摘要:
wherein R can contain from 1 to 12 carbon atoms and is an alkyl group, an aryl group, an aralkyl group or a cycloaliphatic group, which is present in an amount substantially equal to a ratio of about 2.5 to 20 parts by weight of diethyl xanthogen disulfide per 100 parts by weight of the total monomer. The chloroprene based liquid polymer is purified by contacting the polymer or the polymer containing solution with an alcohol represented by the formula: R1OH wherein R1 is an alkyl group containing 1 to 5 carbon atoms, to remove any unreacted xanthogen disulfide compound.
A process for preparing a chloroprene based liquid polymer having active terminal groups substantially at the terminals thereof comprising polymerizing chloroprene alone or in combination with one or more monomers copolymerizable with chloroprene in (1) an organic solvent having a boiling point of about 160*C or less at atmospheric pressure and selected from the group consisting of aromatic hydrocarbons, aliphatic halogenated hydrocarbons and cyclic ethers, or (2) in carbon disulfide, which is present in an amount of about 20 to 200 parts by weight per 100 parts by weight of the total monomer, in the presence of a xanthogen disulfide compound represented by the formula:
摘要:
Polychloroprene latices having improved ''''wet strength'''' are made by polymerising chloroprene in the presence of a watersoluble salt of a mercapto organic carboxylic acid.
摘要:
A process for polymerizing 2-chlorobutadiene-1,3 in an emulsion system, said process incorporating an improved method of adding a short-stopping agent to the reaction mass to terminate the polymerization at a pre-set degree of conversion of monomer to polymer.
摘要:
POLYMERIZING CHLOROPRENE IN AN ALKALINE AQUEOUS EMULSION IN THE PRESENCE OF BOTH AN ORGANIC SULFUR-CONTACTING CHAIN TRANSFER AGENT AND BENZOTHIOZOLESULFENAMIDE.
摘要:
PROCESS FOR PRODUCING A VISCOSITY STABLE CHLOROPRENE/ SULFUR POLYMER BY POLYMERIZING IN AQUEOUS EMULSION IN THE PRESENCE OF A DIALKYL ZANTHOGEN DISULFIDE AND AN ALKALI SULFITE OR ALKALI THIOSULFATE. ALSO CHLOROPRENE/SULFUR POLYMER HAVING IMPROVED VISCOSITY STABILITY PREPARED THEREBY.
摘要:
USE OF OCTYL SULFATE SALTS AS EMULSIFYING AGENTS IN CHLOROPRENE POLYMERIZATION, OCTYL SULFATE SALTS ARE BIODEGRADABLE AND REPLACE THE NONBIODEGRADABLE SALTS OF THE CONDENSATION PRODUCT OF NAPHTHALENE SULFONIC ACIDS AND FORMALDEHYDE.
摘要:
Polymeric compositions characterized by being fiber-forming and stereospecific and capable of being melted and drawn into strong crystalline filaments and fibers. The compositions are useful as storage stable binders as well as adhesives for fluorcarbon material.
摘要:
THERE IS DISCLOED A PROCESS FOR THE HOMOPOLYMERIZATION OF AN UNSATURATED MULTICYCLIC COMPOUND CONTAINING A 3,5-DISUBSTITUTED HEXACHLOROCYCLOPENTENE MOIETY. THE COPOLYMERIZATION OF SUCH COMPOUNDS WITH CYCLIC OLEFINS IS ALSO DISCLOSED. THE POLYMERIZATIONS PROCEED VIA THE CLEAVAGE OF THE DOUBLE BOND CONTAINED IN THE CYCLIC RINGS. POLYMERS RESULTING FROM THESE POLYMERIZATIONS ARE ALSO DISCLOSED ASS COMPOSITIONS.
摘要:
PROCESS FOR PRODUCING SULPHUR-MODIFIED CHLOROPRENE POLYMERS HAVING A PREDETERMINED MOONEY VISCOSITY BY POLYMERISING CHLOROPRENE AND UP TO 20% BY WEIGHT OF A COMONOMER IN AQUEOUS EMULSION WITH A PEPTISING AGENT, WHERE COAGULATION OF THE LATEX IS EFFECTED IMMEDIATELY AFTER ADDITION OF THE PEPTISING AGENT AND THAT THE POLYMER IS DRIED UNTIL A MOONEY VISCOSITY OF 30 TO 10 MOONEY UNITS ABOVE THE POTENTIAL MINIMUM IS OBTAINED.
摘要:
REACTION PRODUCTS OF NITROUS ACID AND 1.3-DICHLOROBUTENE-2 OR DISOBUTYLENE, USEFUL AS INHIBITORS OF "POPCORN" POLYMER FORMATION IN CHLOROPRENE POLYMERIZATION REACTIONS, ARE MADE BY A CONTROLLABLE PROCESS COMPRISING (1) ADDING AN ALKALI OR ALKALINE EARTH METAL NITRITE TO LIQUID 1,3-DICHLOROBUTENE-2 OR DIISOBUTYLENE WITH AGITATION, (2) SLOWLY ADDING CONCENTRATED HYDROCHLORIC OR SULFURIC ACID TO THE MIXTURE SO OBTAINED, AND (3) RECOVERING A REACTION PRODUCT OF NITROUS ACID AND 1,3-DICHLOROBUTENE2 OR DIISOBUTYLENE FROM THE BY-PRODUCT ALKALI OR ALKALINE EARTH METAL SALT FORMED.