Tailorable multi-layer printed wiring boards of controlled coeff

Details Tailorable multi-layer printed wiring boards of controlled coeff Tailorable multi-layer printed wiring boards of controlled coeff

1987-04-21

1989-10-24

Gron, Teddy S.

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

With charge transferring layer of specified composition

174 685, 174106R, 1741261, 1741262, 361380, 361397, 361117, 428196, 428206, 428209, 428240, 428246, 428252, 428288, 428295, 428292, 428457, 428458, 4284735, 428901, C09K 1900, B32B 1504, H01B 500, H05K 100

Patent

active

048761206

ABSTRACT:
Disclosed are improved laminates useful in the manufacture of multi-layer printed wiring boards (MLPWB) and laminates. Such improved composites contain at least one layer which is formed from a liquid crystal polymer selected from the group consisting of poly(para-phenylene benzobisthiazole), poly(paraphenylene benzobisoxazole), poly(2,5-benzothiazole), poly(2,5-benzoxazole), and mixtures thereof. The presently preferred liquid crystal polymer comprises poly(para-phenylene benzobisthiazole). The negative coefficient of thermal expansion and high modulus of elasticity of the liquid crystal polymers enable a laminate and MLPWB to be manufactured therefrom having a tailored coefficient of thermal expansion, broadly ranging from about 0 to 15 ppm/.degree. C. MLPWBs constructed of polymeric core layers also are possible utilizing the preferred liquid crystal polymers of the present invention.

REFERENCES:
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patent: 4533693 (1985-08-01), Wolfe et al.
patent: 4533724 (1985-08-01), Wolfe et al.
patent: 4554119 (1985-11-01), Chenevey
patent: 4606875 (1986-08-01), Chenevey et al.
patent: 4675246 (1987-06-01), Kundinger et al.
patent: 4680244 (1987-07-01), Lehmann et al.
Macromolecules, 1981, 14, 909 et. seq., American chemical Society.
Polymer Preprints, 28, No. 1, 50 (Apr., 1987).

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