Reinforced polymeric composites

• US 4,925,719 A
• Filed: 05/05/1989
• Issued: 05/15/1990
• Est. Priority Date: 04/08/1988
• Status: Expired due to Fees

• Current Assignee: Centrite Corporation
• Original Assignee: Centrite Corporation
• Inventors: Rodenbeck, Donald L., Staneluis, James M.
• Primary Examiner(s): VAN BALEN, WILLIAM
• Application Number:
  US07/348,214
• Time in Patent Office: 375 Days
• Field of Search: 428/71, 428/86, 428/109, 428/113, 428/114, 428/284, 428/285, 428/286, 428/294, 428/295, 428/309.9, 428/317.9
• US Class Current: 428/71
• CPC Class Codes: B29C 37/0082 Mechanical anchoring B29C66/303 takes precedence
• CPC Class Codes: B29C 44/326 Joining the preformed parts, e.g. to make flat or profiled sandwich laminates
• CPC Class Codes: B29C 70/081 Combinations of fibres of continuous or substantial length and short fibres
• CPC Class Codes: B29C 70/086 and with one or more layers of pure plastics material, e.g. foam layers applying a non-preformed coating, e.g. a gel-coat, B29C37/0025; with foam blocks B29C70/86
• CPC Class Codes: B29C 70/508 and first forming a mat composed of short fibres
• CPC Class Codes: B32B 7/04 Interconnection of layers
• CPC Class Codes: E04C 2/205 of foamed plastics, or of plastics and foamed plastics, optionally reinforced
• CPC Class Codes: Y10T 428/233 Foamed or expanded material encased
• CPC Class Codes: Y10T 428/23914 Interlaminar
• CPC Class Codes: Y10T 428/24091 with additional layer[s]
• CPC Class Codes: Y10T 428/24124 Fibers
• CPC Class Codes: Y10T 428/24132 including grain, strips, or filamentary elements in different layers or components parallel
• CPC Class Codes: Y10T 428/24996 With internal element bridging layers, nonplanar interface between layers, or intermediate layer of commingled adjacent foam layers
• CPC Class Codes: Y10T 428/249986 Void-containing component contains also a solid fiber or solid particle

Abstract

A high strength reinforced composite has an outer polymeric skin and an inner polymeric foam core chemically and mechanically bonded together at a high modulus, three dimensional interface comprising longitudinally continuous strands, transversely continuous and randomly arrayed transverse strands, and randomly inclined short strands having end portions embedded in both the skin and the core.

Claims

1. A reinforced polymeric composite, comprising:

a foam core of a first polymeric composition;

a skin surrounding said core of a second polymeric composition;

a three dimensional interface chemically and mechanically bonding said core to said skin comprising strands of a high modulus material including continuous longitudinal strands substantially uniformly peripherally spaced about the outer surface of said core and the inner surface of said skin, continuous transverse strands substantially uniformly spaced along the length of said core adjacent to said longitudinal strands, a transverse layer of first chopped strands randomly contacting said longitudinal strands and said transverse strands, and second chopped strands inclined with respect to said core.

2. The composite recited in claim 1 wherein third chopped strands are randomly dispersed within said core.

3. The composite recited in claim 2 wherein said third chopped strands have a length of around one inch to two and one half inch.

4. The composite recited in claim 1 wherein said first polymeric composition is formed by a reactant mixture of a non-volatile liquid monomer, a surfactant and a catalytic system.

5. The composite recited in claim 4 wherein said non-volatile liquid monomer is selected from the group consisting of polyurethanes, polyesters, polyamide, epoxies and acrylics.

6. The composite recited in claim 1 wherein said first and second chopped strands are deposited between about 0.02 pounds per square foot and 0.88 pounds per square foot.

7. The composite recited in claim 1 wherein said first polymeric composition comprises a rigid polyol composition including a reactant mixture of a polyol and isocyanate together with sufficient catalyst to effect a rigid skin upon curing.

8. The composite recited in claim 1 wherein said second polymeric composition comprises a polyol, a filler, a blowing agent and catalyst in sufficient proportions to effect a rigid foam composition upon curing.