Abstract:
Polyvinylchloride or chlorinated polyvinylchloride polymer article reinforced with glass fibers coated with vinyl chloridevinyl trialkoxysilane copolymers in an amount effective to increase the strength characteristics of the article. The copolymer can include at least one of carboxylic acid vinyl esters, unsaturated mono- or dicarboxylic acid esters, and alkyl vinyl ethers.
Abstract:
A process for the preparation of ''''Gudol powder'''' from a mixture of nitrocellulose, diglycol dinitrate, nitroguanidine, and additives, wherein an aqueous raw mixture of nitrocellulose and diglycol dinitrate is premixed with the other components, the said final mixture then dehydrated in part, plasticized, and finally pressed into the final shape of the powder product. The improvement in the process comprises reducing the water content of the premixed components in a first drying stage, then homogenizing and preplasticizing the premixed components in a continuously operating masticator, thereafter further reducing the water content of the composition in a second drying stage, thereupon plasticizing and converting the composition into granular form in a continuously operating extruder, adjusting the moisture control of the granulated material to a required pressing or extruding moisture, and finally extruding the granulated material to the final shape of the powder product in a continuously operating extruder.
Abstract:
A device for mixing curable liquid materials which comprises a mixing vessel, a mixer shaft disposed in the mixing vessel and extending through an opening in one end of said vessel, inlet means for introducing the components for forming a curable liquid material into the vessel, outlet means for discharging the resultant mixture therefrom, one of the components being a liquid component which cannot be cured without additives, and means for subdividing the vessel into two mixing chambers in communication with each other in such a manner that the opening is not blocked with the curable mixture.
Abstract:
As an improved flame-resistant agent, pentabromodiphenyl ether and mixtures of pentabromodiphenyl ether and brominated diphenyl ethers; an agent for impregnating a mass of particles which comprises an impregnating agent, pentabromodiphenyl ether, preferably together with a plasticizer; a laminate substrate comprising a web of fibers impregnated with an impregnating agent and pentabromodiphenyl ether, said web preferably containing a plasticizer; a method of increasing the flame resistance of a continuous web impregnated with an impregnating agent which comprises including in said web pentabromodiphenyl ether.
Abstract:
A caseless formed propellant powder charge including a shaped propellant powder charge having a central continuous recess or hole and a percussion-sensitive primer charge with an H-shaped cross section disposed in the recess. Preferably, the shaped propellant charge and the primer charge are fabricated from materials such as nitrocellulose, polyvinyl nitrate, nitroguanidine, penthrite, or mixtures thereof, and tetrazene or tetrazene tricinate, respectively. The compression and dimensioning of the various portions of the H-shaped primer charge may be modified to achieve the desired sensitivity.
Abstract:
A rocket motor having at least two coaxial combustion chambers, one arranged behind the other and each containing a solid propellant charge. A partition is positioned between the first and second chamber and between each successively sets or pairs of chambers. This partition has closure means for preventing ignition of the second charge during ignition of the first and for allowing through flow due to excess pressure generated by ignition of the second propellant charge.
Abstract:
A process for the continuous manufacture of phenolic resin foam in an endless sheet which includes mixing expandable liquid phenolic resin with a blowing agent and an acid-containing curing agent, optionally with the addition of additives, and processing of the mixture in a temperature-controllable double belt press. The process also comprises cooling the phenolic resin to a temperature of from about 8* to 15*C., admixing a blowing agent under a high pressure with said resin to form a resin premix, mixing said resin premix with a curing agent resin to form a resin premix, mixing said resin premix with a curing agent and other foam additives to form a curable reaction mixture, continuously applying said mixture uniformily onto a moving substrate, covering the mixture on said substrate with a continuous protective layer, passing the covered mixture into the double belt press, and foaming the mixture under pressure until a desired sheet thickness has been obtained.
Abstract:
Dichloroacetyl chloride is prepared from trichloroethylene, including technical grades thereof, by oxidation and irradiation by short-wave light, utilizing a catalyst which is a salt of an aliphatic nitrogenous base or an ammonium salt.
Abstract:
An improvement in a process for the impregnation of masonry with an alcoholic or benzine solution of an alkyltrialkoxysilane or a partial condensation product thereof which improvement involves including in the alcoholic or benzine solution an organofunctional silane having a basic organo group or an alcoholate of an element selected from the group consisting of silicon, a metal of the First Main Group of the Periodic System, a metal of the Second Main Group of the Periodic System, a metal of the Fourth Sub-Group of the Periodic System, and a metal of the Fifth Sub-Group of the Periodic System; an improved composition for the impregnation of masonry comprising a mixture of an alkyltrialkoxysilane or a partial condensation product thereof and an organofunctional silane having a basic organo group or an alcoholate of an element selected from the group silicon, a metal of the First Main Group of the Periodic System, a metal of the Second Main Group, a metal of the Fourth Sub-Group of the Periodic System and a metal of the Fifth Sub-Group of the Periodic System.
Abstract:
A method for adhering an organic substance to a metallic or inorganic oxidic substance which comprises disposing between said organic substance and said metallic or inorganic oxidic substance a phosphorus organosilane of the general formula
WHEREIN EACH R is independently a substituted or unsubstituted aliphatic radical, each A is a bivalent alkylene or arylene radical or a bivalent oxyalkylene or oxyarylene radical joined by its oxygen to the phosphorus atom, m, n, p and x are each values of 0 or 1, B is either a bivalent oxygen radical, an -NHradical, an -NR- radical or an -S- radical when p is equal to 1 and y is equal to 1 to 20.