| 摘要 |
A process is described for the production of a carrier web of a spun bond consisting of synthetic polyester filaments having a melting point of more than 230 DEG C and a filament titer of approximately 3 to 15 dtex. To this spun bond, a chemical binder is applied in the form of an aqueous dispersion which is dried at approximately 120 DEG to 220 DEG C. The dispersion consists of (A) 10 TO 60% BY WEIGHT OF A COPOLYMER OF 60 TO 90% BY WEIGHT OF STYRENE, 5 TO 20% BY WEIGHT OF BUTADIENE, 2 TO 10% BY WEIGHT OF ACRYLIC ACID AND 2 TO 10% BY WEIGHT OF ACRYLAMIDE, (B) 5 TO 30% BY WEIGHT, CALCULATED ON THE AMOUNT OF COPOLYMER, OF A MELAMINE FORMALDEHYDE PRECONDENSATE, (C) A CATALYTIC AMOUNT OF ACID CATALYSTS, AS WELL AS, OPTIONALLY, (D) FURTHER INERT ADDITIVES. |
