Reduced formaldehyde nonwoven binders which contain polymerized units of N-methylolacrylamide
AssigneeAir Products Polymers, L.P.
InventorsJoel Erwin Goldstein, Christian Leonard Daniels, Chung-Ling Mao
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Abstract
The invention is the use of a glycolic acid adduct of sodium sulfite as the reducing agent in the redox couple for polymerization of vinyl acetate polymer based emulsions for nonwoven binders which contain formaldehyde, primarily from the self-crosslinking co-monomer N-methylolacrylamide.
Claims7
In a vinyl acetate based polymer emulsion formed by the emulsion polymerization of vinyl acetate and N-methylolacrylamide, optionally other monomers, in the presence of a stabilizing system and a redox catalyst system comprised of an oxidizing agent and a reducing agent, the improvement for reducing formaldehyde emissions in the resulting vinyl acetate based polymer emulsion, which comprises:
- forming said vinyl acetate based polymer emulsion utilizing as the reducing component of the redox catalyst system a reducing agent of the formula:
- where M is a hydrogen atom, an ammonium atom a monovalent metal ion or an equivalent of a divalent metal ion, R1 is OH or NR4R5 wherein R4 and R5 each are H or C1-Calkyl;
- R2 is H or an alkyl, alkenyl, cycloalkyl or aryl and R3 is CO2M.
Dependencies are inferred from the claim text.