Trail addition of acrylamidobutyraldehyde dialkyl acetal-type monomers during the polymerization of vinyl acetate copolymer binders
US4647611A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1986 |
| Grant date | Mar 3, 1987 |
| Priority date | — |
| Expiry date | Mar 12, 2006 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD04H1/64
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In a process for preparing a nonwoven binder emulsion containing a crosslinkable vinyl acetate or vinyl acetate/ethylene copolymer prepared by polymerizing in an aqueous dispersion vinyl acetate or vinyl acetate and ethylene with a crosslinkable comonomer of formula I EQU R--NH--(CH.sub.2).sub.n --CH(OR.sup.1).sub.2 (I) wherein R is a C.sub.3 -C.sub.10 olefinically unsaturated radical having functionality which renders the nitrogen atom electron deficient, the olefinic unsaturation functionality being polymerizable, R.sup.1 is hydrogen or a C.sub.1 -C.sub.4 alkyl group and n is 3 or 4, the method for improving the wet tensiles of such copolymer which comprises PA2 (1) polymerizing vinyl acetate in an aqueous dispersion reaction medium, optionally under an ethylene pressure, PA2 (2) commencing the addition of 0.5 to 15 wt % of a crosslinkable comonomer of formula I to the reaction mixture when about 50-80% of the total vinyl acetate in the polymerization recipe has been polymerized, and PA2 (3) completing addition of the crosslinkable comonomer after the completion of the addition of the vinyl acetate to the reaction mixture and substantially with the finishing of vinyl acetate poly…
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