Ethylene vinyl acetate compositions for paper saturation
AssigneeNational Starch and Chemical Corporation
InventorsJames L. Walker, Marie E. Yannich
Life of this patent
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Abstract
Saturated paper products characterized by an excellent balance of toughness, strength, fold, tear and delamination resistance comprising a sheet of loosely bonded cellulose fibers saturated with an aqueous emulsion prepared by the emulsion polymerization of: (a) a vinyl ester of an alkanoic acid interpolymerized with: (b) 5 to 30% by weight of ethylene; (c) 0.5 to 6% by weight of an N-methylol containing copolymerizable monomer; (d) 1 to 5% by weight of an olefinically unsaturated carboxylic acid; (e) 0.2 to 3% by weight of a latex stabilizer; and (f) 0 to 1% by weight of at least one polyunsaturated copolymerizable monomer.
Claims15
A saturated paper product characterized by an excellent balance of toughness, strength, fold, tear and delamination resistance comprising a web containing cellulose fibers saturated with an aqueous emulsion prepared by the emulsion polymerization at a pH of 2 to 7 of:
- (a) a vinyl ester of an alkanoic acid having 1 to 13 atoms interpolymerized with the following comonomers:
- (b) 5 to 30% by weight of ethylene;
- (c) 0.5 to 6% by weight of an N-methylol containing copolymerizable monomer;
- (d) 1 to 5% by weight of an alkenoic acid having from 3 to 6 carbon atoms or an alkenedioic acid having from 4 to 6 carbon atoms;
- (e) 0.2 to 3% by a weight of a latex stabilizer;
- and
- (f) 0 to 1% by weight of at least one polyunsaturated copolymerizable monomer;
- said web fibers being saturated with said composition in an amount of from about 10 to 100 parts by weight on a solids weight basis per 100 parts by weight of fibers.
A process for manufacturing a paper product characterized by an excellent balance of toughness, strength, fold, tear, and delamination resistance which comprises the steps of:
- (I) saturating a web containing cellulose fibers with a composition comprising an aqueous emulsion prepared by the emulsion polymerization at a pH of 2 to 7 of:
- (a) a vinyl ester of an alkanoic acid having 1 to 13 carbon atoms interpolymerized with the following comonomers:
- (b) 5 to 30% by weight of ethylene;
- (c) 0.5 to 6% by weight of an N-methylol containing copolymerizable monomer;
- (d) 1 to 5% by weight of an olefinically unsaturated carboxlyic;
- alkenoic acid having from 3 to 6 carbon atoms or an alkenedioic acid having from 4 to 6 carbon atoms;
- (e) 0.2 to 3% by weight of a latex stabilizer;
- and
- (f) 0 to 1% by weight of at least one polyunsaturated copolymerizable monomer;
- said web fibers being saturated with from about 10 to 100 parts by weight on a solids weight basis per 100 parts by weight of fibers with said composition;
- and
- (II) subjecting said saturated sheet to temperatures above 100.degree. C. to remove excess water and to effect cure of the saturant.
Dependencies are inferred from the claim text.