| 摘要 |
A clothlike tissue laminate suitable for use as surgical draping, clothing, towelling, tenting and other uses conventionally reserved to woven materials is prepared by impregnating a central layer of tissue with about 250% to about 800%, preferably about 300%, based on the fibrous weight of said center layer of soft, pliable and substantially plasticizer free, tacky, substantially nonmigratory latex binder solids having glass transition temperatures of about 10 DEG C. to about -80 DEG C., preferably about -30 DEG C. and tack tests of about 2 pounds to about 40 pounds, preferably about 7 pounds to about 20 pounds. The latex binder solids are applied to the central tissue layer from high viscosity emulsions having a latex binder solids content, by weight, of about 40% to about 80%. The central impregnated tissue layer is then provided with soft tissue facings and, in one preferred embodiment, is reinforced with essentially unbonded scrim by pocket bonding on the scrim reinforced side prior to mechanical post treatment to result in a laminate with improved clothlike drape and handle. Reinforcement can also be provided by parallel sets of reinforcing strands placed in opposing directions on the opposite sides of the central tissue layer and by bonded scrims whose bonds are ruptured in processing. In other preferred embodiments the tissue layers of the laminate are prepared according to the disclosure of U.S. Pat. No. 3,301,746, issued to Lawrence H. Sanford and James B. Sisson on Jan. 31, 1967, and can be treated for moisture barrier, differential tissue layer dyeing and flame retarding functions. |
