Nonwoven products bonded with binder emulsions of copolymers of

Details Nonwoven products bonded with binder emulsions of copolymers of Nonwoven products bonded with binder emulsions of copolymers of

1989-02-01

1990-12-04

Cannon, James C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

1621683, 1621687, 427394, 427396, 428290, 428507, 428510, 428522, D04H 164, D21H 1737, D21H 1745

Patent

active

049753207

ABSTRACT:
A two stage polymerization process for preparing a vinyl acetate/ethylene emulsion copolymer containing a monomer which is normally incompatible with vinyl acetate. In the first stage the vinyl acetate and ethylene and, optionally, an active crosslinking comonomer and/or latent crosslinking comonomer are free radical polymerized in the presence of a stabilizing system to yield a first stage polymer emulsion. When the free vinyl acetate monomer content of the first stage emulsion is less than about 5%, the second stage polymerization begins by adding the incompatible monomer. Preferably, there is no cessation of the addition of the free radical source during the transition from the first stage to the second stage polymerization. No additional stabilizing system is added to the reaction in the second stage.
Vinyl acetate/ethylene/incompatible comonomer/latent crosslinking comonomer copolymers prepared by the two stage polymerization process are suitably used as binders for making nonwoven products.

REFERENCES:
patent: 4605589 (1986-08-01), Orphanides
patent: 4616059 (1986-10-01), Lindemann
patent: 4683165 (1987-07-01), Lindemann
patent: 4743498 (1988-05-01), Kedrowski et al.
patent: 4774283 (1988-09-01), Goldstein
patent: 4808660 (1989-02-01), Schmeing et al.

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