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

• US 3,874,987 A
• Filed: 03/13/1974
• Issued: 04/01/1975
• Est. Priority Date: 03/13/1974
• Status: Expired due to Term

• Current Assignee: Warren L. Young
• Original Assignee: Warren L. Young
• Inventors: Young, Warren L.
• Primary Examiner(s): Van Balen, William J.
• Application Number:
  US05/450,628
• Time in Patent Office: 384 Days
• Field of Search: 161/160,161,165,254 220/26E 156/306,309
• US Class Current: 428/319.7
• CPC Class Codes: B01J 19/16 Preventing evaporation or oxidation of non-metallic liquids by applying a floating layer, e.g. of microballoons in storage tanks B65D90/42
• CPC Class Codes: B32B 2323/04 Polyethylene
• CPC Class Codes: B32B 27/00 Layered products comprising a layer of synthetic resin fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B65D 88/34 having floating covers, e.g. floating roofs or blankets venting means B65D90/34
• CPC Class Codes: Y10T 428/249992 Linear or thermoplastic
• CPC Class Codes: Y10T 428/266 of base or substrate
• CPC Class Codes: Y10T 428/3192 Next to vinyl or vinylidene chloride polymer

Abstract

A laminate structure consisting essentially of (A) a substantially moisture impervious polyethylene foam underlayer in combination with (B) a covering layer of a suspension chlorinated substantially linear polyethylene said covering layer being characterized by inherent flexibility, solvent weldability and excellent resistance to weathering; said laminate structure being particularly useful as a floating cover for liquid storage reservoirs.

Claims

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.

2. The laminate structure of claim 1 wherein said covering layer is laminated to said polyethylene foam underlayer while said covering layer is maintained at a temperature of at least about 40*F above the melting point of said polyethylene foam underlayer while using a lamination pressure of from about 0.2 to about 10 psi.

3. The laminate structure of claim 2 wherein said chlorinated polyethylene contains at least about 40 percent chlorine.