Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Reexamination Certificate
2006-02-28
2006-02-28
Boykin, Terressa (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
C422S131000, C422S135000, C528S198000, C549S228000, C549S229000, C549S230000
Reexamination Certificate
active
07005496
ABSTRACT:
A method for producing trimethylene carbonate poly(trimethylene carbonate which comprises (a) introducing liquid poly(trimethylene carbonate) and an optional catalyst into a wiped film evaporator reactor under a vacuum about 15 kPa or less, said reactor having walls heated to at least about 230° C. and an internal condenser heated to a temperature above the boiling point of trimethylene carbonate, (b)spreading the poly(trimethylene carbonate) into a thin film and allowing it to flow down the interior surface of the heated walls, (c) depolymerizing the poly(trimethylene carbonate) to form trimethylene carbonate which is driven to the internal condenser and residue poly(trimethylene carbonate) which continues down the reactor, and (d) collecting the trimethylene carbonate in a cooled distillate receiver.
REFERENCES:
patent: 5212321 (1993-05-01), Muller et al.
patent: 6054596 (2000-04-01), Ohno et al.
patent: 6580001 (2003-06-01), Bowman et al.
patent: 3418092 (1985-11-01), None
patent: 4109236 (1992-09-01), None
patent: 08-134060 (1996-05-01), None
“Studies On Polymerization And Ring Formation. III. Glycol Esters Of Carbonic Acid,” by Wallace H. Carothers and F. J. Van Natta, J. Am. Chem. Soc. 52, 314 (1930) pp. 314-326.
“Study on a New Synthetic Method for Cyclic Carbonates” Hu, Bin; Zhuo, Renxi; Fan, Changlie, Huaxue Shiji (1998), 20(6), pp. 355-356 (Chinese).
Boon Wyndham Henry
Forschner Thomas Clayton
Gingrich Laurel Arden
Gwyn David Eric
Boykin Terressa
Shell Oil Company
Taylor Richard B.
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