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

1985-04-15

1987-10-27

Smith, Edward J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521142, 526142, 526143, 526169, 526280, 526281, 526283, 525247, C08F 202, C08F 468, C08F 3600

Patent

active

047030682

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: 3684781 (1972-08-01), Nutzel et al.
patent: 3817964 (1974-06-01), Schon et al.
patent: 4400340 (1983-08-01), Klosierwiez
patent: 4436858 (1984-03-01), Klosierwiez
patent: 4604408 (1986-08-01), Newburg
Tadmor et al, Principles of Polymer Processing, (1979), pp. 601-611.

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