Abstract: Disclosed are oriented poly(alkylene carbonates) useful in packaging film for food and other oxygen effected substances. These oriented polymers include poly(alkylene carbonates) with substantial crystallinity. Also disclosed is the crystallization of amorphous poly(alkylene carbonates) by stretching or orienting them. Further disclosed are (1) a high oxygen barrier, high clarity laminate resistant to delamination, that has a layer comprising an oriented, low oxygen barrier, predominantly crystalline polymer, and another layer adherent directly or indirectly thereto and comprising an oriented poly(alkylene carbonate) preferably with substantial crystallinity; and (2) a method for making the laminate from the polymer and the amorphous counterpart of the poly(alkylene carbonate).

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.