| 摘要 |
(1) Joint sealing cpds. (I) with early rain resistance are claimed, contg. aq. polymer dispersions (II), non-ionic cellulose ethers (III) (hydroxyethyl-, hydroxyethylmethyl-, hydroxypropylmethyl- or hydroxypropyl-cellulose), fillers and possibly conventional additives, such as pigments, plasticisers, extenders, thickeners, foam suppressants, dispersants, pH regulators, preservatives and anti-ageing additives, and produced by mixing (II) with the other components. (III) is added and mixed in retarded form as a mixt. with the fillers. (2) Process comprises adding a fine dispersion of (III) in the filler to the polymer dispersion (II), mixing thoroughly, and then adding the pH regulators (esp. bases); the other additives are incorporated before and/or after addn. of the filler as required. (I) contain 25-90 wt.% (I) (pref. 25-40 wt.% in highly-filled prods.), 2-60 (pref. 35-60) wt.% filler, 0-1 (pref. 0.3-0.5) wt.% wetting agent, 0-20 (pref. 5-15) wt.% plasticiser, 0-10 (pref. 4-6) wt.% other additives (e.g.thickeners, foam suppressants and pigments) and up to 1.5 wt.% (III)). |
