摘要:
An improved process for the sulfonation of an unsaturated elastomeric polymer to form a sulfonated elastomeric polymer, wherein a cement which contains an elastomeric polymer dissolved in a non-reactive solvent is contacted with a sulfonating agent at between about -100.degree. C. and +100.degree. C. for a period of time sufficient to result in the sulfonation of the elastomeric polymer wherein the improvement includes the use of a sulfonating agent which is formed from mixtures of a sulfur trioxide donor complexed with a Lewis base and a carboxylic acid anhydride ##STR1## or an acyl halide ##STR2## or with both, wherein R is selected from the group consisting of CH.sub.3 --, C.sub.2 H.sub.5 --, C.sub.3 H.sub.7 --, C.sub.4 H.sub.9 --, C.sub.5 H.sub.11, C.sub.6 H.sub.13 and C.sub.6 H.sub.5 and mixtures thereof. The molar ratio of ##STR3## and/or ##STR4## with the SO.sub.3 of the complex is at least 0.5.
摘要:
An improved process for the manufacture of extended gel free sulfonated elastomeric products includes the formation of a homogeneous mixture of fillers and oils with the acid form of the sulfonated polymer prior to the neutralization of the acid form of the sulfonated polymer with a basic material thereby resulting in a composition having improved physical properties.
摘要:
This invention relates to a process for the formation of a neutralized sulfonated polymer having about 10 to about 60 meq. sulfonate groups, wherein the sulfonate groups are neutralized with a zinc counterion. A cement of a polymer having olefinic functional groups and a non-reactive solvent is contacted with a sulfonated agent such as an acyl sulfate. The sulfonated polymer is then neutralized with a solution of zinc acetate dissolved in a solvent system of methanol alone or methanol and water, wherein the volume percent of methanol based on non-reactive solvent is less than about 10. A carboxylic acid can be then added to the cement of the neutralized sulfonated polymer thereby forming a zinc salt of the carboxylic acid in situ, wherein the zinc salt of the carboxylic acid is a preferential plasticizer for the zinc sulfonate groups. The Brookfield viscosity at 0.6 rpm at room temperature of the cement of the zinc neutralized sulfonated polymer is less than about 50,000 cps.
摘要:
This invention relates to an improved process for the formation of an improved gel-free neutralized sulfonated elastomeric polymer having about 10 to about 50 meq. unneutralized sulfonate groups, wherein the unneutralized sulfonate groups are neutralized with a metal counterion being selected from the group including lithium, sodium, potassium, cesium, barium, calcium, magnesium, zinc, lead, iron (II), copper (II), mercury (II), and nickel. A cement of an elastomeric polymer having olefinic functional groups dissolved in a non-reactive solvent is contacted with a sulfonating agent such as an acyl sulfate thereby sulfonating the elastomeric polymer, and the sulfonation reaction is subsequently quenched by the addition of isopropanol at a concentration level of about 5 to about 30 volume percent based on a volume of the non-reactive solvent. The unneutralized sulfonated elastomeric polymer is then neutralized with a neutralizing agent dissolved in water, the water being at a concentration level of less than about 2.5 volume percent based on the volume of the non-reactive solvent thereby forming a gel-free cement of the neutralized sulfonated elastomeric polymer having a Brookfield viscosity at room temperature of less than about 20,000 cps.
摘要:
This invention relates to extrusion and injection moldable type elastomeric compositions having a viscosity at 200.degree. C. at 0.73 sec.sup.-1 of about 8.times.10.sup.4 to about 8.times.10.sup.5 poises. The compositions used for elastomeric articles include 100 parts of a neutralized sulfonated EPDM terpolymer; about 25 to about 150 parts per hundred of a non-polar process oil; about 50 to about 300 parts per hundred of a filler; and a preferential plasticizer at about 0 to about 50 parts per hundred based on 100 parts of the sulfonated elastomeric polymer. The composition may also include a crystalline polyolefinic thermoplastic at less than about 100 parts per hundred by weight.These blend compositions can be readily processed due to their superior rheological properties on conventional plastic fabrication equipment into elastomeric articles having excellent physical properties and desirable rubbery characteristics.
摘要:
This invention relates to injection moldable type elastomeric compositions having a viscosity at 200.degree. C. at 0.73 sec.sup.-1 of less than about 8.times.10.sup.4 poises. The compositions used for elastomeric articles include 100 parts of a neutralized sulfonated EPDM terpolymer; about 25 to about 150 parts per hundred of a non-polar process oil; about 25 to about 200 parts per hundred of a filler; and a preferential plasticizer at about less than 50 parts per hundred based on 100 parts of the sulfonated elastomeric polymer. The composition may also include a crystalline polyolefinic thermoplastic at least than about 100 parts per hundred by weight.These blend compositions can be readily processed due to their superior rheological properties on conventional plastic fabrication equipment, especially on low pressure injection molding equipment into elastomeric articles having excellent physical properties and desirable rubbery characteristics.
摘要:
This invention relates to elastomeric blend compositions of a neutralized sulfonated elastomeric polymer. The compositions include a major portion of a sulfonated elastomeric polymer and a minor proportion of a non-polar wax, wherein the resultant composition has both improved physical and rheological properties.
摘要:
This invention relates to a process for first preparing a free flowing finely divided powder of a neutralized sulfonated elastomer and subsequently and optionally admixing said formed powder with other agents such as fillers and oils thereby providing free flowing powders capable of being subsequently fabricated into tough elastomeric objects. The neutralized sulfonated elastomeric polymer can be converted into a free flowing finely divided powder which does not agglomerate or cold flow under ambient conditions by a variety of processes, preferably by a grinding process conducted at low temperatures. The formed powder of the neutralized sulfonated elastomeric polymer is blended with at least one chemical additive into a homogeneous mixture, wherein the chemical additive is selected from the group including fillers, polyolefinic thermoplastics, non-polar backbone process oils, lubricants or a metallic oxide and mixtures thereof. The homogeneous mixture is formed into a finished elastomeric article by conventional fabrication.
摘要:
This invention relates to a process for the manufacture of a blend composition of a neutralized sulfonated ethylene propylene terpolymer (EPDM) which includes the steps of sulfonating the EPDM dissolved in a solvent to form an unneutralized sulfonated elastomeric polymer. The solution of the unneutralized sulfonated EPDM is quenched with an aliphatic alcohol. The unneutralized sulfonated elastomeric polymer in solution is then neutralized with a neutralizing agent to form the neutralized sulfonated EPDM in solution. A critically selected non-polar backbone process oil is added under agitation to the solution thereby plasticizing the neutralized sulfonated EPDM with the process oil. The neutralized sulfonated EPDM plasticized with the process oil is then recovered from the solution.
摘要:
A bulk sulfonation process for the preparation of sulfonated polymers from hydrocarbon polymers having olefinic unsaturation or aromatic moieties, or both, includes intimately mixing the polymer by mechanical means in the absence of a solvent for the polymers with a sulfonation reagent at a sufficient temperature and time to effect the desired degree of sulfonation. The sulfonated polymer may be recovered as the free sulfonic acid or neutralized ionically with a basic compound. Sulfonated polymers including a substantial proportion of aromatic moieties yield water-soluble or water-dispersible salts, useful as thickening and flocculating agents, when neutralized with ammonia monobasic cations or lower alkyl amines. These materials, however, when sulfonated at a low level, e.g.