Ronald G Tigner

US Patent:

49754963, Dec 4, 1990

Filed:

Aug 10, 1989

Appl. No.:

7/391823

Inventors:

Ronald G. Tigner - Coleman MI
Edward R. Falardeau - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F 822

US Classification:

525357

Abstract:

Styrenic polymers are brominated by a process comprising dispersing at least one Lewis acid catalyst in at least one inert halogenated solvent and contacting said Lewis acid catalyst dispersion with a solution of at least one ring-brominatable styrenic polymer in at least one inert halogenated solvent and at least one brominating agent.

US Patent:

39325415, Jan 13, 1976

Filed:

May 24, 1973

Appl. No.:

5/363687

Inventors:

Ralph A. Davis - Midland MI
Ronald G. Tigner - Coleman MI
Joseph J. Pedjac - Mount Pleasant MI
Laurence I. Peterson - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C07C 3134

US Classification:

260633

Abstract:

Brominated pentaerythritols are prepared at reaction temperatures of from about 85. degree. to 135. degree. C. by reacting pentaerythritol with HBr in the liquid phase employing a solvent medium containing from about 0. 8 to about 25 mole percent of an aliphatic carboxylic acid of 2 to 8 carbon atoms and their anhydrides, based on the pentaerythritol. The HBr is fed continuously to the reactor throughout the reaction. The water formed as a result of the reaction remains in the reaction mixture until substantial completion of the reaction. The product can be predominantly dibromoneopentyl glycol or tribromoneopentyl alcohol and is characterized by the absence of tar formation.