Poly(propylene carbonate)-containing ceramic tape formulations a

Details Poly(propylene carbonate)-containing ceramic tape formulations a Poly(propylene carbonate)-containing ceramic tape formulations a

1989-12-07

1992-02-18

Derrington, James

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

264 63, 264166, 264344, C04B 3564

Patent

active

050890700

ABSTRACT:
Ceramic green tape formulations are described comprising critical amounts of a ceramic powder, poly(propylene carbonate) as the binder, a solvent mixture and a plasticizer. These ingredients are admixed to yield a slurry having a Brookfield viscosity in the range of about 500 to 4500 cps at 25.degree. C. The slurry is cast into a thin film on a substrate, the solvent mixture is removed from the film and the green tape is removed from the substrate. The poly(propylene carbon)-based green tapes have been shown to have tensile strengths of greater than 35 psi and flexibility which would permit successful punching of register and feed-through (via) holes and screen printing. The green tapes of this method are easily laminated to produce multilayered capacitors and other multilayered structures having ceramic contents well in the range generally considered desirable for ceramic processing. The binder burn-off characteristics of the green tapes of this invention are superior to prior art precursor formulations under all comparable conditions.

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