Barrier coatings
AssigneeE. I. Du Pont de Nemours and Company
InventorFrederick J. Keene
Life of this patent
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Abstract
An oil and water repellent barrier coating composition comprising a non-aqueous solution of: (A) a film forming polymer; and (B) a fluorochemical surface tension modifier is provided. Optionally the barrier coating composition can also contain a plasticizer. Such composition is useful in imparting oil, grease, and water repellency to cellulosic substrates such as paper, paperboard, cellophane, and wood and provides improved coatings for packaging and non-packaging materials.
Claims3
A coating composition consisting essentially of a non-aqueous solution of:
- (A) 25-99.5 parts by weight, based on the weight of (A) plus (B) plus (C), of nitrocellulose film-forming polymer;
- (B) 0.5-10 parts by weight, based on the weight of (A) plus (B) plus (C), of a fluorochemical surface tension modifier selected from the group consisting of:
- ##STR2## where M = H or cation;
- R = h, ch.sub.2 ch.sub.2 (cf.sub.2 cf.sub.2).sub.n F or mixtures thereof, and no more than one R can be H;
- and
- n = 3-8;
- and
- (b) an anionically, cationically or non-ionically N-substituted perfluoroalkyl sulfonamide;
- and
- (C) 0-75 parts by weight, based on the weight of (A) plus (B) plus (C), of a plasticizer.
A coating composition consisting essentially of a non-aqueous solution of:
- (A) 45-50 parts by weight, based on the weight of (A) plus (B) plus (C), of nitrocellulose film forming polymer;
- (B) 1-2 parts by weight, based on the weight of (A) plus (B) plus (C), of a fluorochemical surface tension modifier of the formula:
- ##STR3## where M = H or cation and
- R = h, ch.sub.2 ch.sub.2 (cf.sub.2 cf.sub.2).sub.n F or mixtures thereof and
- n = 3-8;
- and
- (C) 50-55 parts by weight, based on the weight of (A) plus (B) plus (C), of a plasticizer.
Dependencies are inferred from the claim text.