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Laminate of fiber-reinforced, crosslinked polypropylene
| Details |
Inventors: Klaar, Karlo; Spielau, Paul; Kuhnel, Werner;
Assignee: Dynamit Nobel Aktiengesellschaft (Troisdorf, DE)
Primary Examiner: Cannon; James C.
Assistant Examiner:
Attorney, Agent or Firm: Antonelli, Terry & Wands
A laminate is made of textile sheet structures of synthetic fibers or glass fibers with a covering of polypropylene. The polypropylene is crosslinked by addition of crosslinking agents. The laminate has good electrical insulating properties, perfect solder bath stability, and good mechanical machinability. This laminate is provided, in heated presses, with metal layers or can be provided, in heated presses, with metal layers or can be provided with such metals layers by the application of metallic foils or by electrolytical methods, and serves for the manufacture of printed circuits and ribbon cables. An advantageous production of the textile sheet structures encased with crosslinked polypropylene can be performed on roll stands by thermoplastic encasing and smoothing in a continuous process. |
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DETAILED DESCRIPTION What is claimed is: 1.
A laminate of substrate material for printed circuits which comprises at least one fiber-reinforced support layer, said support layer having a flat structure that is formed of synthetic organic fibers and/or of glass fibers and that is penetrated by a polypropylene material containing crosslinking agent, said laminated exhibiting relative permittivity .
phi.
r at 20.
degree.
C.
and 10.
sup.
6 Hz of smaller than 3, dissipation factor tan .
delta.
at 20.
degree.
C.
and 10.
sup.
6 Hz, measured after storing for 96 hours under a climate of 40.
degree.
C.
and 92% relative atmospheric humidity (DIN 53483) of <0.
02, and a solder bath stability >20 seconds, measured at 260.
degree.
C.
(DIN IEC 52); said crosslinking agent comprising 1.
0-5% by weight, based on the amount of polypropylene material, of an alkoxy-silane compound of the formula: ##STR2## wherein R.
sub.
1 is hydrogen or an alkyl radical of 1-4 carbon atoms; R.
sub.
2 is a straight-chain alkylene radical of 1-10 carbon atoms; R.
sub.
2 is a straight-chain alkylene radical of 1-10 carbon atoms; R.
sub.
3 is an alkoxy radical of 1-5 carbon atoms which can optionally be interrupted by an oxygen atom; and m and n are equal to 0 or 1.
2.
A laminate according to claim 1, wherein the flat structure contains fibers in the form of a nonwoven mat, a woven fabric, or a mat formed of glass fibers, mineral fibers or synthetic fibers, having melting points of above 120.
degree.
C.
3.
A laminate according to claim 1, wherein said at least one support layer contains, depending on the desired flexibility or rigidity, 5-60% by weight of the reinforcing fibers, based on the total weight of the laminate.
4.
A laminate according to claim 2, wherein said at least one support layer contains, depending on the desired flexibility or rigidity, 5-60% by weight of the reinforcing fibers, based on the total weight of the laminate.
5.
A laminate according to claim 1, wherein, for penetration of the reinforcing fibers, said polypropylene material comprises an essentially isotactic homopolymer of propylene with a density of about 0
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