Grant O Sedgwick

US Patent:

45262195, Jul 2, 1985

Filed:

Sep 30, 1982

Appl. No.:

6/431962

Inventors:

William R. Dunnavant - Columbus OH
Heimo J. Langer - Columbus OH
Grant O. Sedgwick - Gahanna OH

Assignee:

Ashland Oil, Inc. - Ashland KY

International Classification:

B22C 902
B22C 120

US Classification:

164 16

Abstract:

A binder is formed by polymerizing or hardening a binding material or composition, an unsaturated polymer or unsaturated monomer or mixtures thereof (polymer solution), wherein at least part of the unsaturation is ethylenic, preferably of vinyl or acrylic type, by free radical polymerization. The free radical polymerization is caused by contacting the unsaturated binding material with a free radical initiator comprising a peroxide and catalytic agent. In the preferred embodiment the binding material is a solution of an ethylenically unsaturated polymer in a solvent of unsaturated monomeric compound or compounds, in which vinyl or acrylic unsaturation is present. The binder is formed upon polymerization which occurs when the unsaturated monomer, polymer or polymer solution is exposed to the free radical initiator. Subjection of the unsaturated monomer, polymer or polymer solution to the initiator begins the formation of free radicals and subsequently the binding composition is polymerized to form the binder. This binder has been found to be especially suitable as a foundry binder of the cold box type wherein a room temperature, rapid gas cure is utilized.