摘要:
Disclosed herein is a method for inhibiting the premature polymerization of ethylenically unsaturated monomers comprising adding to said monomers an effective amount of: A) at least one nitroxyl compound, and B) at least one quinone alkide compound having an electron-withdrawing group at the 7-position. Additionally, a composition is disclosed that comprises: A) at least one nitroxyl compound, and B) at least one quinone alkide compound having an electron-withdrawing group at the 7-position.
摘要:
Compositions and methods of treating a retroviral infection in an afflicted host and/or inhibiting replication of a retrovirus involve administering a therapeutically effective amount of the following compound of formula I: A-L-B (I) wherein A is a substituted or unsubstituted aryl compound, substituted or unsubstituted piperidyl, or substituted or unsubstituted thiopheneyl; L is sulfonyl, sulfinyl or thio; and B is a substituted or unsubstituted aromatic nitrogen containing heteroaryl compound; or pharmacologically acceptable acid-addition and base-addition salts thereof.
摘要:
A process for producing cured rubber is disclosed wherein the process comprises: A) mixing rubber, carbon black, and azodicarbonamide without other curative ingredients; B) adding the remaining curative ingredients in one or more subsequent mixing steps; and then C) curing the rubber; whereby a cured rubber having improved hysteresis is obtained. The cured rubber thus obtained is particularly useful in tires and tire treads.
摘要:
A poly(null-olefin) copolymer obtained from the polymerization of at least one null-olefin having from 2 to about 20 carbon atoms and at least one bulky olefin, the process comprising polymerizing the monomers in the presence of hydrogen and a catalytically effective amount of a catalyst comprising the product obtained by combining a metallocene procatalyst with a cocatalyst; lubricant compositions comprising such poly(null-olefin) copolymer; and a method for improving the viscosity index of a lubricant composition using such poly(null-olefin) copolymer.
摘要:
A process for the preparation of a poly(null-olefin) copolymer is disclosed wherein the process comprises polymerizing at least one null-olefin, preferably 1-decene, and at least one bulky olefin, preferably norbornene, in the presence of hydrogen and a catalytically effective amount of catalyst comprising the product obtained by combining a metallocene procatalyst with a cocatalyst, the metallocene procatalyst being at least one compound of general formula:(Cp1R1m)R3(Cp2R2p)MXqwherein Cp1 of ligand (Cp1R1m) and Cp2 of ligand (Cp2R2p) are the same or different cyclopentadienyl rings, R1 and R2 each is, independently, hydrogen or a hydrocarbyl, halocarbyl, heterocarbyl, hydrocarbyl-substituted organometalloid or halocarbyl-substituted organometalloid group containing up to about 20 carbon atoms, m is 0 to 5, p is 0 to 5 and two R1 and/or R2 substituents on adjacent carbon atoms of the cyclopentadienyl ring associated therewith can be joined together to form a ring containing from 4 to about 20 carbon atoms, R3 is a bridging group bridging Cp1 with Cp2, M is a transition metal having a valence of from 3 to 6, each X is a non-cyclopentadienyl ligand and is, independently, halogen or a hydrocarbyl, oxyhydrocarbyl, halocarbyl, hydrocarbyl-substituted organometalloid, oxyhydrocarbyl-substituted organometalloid or halocarbyl-substituted organometalloid group containing up to about 20 carbon atoms, and q is equal to the valence of M minus 2, the cocatalyst being an aluminoxane and it being provided that ligand (Cp1R1m) is different than ligand (Cp2R2p) and bridging group R3 contains at least two bulky groups.
摘要:
A metallocene catalyst is provided which comprises the product obtained by combining (a) a metallocene procatalyst, preferably one containing a bridging group possessing at least two bulky groups, and (b) a cation-generating cocatalyst. A process for activating a metallocene procatalyst is also provided which comprises combining the metallocene procatalyst with the components of a cation-generating cocatalyst.
摘要:
A process is disclosed for the direct preparation of alkanediol-diaminobenzoates comprising transesterifying an alkyl-p-aminobenzoate with a diol in the presence of a transesterification catalyst.
摘要:
Phenolic amides, useful as stabilizers for organic materials such as polyols and polyurethanes, possess the general formula ##STR1## wherein n is 0 to 3, R.sub.1 is alkyl of from 1 to about 6 carbon atoms, R.sub.2 is hydrogen or alkyl of from 1 to about 6 carbon atoms, R.sub.3 is hydrogen or hydrocarbyl of up to about 20 carbon atoms, optionally containing one or more heterocyclic groups, R.sub.4 is hydrocarbyl of up to about 20 carbon atoms, optionally containing one or more heterocyclic groups, or R.sub.3 and R.sub.4 together with the nitrogen atom to which they are bonded are joined together to form a heterocyclic group, optionally containing one or more additional heterocyclic atoms.
摘要:
Pesticidal substituted oxadiazines having the formula: ##STR1## wherein R is a substituted or unsubstituted heterocyclic group, pesticidal compositions containing these oxadiazines, and methods for their use.
摘要:
The invention concerns a silicone-modified EPDM modified with a freeze release additive of a fatty acid amide and/or optionally, graphite having at least 85% carbon, and compounded and co-extruded onto the surface of elastomeric sponge automotive weatherstripping thereby forming a permanent skin surface on the sponge material. The resulting material has improved and desirable freeze-release and coefficient of friction properties. These improved properties eliminate the need for currently used spray coatings, resulting in manufacturing cost savings and more durable surface.