Plasticizer containing polyvinyl alcohol granules

Details Plasticizer containing polyvinyl alcohol granules Plasticizer containing polyvinyl alcohol granules

1980-12-01

1982-04-06

Bleutge, John C.

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...

525 57, 524387, 524503, 524557, C08K 318, C08K 505, C08L 2904

Patent

active

043234925

ABSTRACT:
For the thermoplastic processing of polyvinyl alcohol, the processing temperature must be below the decomposition temperature of the polyvinyl alcohol; this is attained by incorporating plasticizers. For preparing a plasticizer-containing granular polyvinyl alcohol wherein the plasticizer is homogeneously distributed, there is used as starting material a granular polyvinyl alcohol consisting substantially of particles having a definite diameter. The plasticizer is incorporated in the presence of a small amount of water insufficient to dissolve the polyvinyl alcohol, and the temperature is adjusted in a definite manner during the mixing operation. Simultaneous presence of fine particles of a high molecular weight organic compound soluble or dispersible in water is advantageous. The plasticizer-containing granular polyvinyl alcohol is suitable for the manufacture of any shaped articles, especially films and sheets.

REFERENCES:
patent: 2127896 (1938-08-01), Vohrer
patent: 2138751 (1938-11-01), Vohrer
patent: 2177612 (1939-10-01), Schnabel
patent: 2277259 (1942-03-01), Schnabel
patent: 2311059 (1943-02-01), Lowe
patent: 2351301 (1944-06-01), Sonnichsen
patent: 2399401 (1946-04-01), Sonnichsen et al.
patent: 2468345 (1949-04-01), Porter
patent: 2491642 (1949-12-01), Brant
patent: 2576820 (1951-11-01), Barnes et al.
patent: 2737458 (1956-03-01), Burnham
patent: 3121701 (1964-02-01), Ingleby

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