Method for making a dicyclopentadiene cross-linked polymer and t

Details Method for making a dicyclopentadiene cross-linked polymer and t Method for making a dicyclopentadiene cross-linked polymer and t

1987-06-10

1989-02-28

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

526282, 526283, 526169, 525247, C08F 3206

Patent

active

048086355

ABSTRACT:
Disclosed is a method of making a cross-linked poly(dicyclopentadiene) with a metathesis-catalyst system, where the metathesis-catalyst system contains an organoaluminum or organoaluminum halide activator and a pentavalent tantalum catalyst. In a preferred embodiment, the cross-linked polymer is formed by combining, in a first place, a plurality of reactant streams, one reactant stream which contains the activator, a second reactant stream which contains the catalyst and at least one reactant stream which contains dicyclopentadiene; then injecting the combined reactant streams into a second place, such as a mold, where polymerization occurs. Use of the pentavalent tantalum catalyst results in the formation of a cross-linked polymer having less color and greater transparency than cross-linked poly(dicyclopentadiene) made without a pentavalent tantalum catalyst.

REFERENCES:
patent: 3084147 (1963-04-01), Wilks
patent: 3211709 (1965-10-01), Adamek et al.
patent: 3551182 (1970-12-01), Wismer et al.
patent: 3627739 (1971-12-01), Devlin
patent: 4568660 (1986-02-01), Klosiewicz
patent: 4588794 (1986-05-01), Oda et al.

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