INJECTION-MOLDED MULTI-COMPONENT COMPOSITE SYSTEMS HAVING IMPROVED FIRE BEHAVIOUR
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Abstract
The present invention provides entirely or partially injection-moulded multi-component composite systems having improved fire behaviour and a process for their production.
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Citations
22 Claims
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1-11. -11. (canceled)
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12. An entirely or partially injection-moulded multi-component composite system having wall thickness a b, containing at least one component A in a thickness a and at least one component B in a thickness b, wherein
component A) is a back-moulded thermoplastic film or at least one layer of an injection-moulded thermoplastic, the thickness of the film or the thickness of one layer or, in the case of several layers, the total thickness of the layers made from component A being the thickness a, and component B) is at least one layer of an injection-moulded thermoplastic, the thickness of one layer or, in the case of several layers, the total thickness of the layers made from component B being the thickness b, and wherein components A and B satisfy one of the following criteria: -
(1) component A achieves at least V2 in thickness a and only HB in thickness a b, component B achieves V2 in thickness b and V0 or V1 in thickness a b, and the ratio a;
b is ≦
2.5;(2) component A achieves only HB in thickness a and in thickness a b, component B achieves V0 or V1 in thickness a b, and the ratio a;
b is ≦
0.3;
or(3) at least one of components A or B achieves only V2 in thickness a or b respectively and both components achieve V0 or V1 in thickness a b.
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13. The multi-component composite system of claim 12, wherein component A achieves at least V2 in thickness a and only HB in thickness a b, component B achieves V2 in thickness b and V0 or V1 in thickness a b, and the ratio a:
- b is ≦
2.5.
- b is ≦
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14. The multi-component composite system of claim 12, wherein component A achieves only HB in thickness a and in thickness a b, component B achieves V0 or V1 in thickness a b, and the ratio a:
- b is ≦
0.3.
- b is ≦
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15. The multi-component composite system of claim 12, wherein at least one of components A or B achieves only V2 in thickness a or b respectively and both components achieve V0 or V1 in thickness a b.
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16. The multi-component composite system of claim 12, wherein component A and component B consist of injection-moulded thermoplastics.
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17. The multi-component composite system of claim 12, wherein the composite system is a back-moulded film and the film constitutes component A.
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18. The multi-component composite system of claim 12, wherein at least one of components A and B contains polycarbonate, copolycarbonate or copolyester carbonate.
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19. The multi-component composite system of claim 12, wherein at least component B contains at least one flame retardant.
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20. A process for producing an entirely or partially injection-moulded multi-component composite system, comprising the steps of:
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a. selecting suitable materials for components A and B such that they satisfy one of the following criteria; 1) component A achieves at least V2 in thickness a and only HB in thickness a b, component B achieves V2 in thickness b and V0 or V1 in thickness a b, and the ratio a;
b is ≦
2.5;2) component A achieves only HB in thickness a and in thickness a b, component B achieves V0 or V1 in thickness a b, and the ratio a;
b is ≦
0.3;
or3) at least one of components A or B achieves only V2 in thickness a or b respectively and both components achieve V0 or V1 in thickness a b; and b. producing an entirely or partially injection-moulded composite system by two-component or multi-component injection moulding processes, by back-moulding a film consisting of component A with component B, or by coating an injection-moulded part consisting of component B with a coating containing component A.
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21. The process of claim 20, wherein the production process in step b) is a two-component or multi-component injection-moulding process.
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22. The process of claim 20, wherein the production process in step b) is the back-moulding of a film consisting of component A with component
Specification