| 摘要 |
<p>1,256,761. Compositions containing polyvinyl alcohol and polyacrylic acid. CELANESE CORP. 21 July, 1969 [24 July, 1968], No. 36513/69. Heading C3P. [Also in Division D1] A sizing composition for yarns of nylon, polyester, polyacrylics and cellulose acetate is prepared by slurrying polyvinyl alcohol in water at a temperature of from 10‹ to 30‹ C. for 10-20 minutes, adding polyacrylic acid and heating the mixture to a temperature of from 65‹ to 85‹ C. adding water-soluble pine oil (stabilizer) and then cooking the combined mixture at a temperature of from 75‹ to 95‹ C. for 20-40 minutes. The polyvinyl alcohol should have a viscosity of from 15 to 25 centipoises and a degree of hydrolysis of from 84 to 100%, and the acrylic acid a molecular weight between 25,000 and 100,000. Conventional additives such as flame retardants, softeners, penetrants and plasticizers may be incorporated in the composition.</p> |
