| 摘要 |
PURPOSE:To improve the rate of production of polyurethane moldings by decreasing the number of molding operations, by feeding a reaction mixture comprising an organic polyisocyanate, a polyol, a crosslinking agent, a catalyst and a specified internal releasing agent to a molding die. CONSTITUTION:A polyurethane molding is produced by feeding a reaction mixture comprising an organic polyisocyanate, a polyol, a crosslinking agent, a catalyst and the following internal releasing agent and, optionally, a blowing agent and an aid to a molding die pre-coated with an external releasing agent. Examples of the above releasing agents include fatty acid esters of an HLB (hydrophilic/lipophilic balance) of 10-20, obtained from a reaction among oleyl alcohol, isostearyl alcohol, a higher fatty acid and a glycol, fatty acid ethers of an HLB of 8-15, obtained by a reaction between a higher alcohol and a glcyol, a reaction product between oleic acid and an organic polyisocyanate, or mixtures thereof. |
