Binder for high wet-strength substrates
First Claim
1. An emulsion binder composition comprising:
- a) at least 50 percent by weight percent of vinyl ester monomer units;
b) 0 to 40 percent by weight of ethylene monomer units;
c) 5 to 20 percent by weight of cross-linking monomer composition; and
d) 0 to 40 percent by weight of other co-monomers,wherein the components are selected and processed such that said emulsion binder composition provides a characteristic wet strength value of greater than 4,500 g/in.
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Abstract
The present invention is directed to a fibrous substrate made of chemically bonded fibers, where the fibers are bound with a polymeric binder in an amount which is sufficient to bind the fibers together to form a self-sustaining web, and where the binder is characterized as having a wet tensile strength of greater than 4500 grams per inch (g/in) when measured at a 20 percent add-on on Whatman #4 CHR chromatography paper which is drum dried for 90 seconds at 210 to 215° F. and cured for 2 minutes at 300 to 325° F. Preferably the level of free formaldehyde in the fibrous substrate is less than 15 ppm. The emulsion binders of the invention may be used to bind fibers together in a substrate; may be used to bind pigment, colors or other substances to a substrate; may be used as a backing material; or may be used to finish or surface-treat a substrate. Because of the high level of crosslinking, substrates bound, or treated with the emulsion polymer have excellent wet strength and good durability/weatherability and water/solvent resistance.
14 Citations
20 Claims
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1. An emulsion binder composition comprising:
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a) at least 50 percent by weight percent of vinyl ester monomer units; b) 0 to 40 percent by weight of ethylene monomer units; c) 5 to 20 percent by weight of cross-linking monomer composition; and d) 0 to 40 percent by weight of other co-monomers, wherein the components are selected and processed such that said emulsion binder composition provides a characteristic wet strength value of greater than 4,500 g/in. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An emulsion binder composition for a fibrous non-woven web comprising an ethylene-vinyl acetate copolymer and from about 6 to 20 wt. percent of cross-linker,
wherein said binder composition exhibits a viscosity of less than 1350 cps when measured at a solids content of about 50 wt. percent; - and
wherein further the components are selected and processed such that said emulsion binder composition provides a characteristic wet strength value of greater than 4,500 g/in. - View Dependent Claims (16, 17, 18)
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19. An emulsion binder composition comprising:
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a) at least 50 percent by weight percent of vinyl ester monomer units; b) ethylene monomer units copolymerized with said vinyl ester monomer units; c) 5 to 20 percent by weight of cross-linking monomer composition comprising N-methylol acrylamide; and d) 0 to 40 percent by weight of additional co-monomers, wherein said binder composition exhibits a viscosity of less than 1350 cps when measured at a solids content of about 50 wt. percent; and wherein the components are selected and processed such that said emulsion binder composition provides a characteristic wet strength value of greater than 4,500 g/in. - View Dependent Claims (20)
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Specification
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- Resources
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Current AssigneeCelanese International Corporation (Celanese Corporation)
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Original AssigneeCelanese International Corporation (Celanese Corporation)
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InventorsParsons, John C., Barcomb, Christopher, Mumick, Pavneet, Nass, David R., Walker, James L.
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Primary Examiner(s)PEZZUTO, HELEN LEE
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Application NumberUS11/343,465Publication NumberTime in Patent Office1,309 DaysField of Search524/819, 524/820, 524/827, 524/828, 524/832US Class Current524/832CPC Class CodesD04H 1/587 characterised by the bondin...D04H 1/64 the bonding agent being app...Y10T 442/2213 Coating or impregnation is ...Y10T 442/2369 Coating or impregnation imp...Y10T 442/2762 Coated or impregnated natur...Y10T 442/2787 Coating or impregnation con...Y10T 442/2861 Coated or impregnated synth...Y10T 442/60 Nonwoven fabric [i.e., nonw...Y10T 442/674 Nonwoven fabric with a pref...
