Metal clad laminated plate and method for manufacturing metal clad laminated plate

Abstract

A metal clad laminated plate is a metal clad laminated plate including: an insulating layer containing a liquid crystal polymer; and a metal foil lying on the insulating layer. The metal foil has a surface lying on the insulating layer. The surface has a mean width of profile elements (RSm) of greater than or equal to 10 μm and less than or equal to 65 μm. The mean width is calculated from a roughness curve obtained from a cross section of the metal clad laminated plate. The metal clad laminated plate has a plate thickness accuracy of less than ±20%. Pull strength of the metal foil from the insulating layer is greater than or equal to 0.8 N/mm.

1 . A metal clad laminated plate, comprising:
 an insulating layer containing a liquid crystal polymer; and   a metal foil lying on the insulating layer,   the metal foil having a surface lying on the insulating layer, the surface having a mean width of profile elements (RSm) of greater than or equal to 10 μm and less than or equal to 65 μm, the mean width being calculated from a roughness curve obtained from a cross section of the metal clad laminated plate,   the metal clad laminated plate having a plate thickness accuracy of less than ±20%,   pull strength of the metal foil from the insulating layer being greater than or equal to 0.8 N/mm.   
     
     
         2 . The metal clad laminated plate of  claim 1 ,
 ten-point average roughness (Rzjis) calculated from the roughness curve is greater than or equal to 0.5 μm and less than or equal to 3 μm.   
     
     
         3 . The metal clad laminated plate of  claim 1 , wherein
 the number of voids which appear between the metal foil and the insulating layer in the cross section is three or less per 10 μm in length in a direction orthogonal to a direction in which the metal foil and the insulating layer face each other.   
     
     
         4 . The metal clad laminated plate of  claim 1 , wherein
 a plate thickness accuracy of the metal clad laminated plate is less than or equal to ±10%.   
     
     
         5 . The metal clad laminated plate of  claim 1 , wherein
 a dimensional stability, defined in IPC-TM650 No. 2.2.4, of the metal clad laminated plate is less than or equal to ±0.1%.   
     
     
         6 . The metal clad laminated plate of  claim 1 , wherein
 the liquid crystal polymer has a melting point of higher than or equal to 300° C. and lower than or equal to 345° C.   
     
     
         7 . A method for manufacturing the metal clad laminated plate of  claim 1 , the method comprising:
 hot pressing a laminated body by a double belt press method, the laminated body including an insulating film containing the liquid crystal polymer and the metal foil lying on the insulating film.   
     
     
         8 . The method of  claim 7 , wherein
 in the hot pressing of the laminated body, a highest heating temperature is higher than or equal to a temperature lower than a melting point of the insulating film by 5° C. and is lower than or equal to a temperature higher than the melting point by 20° C., and the highest heating temperature is maintained for longer than or equal to 20 seconds and shorter than or equal to 120 seconds.   
     
     
         9 . The metal clad laminated plate of  claim 2 , wherein
 the number of voids which appear between the metal foil and the insulating layer in the cross section is three or less per 10 μm in length in a direction orthogonal to a direction in which the metal foil and the insulating layer face each other.   
     
     
         10 . The metal clad laminated plate of  claim 2 , wherein
 a plate thickness accuracy of the metal clad laminated plate is less than or equal to ±10%.   
     
     
         11 . The metal clad laminated plate of  claim 2 , wherein
 a dimensional stability, defined in IPC-TM650 No. 2.2.4, of the metal clad laminated plate is less than or equal to ±0.1%.   
     
     
         12 . The metal clad laminated plate of  claim 2 , wherein
 the liquid crystal polymer has a melting point of higher than or equal to 300° C. and lower than or equal to 345° C.   
     
     
         13 . The metal clad laminated plate of  claim 3 , wherein
 a plate thickness accuracy of the metal clad laminated plate is less than or equal to ±10%.   
     
     
         14 . The metal clad laminated plate of  claim 3 , wherein
 a dimensional stability, defined in IPC-TM650 No. 2.2.4, of the metal clad laminated plate is less than or equal to ±0.1%.   
     
     
         15 . The metal clad laminated plate of  claim 3 , wherein
 the liquid crystal polymer has a melting point of higher than or equal to 300° C. and lower than or equal to 345° C.   
     
     
         16 . The metal clad laminated plate of  claim 4 , wherein
 a dimensional stability, defined in IPC-TM650 No. 2.2.4, of the metal clad laminated plate is less than or equal to ±0.1%.   
     
     
         17 . The metal clad laminated plate of  claim 4 , wherein
 the liquid crystal polymer has a melting point of higher than or equal to 300° C. and lower than or equal to 345° C.   
     
     
         18 . The metal clad laminated plate of  claim 5 , wherein
 the liquid crystal polymer has a melting point of higher than or equal to 300° C. and lower than or equal to 345° C.