetry with respect to the longitudinal centerline of the slide fastener. A slider, which is slidable on and along the fastener stringers, is temporarily held by a slider holder disposed upstream of and adjacent to the sewing station. As the sewing operation progresses and until after the engagement of the slider with the bottom end portion of the slide fastener, the pair of fastener stringers are automatically progressively uncoupled. The further movement of the slide fastener causes the slider to be forced by the bottom end portion of the slide fastener past the slider holder.
摘要:
An apparatus for sewing a slide fastener to a pair of fabric pieces is provided with a slider-moving unit for coupling a pair of opposed stringers of the slide fastener immediately after the opposed stringers have been sewn to the respective fabric pieces. The slider-moving unit includes a slider-holding mechanism disposed downstream of a sewing station and reciprocable for pulling a slider on the slide fastener away from the sewing station, and a brake disposed adjacent to an upstream end of the reciprocating movement of the slider-holding mechanism for retaining a bottom end of the slide fastener while the slider is being pulled by the slider-holding mechanism.