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US 3,976,604 AGranted
Preparation of ethylenimine prepolymer
AssigneeThe United States of America as represented by the Secretary of Agriculture
InventorsEarl J. Roberts, Stanley P. Rowland
Life of this patent
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Abstract
An ethylenimine prepolymer has been prepared by mixing certain alkyl halides with ethylenimine in molar ratios of about from 44:1 to 27:1, respectively, and allowing the mixture to stand for not more than about 16 hours.
Claims1
A method for producing an ethylenimine prepolymer, the method comprising:
- a. mixing ethylenimine with an alkyl halide selected from the group consisting of 1,2-dichloroethane, tris(2-chloroethyl)phosphoramide, bis(2-chloroethylvinyl)-phosphonate, tris(2,3-dibromopropyl)phosphate, tris(1,3-dichloroisopropyl)phosphate, B,B'-dichloroethyl ether and dichloromethane in a molar ratio of about from 44:1 to 27:1;
- and
- b. allowing the mixture to stand at 10.degree. to 50.degree.C for from 2 to 16 hours.
Dependencies are inferred from the claim text.