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AssigneeGeneral Electric Company
InventorsRobert E. Belke, Louis Zakraysek, Walter O. Pillar
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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.
In a multi-layer printed wiring board (MLPWB) made from laminates with bonding sheets therebetween, the improvement which comprises at least one layer thereof formed from a liquid crystalline polymer selected from the group consisting of poly(para-phenylene benzobisthiazole), poly(para-phenylene benzobisoxazole), poly(2,5-benzothiazole), poly(2,5-benzoxazole), and mixtures thereof.
A laminate for use in manufacturing a printed wiring board (PWB) which comprises two outer conductive layers having interposed therebetween a resinous bonding layer bearing a liquid crystal polymer reinforcement selected from the group consisting of poly(para-phenylene benzobisthiazole), poly(para-phenylene benzobisoxazole), poly(2,5-benzothiazole), and poly(2,5-benzoxazole).
In the construction of a multi-layer printed wiring board (MLPWB), a method for controlling the in-plane linear coefficient of thermal expansion (CTE) thereof which comprises forming at least one layer of said MLPWB from a liquid crystal polymer selected from the group consisting of poly(para-phenylene benzobisthiazole), poly(para-phenylene benzobisoxazole), poly(2,5-benzothiazole), poly(2,5-benzoxazole), and mixtures thereof.
Dependencies are inferred from the claim text.