Dicyclopentadiene activation method and polymerization composition
AssigneeNippon Zeon Co., Ltd.
InventorsKin-ichi Okumura, Masao Torii, Hirotoshi Tanimoto, Motoyuji Yamato
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Abstract
A highly polymerizable dicyclopentadiene (DCPD) monomer composition is obtained. The dicyclopentadiene so obtained is highly suitable for ring-opening polymerization by metathesis catalysts. The active DCPD yields articles with excellent physical properties upon in-mold polymerization.
Claims15
A metathesis polymerizable composition comprising activated dicyclopentadiene, wherein said activated dicyclopentadiene is obtained by contacting crude dicyclopentadiene containing metathesis polymerization inhibitors with at least one reducing agent and reacting said reducing agent with said polymerization inhibitors for about 10 minutes to about 2 hours at a temperature ranging from about 30.degree. to about 120.degree. C., wherein the reaction products of said reducing agent(s) and said metathesis polymerization inhibitors are not removed from the metathesis polymerizable composition and wherein said reducing agent is selected from the group consisting of lithium, sodium, metal hydrides selected from lithium hydride, sodium hydride, lithium aluminum hydride, organoalkali metal compounds selected from methyllithium, ethyllithium, n-propyllithium, n-butyllithium, sec-butyllithium, cyclohexyllithium, phenyllithium, benzyllithium, phenylsodium, benzylsodium, naphthalenesodium, triphenylmethylsodium, phenylpotassium, butadienepotassium, styrenepotassium, naphthalenepotassium, cyclopentadienylsodium, lithium enolate, sodium enolate, Group IIIA organometal compounds selected from triethylboron, trimethylaluminum, triethylaluminum, triisobutylaluminum, tricyclohexylaluminum, ethylaluminum sesquichloride, ethylaluminum dichloride, diethylethoxyaluminum, Group IVA organic compounds selected from tetraethyl silicate, triethyl hydrogen silicate, hydrogen tributyltin, dibutyllead, Grignard reagents selected from methylmagnesium chloride, ethylmagnesium chloride, ethylmagnesium bromide, n-butylmagnesium chloride, butylmagnesium iodide, phenylmagnesium chloride, vinylmagnesium chloride, arylmagnesium chloride, and compounds selected from diethylmagnesium, dibutylmagnesium, dimethylzinc, diethylzinc, dibutylzinc, methylzinc iodide, ethylzinc iodide, n-propylzinc iodide, dimethylcadmium, diethylcadmium, bidutylcadmium, diphenylcadmium, and mixtures thereof.
A process for the preparation of dicyclopentadiene having high polymerization activity comprising dispersing at least one reducing agent within crude dicyclopentadiene containing metathesis polymerization inhibitors and reacting said reducing agent with said polymerization inhibitors under suitable reaction conditions by mixing the crude dicyclopentadiene and the reducing agent from about 10 minutes to about 2 hours at a temperature ranging from about 30.degree. to about 120.degree. C., and optionally separating the reaction products from the dicyclopentadiene composition, to obtain a metathesis polymerizable dicyclopentadiene composition.
Dependencies are inferred from the claim text.