Plastic impregnated paper and method and apparatus for making same

Claim 1

A PLASTIC IMPREGNATED PAPER, SAID BEING TAKEN FROM THE GROUP CONSISTING OF BLEACHED AND UN BLEACHED SULFITE AND SULFATE PAPERS OF NORTHERN AND SOUTHERN PINE, SAID PLASTIC BEING A FULLY POLYMERIZED IMPREGNATING AGENT SAID IMPREGNATING AGENT COMPFISING A RESIN CONSISTING ESSENTIALLY OF ABOUT 50% TO 90% OF THE CONDENSATION PRODUCT OF BIS-PHENOL-A AND EPICHLORHYDRIN HAVING AN EPOXY EQUIVALENT OF FROM ABOUT 44 TO ABOUT .48 MOL PER 100 GRAMS AND A VISCOSITY OF FROM ABOUT 4,000 TO ABOUT 90,000 CENTIPOISES AT ABOUT 73*F., AND ABOUT 10% TO 50% OF A MONOMER HAVING REACTIVE EPOXY GROUPS; SAID AGENT FURTHER COMPRISING AN ANHYDRIDE HAVING A SIDE GROUP TAKEN FROM THE CLASS CONSISTING OF AROMATICS AND ALIPHATICS CONTAINING 4 TO 18 CARBON ATOMS, SAID ANHYDRIDE BEING PRESENT IN SUCH QUANTITY AS TO PROVIDE AN ANHYDRIDE BEING PRESENT IN GROUP RATIO OF ABOUT 1;1; AND ABOUT 1 TO 2 PARTS PF A TEMPERATURE LATENT AMINE FOR ABOUT EVERY 100 PARTS OF SAID RESIN SAID PLASTIC BEING SUBSTANTIALLY UNIFORMLY DISTRIBUTED THROUGHOUT SAID PAPER AND CONSTITUTING FROM ABOUT 8% TO 11% BY WEIGHT OF SAID IMPREGNATED PAPER SAID PLASTIC IMPREGNATED PAPER CONTAINING FROM ABOUT 4 1/2 TO 5 1/2% WATER, THIS WATER BEING UNIFORMLY DISTRIBUTED THROUGHOUT SAID PAPER.