摘要:
A novel process is disclosed for making a functional polymer whose backbone comprises units of the formula
In this process, a chloromethylated vinylaromatic polymer (e.g. chloromethylated polystyrene) is reacted with an alkali metal hydrosulfide in the presence of a catalytic amount of an organic quaternary onium compound (e.g. tetrabutylammonium bisulfate).
摘要:
A cross-linked polystyrene resin modified by the presence therein of chemically bound sulfur provides a highly selective sorbent for removal of heavy metal contaminants from liquids containing the same.
摘要:
An oligomer vulcanizing agent and products made therefrom are described herein. The oligomer composition has the following formula:
WHEREIN R1, R2, R3, R4 and R5 can each be selected from the lower alkyl group having 1 to 10 carbon atoms and x can range between 1 and 7, and n can range between 0.5 and 15.
摘要:
A method of curing organolithium-initiated mercaptotelechelic polymers which involves esterifying the mercapto groups of the polymer to prevent spontaneous gelling of the polymer and subsequently converting the ester form to the mercapto form which is then cured.
摘要:
Novel essentially non-ionogenic, macroreticular, waterinsoluble, cross-linked polymers, having utility as adsorbent resins in the decolorization of effluents containing waste dyestuffs are disclosed. These polymers are based on an aromatic, monovinyl compound, cross-linked by copolymerization with an aromatic polyvinyl compound, the polymer containing sulfinyl substituents on the aromatic nucleii.
摘要:
IMIDES SUCH AS N-(MORPHOLINOTHIO)PHTHALIMIDE ARE USED TO EFFECT THE VULCANIZATION CHARACTERISTICS OF SULFUR VULCANIZABLE POLYMERS BY INCREASING THE STATE OF VULCANIZATION AND/OR IMPROVING SCORCH RESISTANCE AND/OR CREASING THE RATE OF VULCANIZATION.
摘要:
A class of 2-aminobenzoazoles is described which is used with primary accelerators to enhance the vulcanization rate of rubber. The new vulcanization activators are characterized by the formula
IN WHICH Y is oxygen or sulfur, X is hydrogen, alkyl, alkoxy, nitro, halo or hydroxy, and n is one or two; when n is one R is hydrogen, alkyl, aryl, cycloalkyl, aralkyl, hydroxyalkyl, or alkenyl; when n is two R is alkylene. The conjoint use of the new activators with thiazole accelerators is particularly advantageous since the vulcanization rate is increased without affecting the processing safety of the vulcanizable composition.
摘要:
CYANOISOTHIAZOLYL BIS (DITHIOCARBAMATES) OF THE FORMULA
R1-N(-R)-C(=S)-(S)X-C C(-CN)=)
WHEREIN R AND R'' INDIVIDUALLY ARE ALKYL, CYCLOALKYL, OR ARYL, AND R AND R'' TOGETHER WITH THE NITROGEN ATOM FORM A HETEROCYCLE, AND X IS 1 OR 2 WHICH ARE USEFUL FOR ACCELERATING THE VULCANIZATION OF RUBBER.
摘要:
VULCANIZATES OF HOMO- AND COPOLYMERS OF CONJUGATED DIENES WITH IMPROVED HEAT-AGING CHARACTERISTICS ARE PRODUCED EMPLOYING A VULCANIZATION SYSTEM WHICH COMPRISES AN ORGANIC DITHIOL, E.G., DODECANE-1,12-DITHIOL, A VULCANIZATION ACCELERATOR, AND SULFUR.