Film/fiber laminates

• US 4,748,070 A
• Filed: 03/24/1986
• Issued: 05/31/1988
• Est. Priority Date: 03/24/1986
• Status: Expired due to Term

• Current Assignee: Hercules Incorporated (Ashland Global Holdings, Inc.)
• Original Assignee: Hercules Incorporated (Ashland Global Holdings, Inc.)
• Inventors: Beehler, David C.
• Primary Examiner(s): Kittle, John E.
• Assistant Examiner(s): SCHWARTZ, PAMELA R
• Application Number:
  US06/842,971
• Time in Patent Office: 799 Days
• Field of Search: 428/340, 428/286, 428/516, 428/910, 428/198, 156/290
• US Class Current: 428/198
• CPC Class Codes: B32B 2262/0253 Polyolefin fibres
• CPC Class Codes: B32B 2305/38 Meshes, lattices or nets
• CPC Class Codes: B32B 2307/518 bi-axially
• CPC Class Codes: B32B 2307/5825 Tear resistant
• CPC Class Codes: B32B 2307/7246 Water vapor barrier
• CPC Class Codes: B32B 2323/10 Polypropylene
• CPC Class Codes: B32B 2439/70 Food packaging
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 5/022 Non-woven fabric
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 428/24826 Spot bonds connect components
• CPC Class Codes: Y10T 428/27 Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
• CPC Class Codes: Y10T 428/31913 Monoolefin polymer
• CPC Class Codes: Y10T 442/678 Olefin polymer or copolymer sheet or film [e.g., polypropylene, polyethylene, ethylene-butylene copolymer, etc.]

Abstract

Tear strength of biaxially oriented polypropylene film is increased by laminating thereto a fibrous web of polypropylene fiber under conditions whereby the orientation of the film is retained.

Claims

1. A high tear strength film comprised of a base film of biaxially oriented polypropylene having on one of its surfaces a layer of a lower melting polymer and, thermally bonded to said lower melting polymer layer, and coextensive with the biaxially oriented film, a fibrous polypropylene web, said web being bonded to the lower melting polymer layer in about 10 to 50% of the total surface area of the web.

2. The high tear strength film of claim 1 wherein the fibrous web has a weight of about 10 to 40 grams per square yard.

3. The high tear strength film of claim 2 wherein the fibrous web is a nonwoven polypropylene fabric.

4. The high tear strength film of claim 2 wherein the fibrous web is a polypropylene bonded staple fiber scrim.