Laminate of a moisture impervious polyethylene foam and a suspension chlorinated polyethylene sheet

Claim 1

A LAMINATE STRUTURE CONSISTING ESSENTIALLY OF (A) A SUBSTANTIALLY MOISTURE IMPERVIOUS POLYETHYLENE FOAM UNDERLAYER IN COMBINATION WITH (B) A COVERING LAYER OF A SHEET OF CHLORINATED ETHYLENE POLYMER PREPARED BY THE SUSPENSION CHLORINATION OF AN ETHYLENE POLYMER HAVING A ESSENTIALLY LINEAR STRUCTURE, SAID ETHYLENE POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE AND INTERPOLYMERS COMPOSED OF AT LEAST ABOUT 90 MOLE PERCENT ETHYLENE WITH ANY REMAINDER BEING AT LEAST ONE ETHYLENICALLY UNSATURATED COMONOMER WHEREIN SAID ETHYLENE POLYMER IS FIRST CHLORINATED AT A TEMPERATURE BELOW ITS AGGLOMERATION TEMPERATURE UP TO A CHLORINE CONTENT OF FROM ABOUT 2 TO 23 PERCENT CHLORINE BASED ON THE WEIGHT OF SAID ETHYLENE POLYMER, FOLLOWED BY THE SEQUENTIAL SUSPENSION CHLORINATION OF SUCH POLYMER I A PARTICULATE FORM AT A TEMPERATURE ABOVE ITS AGGLOMERATION TEMPERATURE BUT AT LEAST ABOUT 2*C BELOW ITS CRYSTALLINE MELTING POINT AND WHEREIN THE CHLORINATION PRODUCT IS CHARACTERIZED BY REGIONS IN WHICH A MINOR PORTION OF THE CHLORINE ATOMS ALONG THE POLYMER CHAIN ARE DISTRIBUTED IN A NON-STATISTICAL BLOCK TYPE FASHION WHILE THE REMAINDER OF THE POLYMER IS CHLORINATED IN A RANDOM MANNER CHARACTERISTIC OF CHLORINATION PRODUCTS OBTAINED BY SOLUTION CHLORINATION TECHNIQUES, SAID CHLORINATED ETHYLENE POLYMER CONTAINING FROM ABOUT 35 TO ABOUT 50 WEIGHT PERCENT OF CHEMICALLY COMBINED CHLORINE AND HAVING A RELATIVE CRYSTALLINITY OF LESS THAN ABOUT 10 PERCENT, SAID SHEET HAVING A THICKNESS OF AT LEAST ABOUT 0.01 OF AB INCH, A TENSILE STRENGTH OF AT LEAST ABOUT 1000 POUNDS PER SQUARE INCH, AN ELONGATION OF BETWEEN ABOUT 200 AND 1000 PERCENT AND A 100 PERCENT MODULUS OF BETWEEN ABOUT 150 POUNDS PER SQUARE INCH.