Continuous process for making melt-processable optical grade rin

Details Continuous process for making melt-processable optical grade rin Continuous process for making melt-processable optical grade rin

1995-08-08

1998-01-06

Lipman, Bernard

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253321, 525338, C08F 804

Patent

active

057055726

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 hydrogenated 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 hydrogenated polymer cement, and, (E) recovering a solid polymer which meets particle count specifications for optical grade polymer.

REFERENCES:
patent: 3557072 (1971-01-01), Vergne et al.
patent: 4178424 (1979-12-01), Tenney et al.
patent: 4945144 (1990-07-01), Grubbs et al.
patent: 5106920 (1992-04-01), Murakami et al.
patent: 5115037 (1992-05-01), Asrar
patent: 5169905 (1992-12-01), Hashiguchi et al.
patent: 5202388 (1993-04-01), Iio et al.
patent: 5206306 (1993-04-01), Shen et al.
patent: 5319034 (1994-06-01), Shen et al.
patent: 5439992 (1995-08-01), Yi et al.
patent: 5539060 (1996-07-01), Tsunogae et al.

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