Halo-acetyl high green strength rubbers
AssigneePolysar Limited
InventorsYung-Kang Wei, Zbigniew Jack Lobos
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Abstract
Synthetic rubber compositions of improved green strength are prepared by reacting a rubbery polymer containing small amounts of tertiary amine groups bound in the polymer chain with a dihalogen compound having halogen groups located in the molecule of the compound in conjugated relationship to a carbonyl group. An example of a suitable rubbery polymer is a terpolymer of butadiene, styrene and dimethylanunoethyl methacrylate. An example of a suitable dihalogen compound is 4,4'-bis (bromoacetyl) diphenyl.
Claims13
A process of preparing a synthetic rubber composition of improved green strength, which comprises reacting an emulsion polymerized rubbery polymer of a C.sub.4 -C.sub.6 conjugated diolefin or a rubbery polymer thereof with a C.sub.8 -C.sub.10 vinyl or vinylidene substituted aromatic hydrocarbon or with a C.sub.3 -C.sub.5 vinyl compound having a nitrile group, the rubbery polymer having from about 0.5 to about 10 millimoles per 100 grams of polymer of bound tertiary amine groups incorporated therein by copolymerization with a monomer selected from dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl acrylate and diethylaminoethyl methacrylate, with a halogen compound, characterized in that the halogen compound has a general formula selected from the group consisting of ##STR6## wherein X and Y each represent one of chlorine, bromine or iodine and wherein R represents
- a. an alkylene group selected from --CH.sub.2 --, --CH.sub.2 --CH.sub.2 --, --CH(CH.sub.3)-- and --C(CH.sub.3).sub.2 --, or
- b. an aromatic group selected from ##STR7## each of which may additionally contain one or more C.sub.1 to C.sub.4 alkyl substituents on any of the aromatic nuclei, and the location of each ##STR8## group is at any of the ortho, meta or para-positions of the aromatic nucleus and in separate aromatic nuclei except where R represents ##STR9##
A synthetic rubber composition of improved green strength comprising an emulsion polymerized rubbery polymer of a C.sub.4 -C.sub.6 conjugated diolefin or a rubbery polymer thereof with a C.sub.8 -C.sub.10 vinyl or vinylidene substituted aromatic hydrocarbon or with a C.sub.3 -C.sub.5 vinyl compound having a nitrile group, the polymer having from about 0.5 to about 10 millimoles, per 100 grams of polymer, of bound tertiary amine groups incorporated therein by copolymerization with a tertiary amine group containing monomer selected from dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl acrylate and diethylaminoethyl methacrylate, the polymer having been reacted with a halogen compound characterized in that the halogen compound has a general formula selected from the group consisting of ##STR10## wherein X and Y each represent one of chlorine, bromine or iodine and wherein R represents
- a. an alkylene group selected from --CH.sub.2 --, --CH.sub.2 --CH.sub.2 --, --CH(CH.sub.3)-- and --C(CH.sub.3).sub.2 --, or
- b. an aromatic group selected from ##STR11## each of which may additionally contain one or more C.sub.1 to C.sub.4 alkyl substituents on any of the aromatic nuclei, and the location of each ##STR12## p1 group is at any of the ortho-, meta- or para- positions of the aromatic nucleus and in separate aromatic nuclei except where R represents ##STR13##
Dependencies are inferred from the claim text.