Laminate of fiber-reinforced, crosslinked polypropylene
First Claim
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 φ
- r at 20°
C. and 106 Hz of smaller than 3, dissipation factor tan δ
at 20°
C. and 106 Hz, measured after storing for 96 hours under a climate of 40°
C. and 92% relative atmospheric humidity (DIN
53483) of <
0.02, and a solder bath stability >
20 seconds, measured at 260°
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 R1 is hydrogen or an alkyl radical of 1-4 carbon atoms;
R2 is a straight-chain alkylene radical of 1-10 carbon atoms;
R2 is a straight-chain alkylene radical of 1-10 carbon atoms;
R3 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.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
20 Citations
15 Claims
-
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 φ
- r at 20°
C. and 106 Hz of smaller than 3, dissipation factor tan δ
at 20°
C. and 106 Hz, measured after storing for 96 hours under a climate of 40°
C. and 92% relative atmospheric humidity (DIN
53483) of <
0.02, and a solder bath stability >
20 seconds, measured at 260°
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 R1 is hydrogen or an alkyl radical of 1-4 carbon atoms;R2 is a straight-chain alkylene radical of 1-10 carbon atoms; R2 is a straight-chain alkylene radical of 1-10 carbon atoms; R3 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- r at 20°
-
12. A process for the production of laminates for printed circuits which comprises forming at least two flat support layers with a bilateral covering of a film of polypropylene material comprising at least one of a homopolymer and a copolymer propylene containing crosslinking agent;
- and press molding the at least two layers in a heated press under a pressure of 5-200 bar into a flat structure having a thickness of 0.1-2.0 mm;
said crosslinking agent comprising 1.0-5% by weight, based on the amount of propylene material of an alkoxy-silane compound of the formula;
##STR4## wherein R1 is hydrogen or an alkyl radical of 1-4 ccarbon atoms;
R2 is a straight-chain alkylene radical of 1-10 carbon atoms;
R3 is an alkoxy radical of 1-5 atoms which can optionally be interrupted by an oxygen atom; and
m and n are equal to 0 or 1. - View Dependent Claims (13, 14, 15)
- and press molding the at least two layers in a heated press under a pressure of 5-200 bar into a flat structure having a thickness of 0.1-2.0 mm;
Specification