Abstract: Polymerization slurries of elastomeric isoolefin homopolymers and copolymers, such as butyl rubber, in diluents such as methyl chloride are effectively stabilized against agglomeration of polymer particles through addition of minor proportions of (i) a preformed copolymer stabilizer having both a lyophobic or lyophilic portion, or (ii) an in situ formed stabilizer from a functional lyophilic stabilizer precursor capable of copolymerizing or otherwise chemically bonding with the polymer product. Agglomeration of polymer products is effectively prevented, yielding a number of significant processing advantages. The process is especially adaptable to the production of isobutylene-isoprene butyl rubber.

Abstract: Polymerization slurries of elastomeric isoolefin homopolymers and copolymers, such as butyl rubber, in diluents such as methyl chloride, are effectively stabilized against agglomeration of polymer particles through addition of minor proportions of (i) a preformed copolymer stabilizer having both a lyophobic or lyophilic portion, or (ii) an in situ formed stabilizer from a functional lyophilic stabilizer precursor capable of copolymerizing or otherwise chemically bonding with the polymer product. Agglomeration of polymer products is effectively prevented, yielding a number of significant processing advantages. The process is especially adaptable to the production of isobutylene-isoprene butyl rubber.

Abstract: Isobutylene-based elastomers containing 3-15 mol percent enchained cyclic diolefin such as cyclopentadiene, and other comonomers such as isoprene, piperylene and butadiene to allow for chemical modification with anhydride, carboxy, hydroxy, etc. to produce a one package through cure system.

Abstract: Isobutylene-based elastomers containing 3-15 mol percent enchained cyclic diolefin such as cyclopentadiene, and other comonomers such as isoprene, piperylene and butadiene to allow for chemical modification with anhydride, carboxy, hydroxy, etc. to produce a one package through cure system.

Abstract: A continuous process for the preparation of gel-free interpolymers from monomers comprising one or more halomethylated vinyl aromatic compounds and one or more Type III monoolefins is characterized by the use of a solvent or mixture of solvents in which the reactants and the interpolymers are soluble; a soluble Lewis acid or Friedel-Crafts catalyst, especially an organo-Group IIIa element halide catalyst; a reaction temperature in the range of -120.degree. C to -20.degree. C; and a conversion of at least one of the monomers to interpolymer in excess of 85 percent. The interpolymers may be crosslinked with nucleophilic reagents to produce elastomeric compositions; quaternized with nitrogen, sulfur or phosphorous compounds to give self-emulsifying latices useful as surface coatings or converted to sulfonic or carboxylic derivatives for the preparation of ionomer resins.

Abstract: A process for preparing a homogeneous random polymer of two or more cationically polymerizable monomers having the general formula: ##EQU1## wherein R.sub.1 is alkyl, alkenyl, phenyl, aralkyl or alkaryl, R.sub.2 is H, alkenyl or alkyl and where R.sub.2 is H, R.sub.1 must be phenyl or alkylaryl, which comprises continuously reacting said monomers in a mixed solvent system comprising a polar organic solvent and a nonpolar, nonaromatic hydrocarbon solvent, said polymerization being carried out in a well-stirred reactor in the presence of a Friedel-Crafts catalyst. The preferred polymer is a homogeneous random styrene-isobutylene copolymer which is prepared by continuously reacting in solution about 10 to about 90 parts by weight of styrene with about 90 to about 10 parts by weight of isobutylene in a mixed solvent system comprising a polar organic solvent and a nonpolar nonaromatic hydrocarbon solvent.

Abstract: Polymerization reactions may be carried out in a solvent at a temperature which is above its lower critical solution temperature thereby resulting in a two-phase system comprising a solvent phase containing dissolved therein monomers and low molecular weight fractions of polymer and dispersed fluid phase comprising a solution of solvent in the higher molecular weight fraction of polymer being formed.This process technique is particularly advantageous in the preparation of low molecular weight isoolefin conjugated diolefin copolymers. In particular, propane has been found to be an ideal solvent for the isoolefin conjugated diolefin polymerization processes.The use of this type of polymerization process results in a low viscosity system having excellent heat transfer and low fouling characteristics.