| 摘要 |
<p>A product based on a polyvinyl chloride and the process of producing the product, where the product is to be used for filling hollow bodies in situ. The product is mixed and pregelled by a known method in a plastic processing machine. During this part of the process the blowing agent in the product is not decomposed. The decomposition of the blowing agent occurs only in an autoclave using a temperature- and pressure-exchanging, barrier-forming medium. After the decomposition of the blowing agent has been completed, a colder medium is introduced into the autoclave to cool the product to a temperature lower than its second order transition temperature, Tg. The product can then be converted to foam material by heating in situ at the expansion site.</p> |
