| 摘要 |
<p>Process for the removal of flat or undulated sheets or articles from moulds in which the mould surface is coated with a film of biaxially stretched polyethylene terephthalate and on this polyethylene terephthalate film are coated organopolysiloxane coatings. These are prepd. by treating the polyethylene terephthalate with a soln. or emulsion cont. 1 to 15 pts., wt. linear poly Me siloxane hacing SiH or SiH2 bonds, 100 pts. wt. gummy or oily dimethyl polysiloxane blocked at the chain ends by -OH or -SiMe3 grps., 2 to 15 pts. of org. Si compd. chosen from either alkyl silicates, Me trialkoxy silanes or Me silica resin having Me/Si ratio of 1:1.7, and 0.5 to 5 pts. of catalyst such as Sn, Zn, Co etc. salt.</p> |
