US 7,320,831 B2
Salt-sensitive vinyl acetate binder compositions and fibrous article incorporating same
Rajeev Farwaha, Belle Mead, N.J. (US); Steven P. Pauls, Sr., Old Bridge, N.J. (US); and Pavneet S. Mumick, Belle Mead, N.J. (US)
Assigned to Celanese International Corporation, Dallas, Tex. (US)
Filed on May 03, 2005, as Appl. No. 11/120,372.
Prior Publication US 2006/0252876 A1, Nov. 09, 2006
Int. Cl. C08K 3/26 (2006.01)
U.S. Cl. 428—507  [428/511; 428/522] 40 Claims
 
1. A binder solution for a fibrous web, said solution comprising:
(a) an aqueous solvent medium; and
(b) a binder composition comprising a salt sensitive copolymer that incorporates the residue of:
(i) from about 60 to about 90 weight percent of vinyl acetate;
(ii) from about 2 to about 20 weight percent of a carboxylic acid monomer; and
(iii) from about 5 to about 30 percent vinyl ester of the formula:

OG Complex Work Unit Drawing
where R1 and R2 are alkyl groups collectively having between 3-14 carbon atoms,wherein said copolymer is neutralized with base at least to the point where it is water soluble,and wherein said binder composition has a characteristic wet strength of at least about 75 gf/in in a 10% NaCl solution, and a characteristic wet strength of less than 50 gf/in in deionized water.