Sulfonation process

Details Sulfonation process Sulfonation process

1990-11-13

1992-05-26

Shippen, Michael L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

528272, 528295, 560 96, C07C 6728, C07C 6729, 560, 560, 528, 528

Patent

active

051170418

ABSTRACT:
Allyl end-capped propylene terephthalate polyester oligomers are sulfonated in an aqueous system in the presence of a free radical initiator by a process in which only a part (about 15% to 40%) of the source of bisulfite is added at the start of the sulfonation step with the remainder being added later in that step, in such increments as will permit maintaining a clear single phase, to give sulfinate-containing sulfonated products, following which the sulfinate content is oxidized to give sulfonated end-capped propylene terephthalate polyester oligomers.

REFERENCES:
patent: 4647284 (1987-03-01), Karydas et al.
patent: 4721580 (1988-01-01), Gosselink
patent: 4883899 (1989-11-01), Muramoto et al.

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