Process for producing cyclopentadiene resin
AssigneeNippon Zeon Co., Ltd.
InventorRiso Iwata
Life of this patent
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Abstract
In a process for producing a cyclopentadiene resin having a regulated softening point which comprises heat-copolymerizing a cyclopentadiene monomer and a comonomer copolymerizable therewith, the improvement which comprises polymerizing (A) a monomeric mixture having a low content of a cyclopentadiene monomer, then adding (B) a cyclopentadiene monomer or (C) a monomeric mixture having a high content of a cyclopentadiene monomer, and continuing the polymerization.
Claims15
In a process for producing a cyclopentadiene resin having a regulated softening point which comprises heat-copolymerizing a cyclopentadiene monomer and a comonomer copolymerizable therewith, the improvement which comprises polymerizing (A) a monomeric mixture of a cyclopentadiene monomer for about 0.5 to about 6 hours at a temperature of about 230.degree. C. to about 300.degree. C., then adding (B) a cyclopentadiene monomer or (C) a monomeric mixture of a cyclopentadiene monomer, wherein the content of the cyclopentadiene monomer in the monomeric mixture (A) is at least 10% by weight lower than that of the monomer (B) or the cyclopentadiene monomer of the monomeric mixture (C), and continuing the polymerization of an additional 0.5 to 6 hours at a temperature of about 230.degree. C. to about 300.degree. C., to obtain said cyclopentadiene resin.
A process for producing a cyclopentadiene resin having a regulated softening point which comprises
- (1) heat copolymerizing at a temperature of about 230.degree. to 300.degree. C. for about 0.5 to 6 hours (A) a monomeric mixture of 40 to 85% by weight of a cyclopentadiene monomer and 60 to 15% by weight of a comonomer copolymerizable therewith;
- (2) adding to the product of step (1), either (B) a cyclopentadiene monomer or (C) a monomeric mixture of a cyclopentadiene monomer and a comonomer copolymerizable therewith, wherein the concentration of the cyclopentadiene monomer in monomeric mixture (C) is higher than the concentration of the cyclopentadiene monomer in the monomeric mixture (A) and wherein the proportion of the monomer mixture (A) is 35 to 85% by weight biased on the total monomers in steps (1) and (2);
- and
- (3) continuing the heat-copolymerizing for an additional about 0.5 to 6 hours at a temperature of about 230.degree. to 300.degree. C. to obtain said cyclopentadiene resin.
Dependencies are inferred from the claim text.