| 摘要 |
Leather is coated on at least one face with a curable composition comprising I. A POLYMERCAPTAN CONTAINING AT LEAST TWO MERCAPTAN GROUPS PER AVERAGE MOLECULE, II. A POLYENE HAVING, PER AVERAGE MOLECULE, AT LEAST TWO ETHYLENIC DOUBLE BONDS, EACH beta TO AN ATOM OF NITROGEN, SULFUR, OR OXYGEN, THE SUM OF THE MERCAPTAN GROUPS IN THE POLYMERCAPTAN AND OF SUCH ETHYLENIC DOUBLE BONDS IN THE POLYENE BEING MORE THAN 4, AND THE COMPOSITION IS THEN CURED ON THE LEATHER WITH OR WITHOUT THE APPLICATION OF HEAT, OPTIONALLY IN THE PRESENCE OF A Bronsted acid, a Bronsted base, or a source of free radicals, as a curing accelerator.
|
