Method for producing butanediol dimethacrylates

Details Method for producing butanediol dimethacrylates Method for producing butanediol dimethacrylates

2008-05-08

2011-10-18

Katakam, Sudhakar (Department: 1621)

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

Organic compounds

Carboxylic acid esters

Reexamination Certificate

active

08039664

ABSTRACT:
The present invention relates to a process for preparing butanediol dimethacrylates, which comprises the transesterification of butanediol with an ester of methacrylic acid in the presence of catalysts, wherein a combination comprising at least one lithium compound and at least one calcium compound is used as catalyst, at least one of the compounds of lithium and/or of calcium is an oxide, a hydroxide, an alkoxide having from 1 to 4 carbon atoms or a carboxylate having from 1 to 4 carbon atoms and at least part of the reaction is carried out in the presence of an effective amount of water. The process of the invention makes a particularly inexpensive preparation of butanediol dimethacrylates having a very high purity possible.

REFERENCES:
patent: 4672105 (1987-06-01), Schlosser et al.
patent: 5362904 (1994-11-01), Kearns
patent: 0 534 666 (1993-03-01), None
U.S. Appl. No. 12/667,604, filed Jan. 4, 2010, Schmitt, et al.
U.S. Appl. No. 12/667,538, filed Jan. 4, 2010, Knebel, et al.
U.S. Appl. No. 12/667,599, filed Jan. 4, 2010, Protzmann, et al.

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