Ethylene oxide/propylene oxide block copolymers as green binders

Details Ethylene oxide/propylene oxide block copolymers as green binders Ethylene oxide/propylene oxide block copolymers as green binders

1992-06-17

1994-06-28

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524413, 524430, 524515, 523139, C08L 3906

Patent

active

053247701

ABSTRACT:
The present invention comprises block copolymers of alkylene oxides, such as ethylene oxide and propylene oxide, which are further formulated with additional polymers such as poly(N-vinylpyrrolidinone), poly (vinyl alcohol), and certain low foam additives. These polymers are useful for the coating of alumina powders for use in ceramics. In aqueous media, their lower viscosities enable facile spray drying of the coated alumina powders. The coated alumina powders may be compressed under relatively low pressure into high density forms with superior unfired compressive strengths (green strength), they are surprisingly insensitive to relative humidity, are readily ejected from the mold, and finally do not have a deleterious effect upon the ultimate high temperature sintering of the formed bodies.

REFERENCES:
patent: 4638029 (1987-01-01), Meschke et al.
patent: 4898902 (1990-02-01), Nagai et al.
Chemical Abstract No. 120023w, 1990, American Chemical Society.

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