Discrete tungsten complexes as oxygen and water resistant DCPD p

Details Discrete tungsten complexes as oxygen and water resistant DCPD p Discrete tungsten complexes as oxygen and water resistant DCPD p

1989-02-24

1991-01-01

Garvin, Patrick P.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526283, 526169, 502102, C08F 478

Patent

active

049819313

ABSTRACT:
This invention is a process for preparing a polymer which comprises contacting pure dicyclopentadiene with a pure tungsten catalyst complex, such as WCl.sub.3 (2,6-diisopropylphenoxy).sub.3, when tributyl tin hydride or triphenyl tin hydride is used as the activator for the polymerization. This process affords a method of polymerization of dicyclopentadiene in which the mixture gels slowly without the use of a rate moderator at 80.degree. C. (in from about 15 seconds to as much as two minutes or more) and furthermore cures quite slowly (in about 3-6 minutes). This delay makes these compositions particularly applicable to reaction injection molding processes. Moreover, both the tungsten complexes and the tin activator compounds employed in this invention are relatively insensitive to oxygen and water.

REFERENCES:
patent: 4550216 (1985-10-01), Basset et al.
patent: 4598102 (1986-07-01), Leach
patent: 4729976 (1988-03-01), Sjardijin et al.
patent: 4826942 (1989-05-01), Nelson
Journal of Inorganic Chemistry, Aryloxide Ligands in the Metathesis of Olfins: Synthesis of W(OAr).sub.x Cl.sub.6-x Complexes with X=2, 3, and 4, Crystal Structures of W(0--2,6--C.sub.6 H.sub.3 --i--Pr.sub.2).sub.3 Cl.sub.3 and W(0--2,6--C.sub.6 H.sub.3 Ph.sub.2).sub.2 Cl.sub.4 ; 1987, vol. 26, pp. 4272-4277.
Chemical Abstracts, vol. 74, 1971, p. 40.
Die Angewandte Makromoleculare Chemie 14; (1970) 87-109 (Nr. 202).

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