| 摘要 |
<p>A carrier material comprising cellulose fibers and mineral fibers in a weight ratio of from 3:7 to 10:1 and impregnated with a dimension-stabilizing water-soluble alkylene oxide adduct having the general formula …<CHEM>… wherein R1 is a hydrocarbon residue or a hydroxy-substituted hydrocarbon residue free from primary hydroxy groups, the hydrocarbon residue containing from 1 to 24 carbon atoms, G is a hydroxyalkyl group derived from propylene oxide and/or butylene oxide, each A is an oxyalkylene group derived from alkylene oxide containing from 2 to 4 carbon atoms, m is a number from 1 to 6 inclusive, and x being selected in such a way that the total number of A is a number from 2 to 200 inclusive. The impregnation can be carried out in a way known per se of a formed web of cellulose fibers and mineral fibers. A good dimension stability is imparted to the carrier material at the same time as the dimension-stabilizing compound has a low tendency of thermal decomposition and chemical reactivity. …<??>It is suitable to coat the carrier material with a plastic material, the carrier material being subjected to increased temperature during some stage of the coating procedure.</p> |
