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US 4,537,993 AGranted
Bis(.beta.-carboxyethyl)isobutyl, sec. butyl and t-butyl phosphine oxide and polyamides containing the same
AssigneeAmerican Cyanamid Company
InventorsChristos Savides, Allan J. Robertson
Life of this patent
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Abstract
The compounds bis (.beta.-carboxyethyl)isobutyl phosphine oxide, bis (.beta.-carboxyethyl) sec. butyl phosphine oxide and bis(.beta.-carboxyethyl)-t-butyl phosphine oxide and their use as components in the production of fiber-forming polyamides, fibers produced from said polyamides and a method for the production of various bis (carboxyalkyl) alkyl phosphine oxides are disclosed.
Claims4
A compound having the formula:
- ##STR7## wherein R is a secondary butyl radical, an isobutyl radical or a t-butyl radical.
Dependencies are inferred from the claim text.