| 摘要 |
Non-woven webs are impregnated with 15-60wt% of a composition comprising a latex containing 30-65wt% of one of three defined types of copolymer each containing units of a carboxylic acid or anhydride monomer, the latex being neutralised to pH5-9 by an alkali metal base. A copolymer of styrene/butadiene/acrylic acid is used in examples. The composition may also contain a latent acid, e.g. NH4Cl. |
