Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1994-06-06
1995-08-08
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
525338, 5253321, 526160, 526281, 526283, C08F23208
Patent
active
054399920
ABSTRACT:
A continuous process for the solution polymerization of appropriate polycycloolefins in a ROMP zone to obtain a processable ROMP homo- or copolymer in solution, and subsequent hydrogenation of the ROMP (co)polymer without removing the residual ROMP catalyst and co-catalyst, provides an optical product having a mol wt M.sub.w in the range from 50,000-300,000 and polydispersity M.sub.w /M.sub.n in the range from 1.3-5.0, more preferably from 1.3-3, the lower the polydispersity the more desirable the physical properties of the (co)polymer. The process comprises, (A) continuously polymerizing a substantially anhydrous solution of said monomer by ring opening metathesis polymerization in at least a first and a last reaction zone of a multi-zoned, single-stage, reaction vessel to form an unsaturated polymer cement essentially free of unreacted monomer; (B) hydrogenating said unsaturated polymer cement in the presence of an effective amount of a nickel-containing hydrogenation catalyst in an amount sufficient to produce a hydrogenareal cement wherein more than 97% of double bonds in said unsaturated polymer are converted to single bonds; (C) removing more than 99% by weight of spent polymerization catalyst, used hydrogenation catalyst and filter aid present in said hydrogenated cement to produce an essentially solids-free hydrogenated cement; (D) devolatilizing said solids-free hydrogenated cement to produce a thickened hydrogeneated polymer cement, and, (E) recovering a solid polymer which meets particle count specifications for optical grade polymer.
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Chemical Abstract 107:9784n. Acrylic Polymers for Optical Materials (1988).
Lane, Jr. Parley C.
Marchant Nancy S.
Tenney Linwood P.
Wessel John V.
Yi Kong S.
Lipman Bernard
Lobo Alfred D.
Shust Nestor W.
The B. F. Goodrich Company
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