The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 1993
Filed:
Aug. 21, 1990
Bethlehem K Andrews, New Orleans, LA (US);
Nancy M Morris, Metairie, LA (US);
Darrell J Donaldson, Metairie, LA (US);
Clark M Welch, Metairie, LA (US);
Abstract
Catalysts for the rapid esterification and crosslinking of fibrous cellulose in textile form by polycarboxylic acids at elevated temperatures are disclosed. The catalysts are acidic or weakly basic salts selected from the alkali metal dihydrogen phosphates and alkali metal salts of phosphorous, hypophosphorous, and polyphosphoric acids. Suitable polycarboxylic acids include saturated, unsaturated and aromatic acids, as well as alpha-hydroxy acids. The textiles so treated exhibit high levels of wrinkle resistance and smooth drying properties durable to repeated laundering in alkaline detergents, and do not contain or release formaldehyde. Textiles treated by the polycarboxylic acids and alkali metal phosphite or hypophosphite catalysts, and having residues of these catalysts present, may be identified by infrared spectroscopy and electron spectroscopy for chemical analysis, because these textiles exhibit the presence in infrared spectra of the phosphorus-hydrogen bond and the ester groups of cellulose crosslinked with the polycarboxylic acids, and the presence of trivalent phosphorus in spectra from electron spectroscopy for chemical analysis.