| 摘要 |
A method is disclosed for casting a colorless, single phase liquid reaction mixture comprising an aliphatic diisocyanate and a polyester polyol against a rigid transparent plastic and curing at a sufficiently rapid rate at temperatures of about 175 DEG to 275 DEG F. (about 79 DEG to 135 DEG C.) to form a relatively soft, resilient, abrasion resistant branched polyurethane coating without warpage or deterioration of the rigid plastic. The polyesterurethane coatings disclosed are characterized by durometer values at 70 DEG F. between Shore A 50 and Shore D 80, and molecular weights between branch points between 1000 and 13,000.
|
