摘要:
In a process for the microsuspension of emulsion polymerization of vinyl chloride using a polymerization apparatus equipped with an agitator the improvement where the ratio (H/D) of the effective height (H) of the apparatus to the effective inner diameter (D) of the apparatus is 4 or more.
摘要:
In a process for the microsuspension or emulsion polymerization of vinyl chloride using a polymerization apparatus equipped with an agitator the improvement where the ratio (H/D) of the effective height (H) of the apparatus to the effective inner diameter (D) of the apparatus is 4 or more.
摘要:
A U-shaped insert for a weather strip includes a plurality of segments, which are spaced apart by a predetermined interval. Adjacent pairs of the segments are attached together by a pair of coupling members. The coupling members of each pair of the segments are substantially parallel to one another. Acutely angled corners are formed by each coupling member and the segments to which it is attached. The acutely angled corners include notches, which are cylindrical and extend into the associated segment. This permits deformation of the insert, while the insert resists tensile deformation.
摘要:
The present invention is directed to a door weather strip in which the corner portions thereof are integrally formed with straight portions thereof. In order to obtain a predetermined sealing interference, the cross sectional shape of the corner portions of hollow sealing portion and the lip seal of the weather strip is arranged to be longer than that in the straight portion. Alternatively, the sealing portion is raised as to have a predetermined shape when the corners are formed. Said formed shapes are solidified by vulcanization after the weather strip has been plastic deformed before the vulcanization.
摘要:
Reclamation of vulcanized rubber is effected by a method which comprises heating powdered vulcanized rubber to a temperature for desulfurization of the rubber and, on completion of the desulfurization, quickly cooling the desulfurized rubber to a temperature at which substantially no oxidation of desulfurized rubber proceeds. This method obviates otherwise indispensable incorporation of process oil or other similar additive to the powdered vulcanized rubber for the purpose of retarding the oxidation of rubber molecules. When the reclaimed rubber obtained by this method is blended with newly supplied rubber, the resultant vulcanized rubber shows sparing degradation of physical properties.
摘要:
The present invention relates to a trim or a seal member such as an opening trim weather strip. The trim or a trim body in the seal member has a holding lip portion and modified holding lip portions. And the holding lip portion and modified holding lip portions have head portions. The head portions are made to bulge out toward a bottom wall portion at the tip ends of modified holding lip portions of the trim or the trim body of trim portion. The modified holding lip portions are formed so that projecting lengths of the head portions from the end surfaces of tip end portions of the modified holding lip portions, and the thicknesses of the head portions increase in inverse proportion to lip projecting lengths of the modified holding lip portions from an inner surface of an interior side wall portion. Alternatively, a slope inclined with respect to an extension plane of an opening-portion-side surface of a base end portion is formed at tip ends of the modified holding lip portions. The slope is formed so that the inclination angle with respect to the extension plane increases in accordance with the projecting lengths of the modified holding lip portions.
摘要:
The present invention has for its object to produce an isobutylene polymer having excellent performance characteristics by suppressing side reactions at the polymer growth termini during polymerization. The process of the present invention is to carry out a cationic polymerization of a monomer component containing isobutylene in the presence of a polymerization initiator, a catalyst, an ether compound, and an electron donor. Moreover, the process is to carry out a cationic polymerization of a monomer component containing isobutylene in the presence of a polymerization initiator, a catalyst, an ether compound, and an electron donor, and add a compound having the carbon-carbon unsaturated bond for introducing the carbon-carbon unsaturated bond into the polymer terminus.
摘要:
A die is formed with an opening having substantially the same shape as a fundamental cross-sectional shape of an extrusion member. A first core is formed with a projecting portion projecting forward beyond a front surface of the die. A movable die for changing the external shape of a sealing portion is disposed on the front surface of the die. The movable die is allowed to move between a position where a curved surface formed at the forward end thereof is kept away from the projecting portion of the first core and another position where the curved surface comes close to the projecting portion. Further, first and second movable cores are inserted in the opening of the die, these movable cores being moved forward and backward along the direction in which EPDM is extruded.
摘要:
A wiper blade comprising a thick base section consisting of a head to be inserted through a slit formed in a backing plate, a body to be extended below the backing plate and a connecting neck interconnecting the head and the body; a turning section having a substantially triangular cross section; a neck section interconnecting the base section and the turning section; and a lip section extended from the ridge of the turning section in the form of a thin strip for wiping the surface of a windshield, wherein at least the surface layer of at least either the connecting neck or the neck section is formed of an ozone-resistant rubber.
摘要:
An annular spacer to be used, during the vulcanization in a metal mold of an unvulcanized rubber hose having a mandrel pierced therethrough, as fitted around the mandrel in intimate contact with either of the opposite ends of the aforementioned unvulcanized rubber hose. This annular spacer has an outside diameter greater than the inside diameter of the depression in the aforementioned metal mold and an inside diameter enough for the spacer to be inserted around the aforementioned mandrel, contains in the periphery thereof a plurality of grooves formed in the axial direction of the spacer, and is made of a material softer than the materials of the aforementioned metal mold and mandrel. By the use of such spacers of this invention having the aforementioned characteristics, therefore, rubber hoses of a fixed outside diameter can be manufactured in any desired length in one and the same metal mold.