Industrial process for the production of diphenyl sulfone...

Details Industrial process for the production of diphenyl sulfone... Industrial process for the production of diphenyl sulfone...

2007-07-10

2007-07-10

Keys, Rosalynd (Department: 1621)

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

Organic compounds

Sulfur containing

C568S027000, C568S028000, C568S032000, C568S034000

Reexamination Certificate

active

10446581

ABSTRACT:
A process for producing 4-isopropoxy-4′-hydroxydiphenyl sulfone useful as the developer for leuco dyes to be used in thermosensible papers, which is excellent in productivity, economical efficiency and safety and permits the production of the compounds from constantly available raw materials. This process is improved in productivity and economical efficiency as compared with those of the prior art both by shortening the production time by the use of an isopropyl iodide, which is more reactive than isopropyl bromide which have been used in the prior art.

REFERENCES:
patent: 3784518 (1974-01-01), Paulik
patent: 4568766 (1986-02-01), Yahagi et al.
patent: 4616239 (1986-10-01), Yahagi et al.
patent: 5284978 (1994-02-01), Kinishi et al.
patent: 6590126 (2003-07-01), Sanpei et al.
patent: 0 465 665 (1992-01-01), None
patent: 58-164131 (1985-04-01), None
patent: 60-056949 (1985-04-01), None
patent: 04-000715 (1993-07-01), None
patent: 05-186417 (1993-07-01), None
CA:122:238840 abs of Tetrahedron Lett by Joseph et al. 36(4), pp. 609-612 1995.
CA:120:120832 abs of JP05255234, Oct. 1993.
CA:129:4497 abs of JP10114735, May 1998.

Affiliated with

Also associated with

Rating

Industrial process for the production of diphenyl sulfone... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Industrial process for the production of diphenyl sulfone..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Industrial process for the production of diphenyl sulfone... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3732214