Eastman Chemical Company

Grupo Petrotemex S.a. De C.v.

Mary Therese Jernigan

Bruce Roger Debruin

Rodney Scott Armentrout

Kenrick Lyle Venett

Michael Paul Ekart

Frederick Leslie Colhoun

Bruce Roger DeBruin

John Cleaon Moore

Steven Lee Stafford

Stephen Weinhold

Spencer Erich Hochstetler

Richard Dalton Peters

Donna Rice Quillen

Edward Enns McEntire

Zhiyong Xia

Michael Wayne Quillen

Zachary Philip Lee

Dale Edward O'Dell

Darryl W Muck

Gary Wayne Connell

Alan W White

Jimmy R Trotter

Mark Edward Stewart

Jason Christopher Jenkins

Douglas Weldon Carico, Jr

Howard Smith Carman, Jr

Alan Wayne White

Jimmy Ray Trotter

A bulk of polyester polymer particles comprising polyester polymer comprising greater than 75% virgin polyester polymer, the particles having:

Low melting polyester polymers

Processes associated apparatus and compositions useful for removing organic substances from substrates, for example, electronic device substrates such as microelectronic wafers or flat panel displays, are provided. Processes are presented that apply a minimum volume of a composition as a coating to the inorganic substrate whereby sufficient heat is added and the organic substances are completely removed by rinsing. The compositions and processes may be suitable for removing and, in some instances, completely dissolving photoresists of the positive and negative varieties as well as thermoset polymers from electronic devices.

Processes and compositions for removing substances from substrates

Aluminum/alkyline or alkali/titanium containing polyesters having improved reheat, color and clarity

Processess and compositions for removing substances from substrates

Aluminum/alkaline or alkali/titanium containing polyesters having improved reheat, color and clarity

Polymer blends are disclosed that comprise one or more polybutadiene homopolymers or copolymers having at least one functionality capable of entering into condensation reactions; one or more polyethylene terephthalate homopolymers or copolymers obtained using a catalyst system comprising aluminum atoms and one or more alkaline earth metal atoms, alkali metal atoms, or alkali compound residues, optionally obtained by a melt-phase polymerization process; and one or more transition metal atoms. The blends are useful for packaging, and exhibit improved oxygen-scavenging activity compared with blends made using many conventional polyethylene terephthalate polymers prepared with conventional catalyst systems.

Oxygen-scavenging polymer blends suitable for use in packaging

A bulk of polyester polymer particles comprising polyester polymer comprising greater than 75% virgin polyester polymer, the particles having: The particles may also have a degree of crystallinity within a range of 20% and a maximum degree of crystallinity Tdefined by the equation:=50%&#x2212;where CA is the total mole % of all carboxylic acid residues other than terephthalic acid residues, based on 100 mole % of carboxylic acid residues, and OH is the total mole % of all hydroxyl functional compound residues other than ethylene glycol residues, based on 100 mole % of hydroxyl functional compounds residues. The preforms and bottles made from these particles can be obtained by melt processing these particles at either lower overall power, faster screw speeds, lower residence time, or lower overall cycle time to thereby reduce the level of residual acetaldehyde generated in the melt.

A polyester polymer composition containing polyester polymers such as polymers having repeating ethylene terephthalate units, aluminum atoms in an amount of at least 3 ppm based on the weight of the polymer, the polyester polymers having an It.V. of at least 0.72 dL/g obtained through a melt phase polymerization and a residual acetaldehyde level of 10 ppm or less. Also provided are polyester polymer compositions containing polyester polymers and:

Aluminum containing polyester polymers having low acetaldehyde generation rates

Processes for producing polyethylene terephthalate copolyesters are disclosed, that include the steps of:

Copolyesters having improved thermal stability and methods for making them

In one embodiment, there is provided a process comprising introducing polyester polymer particles containing residual acetaldehyde into a vessel at a temperature within a range of 130&#xb0; C. to 195&#xb0; C. to form a bed of particles within the vessel, flowing a gas through at least a portion of the particle bed, and withdrawing finished particles from the vessel having a reduced amount of residual acetaldehyde. In this process, it is not necessary to introduce a hot flow of gas at high flow rates otherwise required to heat up cool particles to a temperature sufficient to strip acetaldehyde. Rather, this process provides a benefit in that, if desired, gas introduced into the vessel at low flow rates and low temperatures can nevertheless effectively strip acetaldehyde in a reasonable time because the hot particles quickly heat a the gas to the particle temperature.

Removal of residual acetaldehyde from polyester polymer particles

Growing community of inventors

Kingsport, TN, United States of America

Rodney Scott Armentrout