Thermoplastic elastomers prepared via cationic grafting
AssigneeThe Firestone Tire & Rubber Company
InventorRichard Joseph Ambrose
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Abstract
Thermoplastic elastomers having improved high service temperatures and increased tensile strength are prepared by grafting cationic polymerizable monomer, such as alpha-methyl styrene, to halogenated backbone such as chlorinated polybutadiene, said grafting being effected in the presence of inert organic solvent and alkyl aluminum catalyst together with a controlled amount of water to achieve an improved polymerization rate and increased monomer conversion.
Claims1
In the process for grafting alpha-methyl styrene from chlorinated polybutadiene in the presence of toluene and trimethyl aluminum, the improvement wherein said grafting is conducted in the presence of from about 1.5 to about 2.5 .times. 10.sup.-3 M water dissolved in said toluene, said water and toluene being added prior to the addition of said trimethyl aluminum.
Dependencies are inferred from the claim text.