Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Process of treating scrap or waste product containing solid...
Reexamination Certificate
2011-03-08
2011-03-08
Choi, Ling-Siu (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Process of treating scrap or waste product containing solid...
C521S040500, C521S047000, C521S048000, C528S271000, C528S272000, C528S275000, C528S308200, C528S480000, C528S481000, C528S488000, C528S489000, C528S495000, C528S50200C
Reexamination Certificate
active
07902263
ABSTRACT:
The invention relates to a process for making modified polybutylene terephthalate random copolymers from a polyethylene terephthalate component. In one embodiment, the invention relates to a two step process in which a 1,4-butane diol component reacts with a polyethylene terephthalate component under conditions that depolymerize the polyethylene terephthalate component into a molten mixture and the molten mixture is placed under subatmospheric conditions that produce the modified polybutylene terephthalate random copolymers. In another embodiment, the invention relates to a three step process in which a diol component selected from the group consisting of ethylene glycol, propylene glycol, and combinations thereof reacts with a polyethylene terephthalate component under conditions sufficient to depolymerize the polyethylene terephthalate component into a first molten mixture; and where the first molten mixture is combined with 1,4-butane diol under conditions that create a second molten mixture that is subsequently placed under subatmospheric conditions that produce the modified polybutylene terephthalate random copolymers. The invention also relates to compositions made from processes of the invention.
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Agarwal Parminder
Cohoon Kristen
Dhawan Sandeep
Gallucci Robert Russell
Kannan Ganesh
Cantor & Colburn LLP
Choi Ling-Siu
Sabic Innovative Plastics IP B.V.
Tischler Frances
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