1
Millicent Chen
Freddie Lee Massey, Deborah Ann Snell Tung, Millicent Louise Martin Shultz, Ben Duh, Charles Louis Kern Jr: Process to prepare a polyester resin. Shell Oil Company, Kim Muller, September 5, 2000: US06113997 (51 worldwide citation)

A process is disclosed to prepare a polyester resin having a predetermined acetaldehyde (AA) content whereby the IV of the melt phase resin is constrained to a certain range resulting in a longer SSP time to achieve a higher level of IV for the resin with an AA content of 1 PPM or less. The resultan ...


2
Ben Duh: Method for production of a high molecular weight polyester prepared from a prepolymer polyester having an optimal carboxyl content. The Goodyear Tire & Rubber Company, Oldham Oldham Hudak & Weber, December 9, 1980: US04238593 (78 worldwide citation)

A high molecular weight polyester is produced by a two stage process: a partial melt process until the intrinsic viscosity of the polyester prepolymer reaches from about 0.35 to about 0.62 dl/g, and a solid state polymerization in a static bed until the intrinsic viscosity of the polycondensed polym ...


3
Ben Duh: Method for production of high molecular weight polyester with low catalyst level and low carboxyl content. The Goodyear Tire & Rubber Company, Oldham Oldham Hudak & Weber, May 27, 1980: US04205157 (31 worldwide citation)

A high molecular weight polyester is disclosed, having a low carboxyl content, and utilizing a low catalyst level, produced by a two-stage process; a melt process until the intrinsic viscosity of the prepolymer reaches about between 0.15 and 0.45 dl/g, and a solid state polymerization in a fluidized ...


4
Ben Duh: Process for crystallization of polyethylene naphthalate. The Goodyear Tire & Rubber Company, Alvin T Rockhill, October 16, 1990: US04963644 (20 worldwide citation)

High molecular weight polyester resins are sometimes produced from low molecular weight polyester prepolymers having the same composition by solid state polymerization. Polyester prepolymers are generally converted from the amorphous state to the crystalline state prior to solid state polymerization ...


5
Ben Duh: Process for the production of high molecular weight polyester. The Goodyear Tire & Rubber Company, Bruce Hendricks, February 22, 1983: US04374975 (17 worldwide citation)

A process for the continuous production of high molecular weight polyethylene terephthalate wherein the crystallized prepolymer having an intrinsic viscosity of at least 0.3 is dried, preheated and polymerized in a single moving bed reaction zone. The method is characterized by an inert gas atmosphe ...


6
Ben Duh: Solid state polymerization. Shell Oil Company, April 18, 1995: US05408035 (15 worldwide citation)

This invention is a process for solid state polymerization of polyester using multiple reactors in series to achieve molecular weight increases, as measured by intrinsic viscosity, in excess of 0.25 dl/g with low levels of undesirable by-products.


7
Ben Duh: Process for the crystallization of polyethylene naphthalate prepolymers and the solid stating of those crystallized prepolymers. Shell Oil Company, Kim Muller, April 28, 1998: US05744578 (15 worldwide citation)

A process is disclosed for the crystallization of a PEN prepolymer containing volatile components. The temperature is maintained in the range of about 20.degree. C. above the Tg and about 10.degree. C. below the Tm while the PEN prepolymer is agitated. The PEN prepolymer is present as chips or pelle ...


8
Ben Duh, Ye Mon Chen, Ann Marie Corey: Process for preparing polytrimethylene terephthalate. Shell Oil Company, October 2, 2001: US06297315 (11 worldwide citation)

The pelletized product of melt condensation polymerization of 1,3-propanediol and terephthalic acid (or alkyl ester thereof) is crystallized by immersion in water at a temperature within the range of 60 to about 100° C. Hot-water treatment increases the crystallinity of the polymer to at least about ...


9
Ben Duh, Ye Mon Chen, Ann Marie Corey: Apparatus for crystallization of polytrimethylene terephthalate. Shell Oil Company, October 8, 2002: US06461575 (11 worldwide citation)

The pelletized product of melt condensation polymerization of 1,3-propanediol and terephthalic acid is crystallized in a vessel designed for continuous fluidized bed flow of the pellets in water at a temperature within the range of about 65 to about 100° C. Hot-water treatment in the vessel permits ...


10
Ben Duh: Process for the crystallization of polyethylene naphthalate prepolymers and the solid stating of those crystallized prepolymers. Shell Oil Company, Kim Muller, May 12, 1998: US05750644 (10 worldwide citation)

A process is disclosed for the crystallization of a PEN prepolymer containing volatile components. The temperature is maintained at a temperature in the range of about 20.degree. C. above the Tg and about 10.degree. C. below the Tm while the PEN prepolymer is agitated. The PEN prepolymer is present ...