Claims
- 1. A rigid metal-resin-metal sandwich laminate capable of withstanding 180.degree. bending with a threshold bending inner diameter of zero, said laminate comprising a resin layer sandwiched between and bonded to outer metal layers, characterized in that the resin layer is comprised of a core sheet sandwich between outer resin sheets, said core sheet being made of a resin which exhibits plastic behavior and which is bonded to said outer resin sheets with or without an adhesive layer and said outer resin sheets being made of a ductile resin which does not exhibit yielding behavior or necking when stretched, and said outer resin sheet being made of a copolymer or polymeric blend of a lower .alpha.-olefin selected from ethylene and propylene with from about 15% to about 50% by weight for ethylene or from about 20% to about 85% by weight for propylene based on the copolymer or blend of one or more .alpha.,.beta.-ethylenically unsaturated monomers.
- 2. The rigid metal-resin-metal sandwich laminate according to claim 1 wherein said monomer is present in an amount of at least 40 wt % for propylene.
- 3. The rigid metal-resin-metal sandwich laminate according to claim 2 wherein said outer layer is made of a copolymer of ethylene with from about 15% to about 30% by weight of acrylic acid or methacrylic acid.
- 4. A rigid metal-resin-metal sandwich laminate capable of withstanding 180.degree. bending with a threshold bending inner diameter of zero, said laminate comprising a resin layer sandwiched between and bonded to outer metal layers, characterized in that the resin layer is comprised of a core sheet sandwiched between outer resin sheets, said core sheet being made of a resin which exhibits plastic behavior and which is bonded to said outer resin sheets with or without an adhesive layer and said outer resin sheets being made of a ductile resin which does not exhibit yielding behavior or necking when strectched, and said outer resin sheet being made of a copolymer or polymeric blend of vinyl chloride with up to about 70% by weight based on the copolymer or blend of one or more .alpha.,.beta.-ethylenically unsaturated monomers, or a blend of poly(vinyl chloride) with up to about 50% by weight based on the blend of one or more plasticizers.
- 5. A rigid metal-resin-metal sandwich laminate capable of withstanding 180.degree. bending with a threshold bending inner diameter of zero, said laminate comprising a resin layer sandwiched between and bonded to outer metal layers, characterized in that the resin layer is comprised of a core sheet sandwiched between outer resin sheets, said core sheet being made of a resin which exhibits plastic behavior and which is bonded to said outer resin sheets with or without an adhesive layer and said outer resin sheets being made of a ductile resin which does not exhibit yielding behavior or necking when stretched, and said outer resin sheet being made of elastomeric resins selected from polyurethanes, chlorosulfonated polyethylene and rubbers.
- 6. The rigid metal-resin-metal sandwich laminate according to claim 1 wherein the outer metal layers are steel sheets each having a corrosion-resistant coating on at least the surface facing the resin core layer.
- 7. The rigid metal-resin-metal sandwich laminate according to claim 6 wherein the steel sheets are cold rolled steel sheets.
- 8. The rigid metal-resin-metal sandwich laminate according to claim 6 wherein the corrosion-resistant coating on each steel sheet is formed by electrolytic chromate treatment, Ni--Zn alloy plating or Fe--Zn alloy plating.
- 9. The rigid metal-resin-metal sandwich laminate according to claim 1 wherein the core sheet of the resin layer is made of a resin which exhibits both plastic and yielding behavior.
- 10. An article made of the sandwich laminate defined in claim 1.
- 11. A rigid metal-resin-metal sandwich laminate capable of withstanding 180.degree. bending with a threshold bending inner diameter of zero, said laminate comprising a resin layer sandwiched between and bonded to outer metal layers, characterized in that the resin layer is comprised of a core sheet sandwiched between outer resin sheets, said core sheet being made of a resin which exhibits plastic behavior and which is bonded to said outer resin sheets with or without an adhesive layer and said outer resin sheets being made of a ductile resin which does not exhibit yielding behavior or necking when stretched, and said ductile resin being selected from a copolymer or polymeric blend of ethylene or propylene with one or more .alpha.,.beta.-ethylenically unsaturated monomers, a copolymer or polymeric blend of vinyl chloride with one or more .alpha.,.beta.-ethylenically unsaturated monomers, a blend of poly(vinyl chloride) with one or more plasticizers, and elastomeric resins.
- 12. The rigid metal-resin-metal sandwich laminate according to claim 11 wherein the core sheet of the resin layer is comprised of a resin material selected from polyethylene, polypropylene, poly(4-methylpentene-1), poly(vinyl chloride), ABS resin, fluorocarbon resins, polyamides, polyesters, polycarbonates, polyacetals, acrylic resins and copolymers thereof.
- 13. The rigid metal-resin-metal sandwich laminate according to claim 12 wherein the core sheet of the resin layer is comprised of a resin material selected from polyethylene, polypropylene, poly(4-methylpentene-1), polyamides and polyesters.
- 14. The rigid metal-resin-metal sandwich laminate according to claim 11 wherein each outer resin sheet has a thickness of at least 1 .mu.m.
- 15. An article made of the sandwich laminate defined in claim 11 through working including bending forming.
- 16. An article made of the sandwich laminate defined in claim 11 through working including 180.degree. bending.
CROSS-REFERENCES TO RELATED APPLICATIONS
This is a continuation-in-part application of U.S. Ser. No. 458,944 filed Jan. 18, 1983 now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4313996 |
Newman et al. |
Feb 1982 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
458944 |
Jan 1983 |
|