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US 11,773,263 B2Granted
Carboxylated vinyl acetate/ethylene copolymer dispersions and uses thereof
AssigneeCelanese International Corporation
InventorsCristiana Licheri, Alistair John McLennan, Ivan Rossi, Paul Alexander Scott
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Abstract
The present invention relates to preparation of heterogeneous mixtures of (carboxylated) vinyl ester/ethylene dispersions, such as vinyl acetate/ethylene (VAE) dispersions with polyamideamine-epichlorohydrin (PAE) wet strength resins having a reduced amount of halogenated organic compounds, such as less than 1500 ppm. The dispersion offers extremely low free and bound formaldehyde levels combined with wet tensile strength for use in non-woven textile and paper applications.
Claims13
A latex-bonded non-woven material comprising a substrate;
- wherein:
- a) the substrate is bonded with a polymer binder comprising a vinyl ester/ethylene copolymer and a wet strength polyamidoamine-epichlorohydrin, (PAE), resin;
- b) the weight ratio of vinyl ester/ethylene copolymer to PAE resin is from 75:25 to 40:60;
- c) the non-woven material has a wet tensile strength value of at least 35% of its dry tensile strength value;
- and
- d) the material has a bound formaldehyde content of less than 5 ppm as determined by the VdL-RL03 (1997-05) method;
- and
- e) the material has a free formaldehyde content of less than 5 ppm as determined using the JM 112;
- 1973 method.
6 more elements
Dependencies are inferred from the claim text.