摘要:
The invention relates to a process for the production of poly-(1,4-benzamide) in admixture with SiO.sub.2 by polycondensation of 4-aminobenzoic acid in the presence of SiCl.sub.4 in 1,3-dimethyltetrahydro-2(1H)-pyrimidinone in the presence of salts, such as lithium chloride or calcium chloride.
摘要:
In a compressed-air weapon, for the simplification of original production and repair and for the simplification of stockholding it is proposed that the trigger, the counter-hook-engagement system, the trigger return spring and the trigger safety catch system if provided are combined into one prefabricated construction unit which can be united as a whole with the cylinder tube and the stock.
摘要:
Polyaryl ether ketones are prepared by electrophilic polycondensation using acyl halides as monomer components in the presence of a Lewis acid, by a process in which from 0.001 to 60% by weight of an inert filler or of a component which can be converted into an inert filler during working up are added to the reaction mixture before or during the polycondensation.
摘要:
A compressed gas weapon (10) is configured in the breech portion (18) of its barrel (12) to accommodate a projectile (24) in a position of readiness to fire and to reproducibly caliber the projectile (24) in the process of conveying it into the position of readiness to fire.
摘要:
Block copolyesters based on polyalkylene terephthalates which contain polyene blocks show an extremely low deformation even when they are processed into thin articles. They still have a crystallinity which is decreased by less than the ratio corresponding to the polyene portion.
摘要:
An ophthalmologic implant for the prophylaxis or treatment of capsule opacification after implantation and completion of wound healing of a synthetic lens is described. This treatment can be repeated if necessary.
摘要:
The device for firing a diabolo form bullet from a firearm with a rifled barrel consists of a cartridge having a housing, a detonation cap connected to one end of the housing in a gas-tight manner and containing a gas-forming propellant, the housing having an expansion compartment for expansion of a gas produced on ignition of the gas-forming propellant and an outer surface tapered toward another end of the housing remote from the detonation cap, the tapered outer surface aligning the diabolo form bullet loaded coaxially in the rifled barrel by engaging a tapered recess provided in the diabolo form bullet, whereby the diabolo form bullet is forced into the rifled barrel so as to calibrate the diabolo form bullet; and a membrane covering the other end of the housing remote from the detonation cap. The housing is provided with at least one breakthrough region, which ruptures when a gas pressure on ignition exceeds a predetermined maximum value.
摘要:
Vinylene copolymers composed of recurrent structural units of formula I ##STR1## wherein Ar denotes an aromatic or heterocyclic group, R denotes an inert substituent and n stands for an integer with a value from 0-8 and processes for their preparation.
摘要:
This invention relates to new aromatic polyesters based on substituted 4,4'-biphenyl dicarboxylic acids and substituted hydroquinones, to a process for their preparation from hydroquinone derivatives and terephthalic acid and to their use for the preparation of molecularly reinforced polymers.