LAMINATES

• US 3,645,837 A
• Filed: 08/14/1970
• Issued: 02/29/1972
• Est. Priority Date: 12/29/1967
• Status: Expired due to Term

• Current Assignee: Douglas S. Chisholm, Walter J. Schrenk
• Original Assignee: Douglas S. Chisholm, Walter J. Schrenk
• Inventors: Chisholm, Douglas S., Schrenk, Walter J.
• Primary Examiner(s): Van Balen, William J.
• Application Number:
  US05/063,839
• Time in Patent Office: 564 Days
• Field of Search: 161/160,161,165,252,254 264/47,171
• US Class Current: 428/316.6
• CPC Class Codes: B29C 44/22 consisting of at least two parts of chemically or physically different materials, e.g. having different densities
• CPC Class Codes: B29C 48/00 Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor extrusion blow-moulding B29C49/04
• CPC Class Codes: B29C 48/07 Flat, e.g. panels
• CPC Class Codes: B29C 48/08 flexible, e.g. films
• CPC Class Codes: B29C 48/21 the layers being joined at their surfaces
• CPC Class Codes: B29C 48/307 specially adapted for bringing together components, e.g. melts within the die
• CPC Class Codes: B29C 48/495 Feed-blocks extrusion moulding of multi-component articles B29C48/16
• CPC Class Codes: B29C 48/705 in the die zone, e.g. to create flow homogeneity
• CPC Class Codes: B29C 48/71 for layer multiplication extrusion of multi-component articles B29C48/16
• CPC Class Codes: Y10T 428/2495 Thickness [relative or absolute]
• CPC Class Codes: Y10T 428/249981 Plural void-containing components
• CPC Class Codes: Y10T 428/249992 Linear or thermoplastic
• CPC Class Codes: Y10T 428/249993 Hydrocarbon polymer
• CPC Class Codes: Y10T 428/266 of base or substrate
• CPC Class Codes: Y10T 428/269 including synthetic resin or polymer layer or component
• CPC Class Codes: Y10T 428/31913 Monoolefin polymer
• CPC Class Codes: Y10T 428/31928 Ester, halide or nitrile of addition polymer

Abstract

Plastic film or sheet having a plurality of layers is formed by deforming a flowing stream having layers of diverse thermoplastic material to provide a sheet or film having a laminar structure. Alternating foamed and unfoamed layers are obtained.

Claims

2. The article of claim 1 wherein there are from about 10 to 1, 000 layers.

3. The article of claim 1 wherein the major surfaces are layers of solid thermoplastic resinous film.

4. The article of claim 1 wherein the solid thermoplastic resinous film has a high elongation before breaking relative to the elongation before breaking of the foam component.

5. The article of claim 4 wherein the solid polymer is polyethylene and the expandable cellular resin is polystyrene.