| abstract |
The present invention provides a polymer-modified aqueous urea formaldehyde resin (UF resin) binder composition useful in making treated glass mats, for example for roofing sheets, the polymer modifier containing phosphate groups. A multi-stage aqueous emulsion acorn copolymer comprising one protruding polymer stage and one or more other polymer stages including additional copolymers that are incompatible with the protruding polymer stage, the multi-stage aqueous emulsion The copolymer has a measured Tg of −60 to 25 ° C., or preferably −30 to 12 ° C., and further comprises a total of monomers used to make one or more other polymer stages, and a protruding polymer stage The weight ratio with respect to the total amount of monomers used to make is 3: 1 to 50: 1, or preferably 3: 1 to 30: 1, or more The Mashiku 3: 1 to 20: 1 or even more preferably, 8: 1 to 12: 1. [Selection figure] None |