US 12,448,549 B2
VAE dispersion for D3 wood adhesives
Frank Bertram Polzer, Frankfurt (DE); and Daniela Hardt, Sulzbach (DE)
Assigned to Celanese International Corporation, Irving, TX (US)
Filed by Celanese International Corporation, Irving, TX (US)
Filed on Feb. 10, 2022, as Appl. No. 17/668,680.
Claims priority of provisional application 63/148,742, filed on Feb. 12, 2021.
Prior Publication US 2022/0267651 A1, Aug. 25, 2022
Int. Cl. C09J 133/10 (2006.01); C09J 11/06 (2006.01); C09J 123/08 (2006.01); C09J 129/04 (2006.01); C09J 131/04 (2006.01); C09J 133/08 (2006.01)
CPC C09J 131/04 (2013.01) [C09J 11/06 (2013.01); C09J 123/0815 (2013.01); C09J 129/04 (2013.01); C09J 133/08 (2013.01); C09J 133/10 (2013.01)] 20 Claims
 
1. An adhesive composition comprising an aqueous copolymer dispersion comprising:
at least one copolymer of at least one vinyl ester of a C1-13 alkanoic acid co-monomer, at least one alpha-olefin co-monomer, and at least one auxiliary co-monomer selected from the group consisting of N-alkylol-containing co-monomers, unsaturated silane co-monomers, glycidyl ether/epoxy co-monomers, cyclic ureido co-monomers, acrylamido glycolic acid co-monomers, and combinations thereof; and
at least one stabilizer selected from the group of polyvinyl alcohols, wherein the group of polyvinyl alcohols comprise a first group of polyvinyl alcohols having a degree of hydrolysis greater than 90 mol % and a second group of polyvinyl alcohols having a degree of hydrolysis equal to or less than 90 mol %, wherein the first group of polyvinyl alcohols having a degree of hydrolysis greater than 90 mol % has a viscosity from 2 mPa*s to 35 mPa*s;
wherein the copolymer dispersion comprises, based on dried polymer, from 60 to 95 wt % of the C1-13 alkanoic acid, from 1 to 35 wt % of the alpha-olefin, and from 0.1 to 5 wt % of the at least one auxiliary co-monomer, and from 0.5 to 20 wt % of the at least one stabilizer; and
wherein the copolymer dispersion has a viscosity from 2000 mPa*s to 30,000 mPa*s at 25 to 65% solids;
wherein the adhesive composition has an MFFT lower than 15° C., a D3-3 bond strength greater than 2 N/mm2 according to DIN EN 204:2016, and a bond strength greater than 4 N/mm2 according to DIN EN 14257:2019 (WATT91).