Process for the preparation of polyvinyl alcohols which are solu

Details Process for the preparation of polyvinyl alcohols which are solu Process for the preparation of polyvinyl alcohols which are solu

1989-11-27

1991-03-05

Schofer, Joseph L.

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...

524425, 524447, 524493, 524557, C08K 330

Patent

active

049978705

ABSTRACT:
A process is provided for the preparation of polyvinyl alcohols absorbed onto pigments. In the process 10% to 30% strength by weight of aqueous solutions of partially hydrolyzed polyvinyl alcohols or fully or partially hydrolyzed vinyl alcohol copolymers, which are soluble in cold water, are spray-dried after the addition of 20% to 40% by weight, relative to the total solids content of the resulting suspension, of organic or inorganic pigments, preferably chalk. The invention is also directed to the pulverulent product and its use, wherein the product is distinguished by good flow capacity and an extremely low methanol content. It is suitable for use as a binder in paper coating compositions and in coatings for the surface finishing of paper and cardboard.

REFERENCES:
patent: 3222306 (1965-12-01), Suzumura et al.
patent: 3287313 (1966-11-01), Imoto
patent: 3652313 (1972-03-01), Nagata et al.
patent: 3738957 (1973-06-01), Iler
patent: 3773776 (1973-11-01), Iler
patent: 3829402 (1974-08-01), Zimmermann
patent: 3915919 (1975-10-01), Nishioka et al.
patent: 4094694 (1978-06-01), Long
patent: 4617060 (1986-10-01), Dreibelbis

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