| 摘要 |
A material comprises a support sheet having a weight of 4-7 pounds per 3000 square feet and a thickness of 0,8-2 mils coated with a layer comprising from 50-100% of a wax melting between 160 DEG F. and 210 DEG F. and with a hardness of 0-20, from 0-50% of paraffin wax and from 0-5% of a wax-soluble polymer. The coating is usually applied to the sheet in an amount from 4-10 pounds per 3000 square feet. The support sheet is composed of long fibres such as abaca or a synthetic organic fibre. Specified wax-soluble polymers are the copolymers of vinyl acetate and vinyl stearate, ethylene and vinyl acetate, and ethylene and ethyl acrylate. Specifications 777,819 and 810,863 are referred to. |
