摘要:
Disclosed is a composition comprised of n-propyl bromide and 1,1,1,3,3-pentafluorobutane. This invention also relates to cleaning solvent systems comprised of n-propyl bromide and 1,1,1,3,3-pentafluorobutane and methods for cleaning various solid substrates.
摘要:
Dialkyl diamines for use with polyols and polyisocyanates in cast elastomer and reaction injection molding polyurethane processes. The dialkyl diamines are prepared by nitration and reduction of dialkylbenzenes or alkylation of meta-phenylenediamine. The chain extenders have the following structure: ##STR1## where R.sub.1 is C.sub.1 -C.sub.6 alkyl or C.sub.3 -C.sub.6 cycloalkyl and R.sub.2 is C.sub.2 -C.sub.6 alkyl or C.sub.3 -C.sub.6 cycloalkyl.Contrary to the teachings of the prior art the novel diamines have surprisingly good reaction times to form polyurethanes with excellent physical properties. Furthermore, little or no mold release is required in RIM and other processes using the chain extenders of the invention.
摘要:
When certain weight ratios of certain flammable additive components (an ether and an epoxyalkane) are blended in n-propyl bromide, the components can actually function as flame retardants or flame suppressants when the resulting cleaning composition is used in aerosol applications. The proportions of the additives used are small; yet suitably effective stabilization against metallic corrosion is achieved even at mildly elevated temperatures.
摘要:
Silver tarnishing is inhibited when using ether stabilized, n-propyl bromide based cleaning compositions by including a saturated aliphatic alcohol in the compositions.
摘要:
Hydrogenated dimers of C.sub.12-18 alpha olefins (e.g. 1-tetradecene) made using a Friedel-Crafts catalyst (e.g. BF.sub.3 promoted with water) have low pour points, low volatility and viscosities which make them suitable as crankcase lubricants for internal combustion engines.
摘要:
A cleaning process suitable for both mild and aggressive applications employs non-flammable, non-corrosive and environmentally friendly, fluorinated hydrobromocarbon solvent based cleaning compositions.
摘要:
A process for cleaning movie film, and especially cellulose acetate based polymer film, without causing film damage, comprises immersing the film into a cleaning solvent composition which comprises one or more halogenated hydrobromocarbons having from 1 to 3 carbons, from 1 to 3 bromine atoms and at least one chlorine or fluorine atom, such as 3-bromo-1,1,1-trifluoropropane, removing the film from the solvent and drying the film.
摘要:
Olefin oligomers having a lower pour point are obtained by forming a mixture of C.sub.8-18 olefins containing 50-90 weight percent .alpha.-olefins and 10-50 weight percent internal olefins and oligomerizing this mixture using a Friedel Crafts catalyst (e.g. BF.sub.3) and a promoter (e.g. n-butanol). The mixture of olefins can be formed from .alpha.-olefins (e.g. 1-decene) by subjecting the .alpha.-olefins to isomerization until 10-50 weight percent of the olefins are internal olefins.
摘要:
Friction of internal combustion engines is reduced by using a formulated motor oil in the engine crankcase which contains a minor amount of an N-hydroxymethyl aliphatic hydrocarbylamide, e.g. N-hydroxymethyl oleamide. The additive can also be used in fuel.
摘要:
Silver tarnishing is inhibited when using ether stabilized, n-propyl bromide based cleaning compositions by including a small amount of an acetylenic compound in the compositions.