Mat and gypsum boards suitable for wet or humid areas
AssigneeAhlstrom Oyj
InventorsEmmanuel Faynot, Marc Berlioz, Samuel Merlet, Claude Leclercq
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Abstract
The invention relates to a fibrous mat facer for preparing a gypsum board, to a gypsum board comprising said mat facer and to a system comprising said gypsum board. The fibrous mat comprises at least one ply of a non-woven fabric, and a binder composition, wherein the binder composition represents from 10 to 40 wt % of the total weight of the mat. The binder composition comprises a copolymer comprising a co-monomer unit of a vinyl ester of an alpha branched aliphatic monocarboxylic acid, said copolymer being present in an amount from 25 to 100 wt % of the binder composition weight.
Claims33
A fibrous mat for a gypsum board comprising at least one ply of a non-woven fabric and a binder composition impregnated therein, wherein:
- said binder composition represents from 10 to 40 wt % of the total weight of the mat;
- said binder composition comprises a copolymer comprising a co-monomer unit of a vinyl ester of an alpha branched aliphatic monocarboxylic acid and an acrylic co-monomer, wherein the co-monomer unit of a vinyl ester of an alpha branched aliphatic monocarboxylic acid is present in an amount of 40 to 70 wt % of the copolymer and the acrylic co-monomer is present in an amount of 34 to 60 wt % of the copolymer;
- and
- said copolymer being present in an amount from 50 to 100 wt % of the binder composition weight;
- wherein the fibrous mat is a facer of the gypsum board.
Dependencies are inferred from the claim text.