Process for increasing molecular weight of vinylpyrrolidone poly

Details Process for increasing molecular weight of vinylpyrrolidone poly Process for increasing molecular weight of vinylpyrrolidone poly

1975-05-27

1980-02-26

Wong, Jr., Harry

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

252 855R, 260 296R, 424 80, 424358, 428402, 521131, 526264, C08F 2610

Patent

active

041907183

ABSTRACT:
The process for increasing the molecular weight of poly-N-vinylpyrrolidone over that normally obtained by suspension polymerization of N-vinylpyrrolidone in a saturated hydrocarbon suspension medium, by adding to the suspension medium a controlled amount of water, specifically an amount between about 1% and 35% by weight based on the total weight of N-vinylpyrrolidone monomer. The significantly higher molecular weight of the resulting polymeric product can be still further increased by additionally incorporating in the suspension medium between about 0.001 mol % and about 1 mol % of a difunctional vinyl cross-linking agent per mol of N-vinylpyrrolidone monomer. The polymeric products of the present invention are preferably water soluble granules having a porous structure; although the present invention also concerns the poly-N-vinylpyrrolidone having a number average molecular weight of between 400,000 and 2,000,000, preferably between 450,000 and 1,500,000 in any physical form.

REFERENCES:
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patent: 3563968 (1971-02-01), Merijan et al.
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patent: 3689439 (1972-09-01), Field et al.
patent: 3803104 (1974-04-01), Barabas et al.
patent: 3862915 (1975-01-01), Fried et al.
Schildknecht, Vinyl and Related Polymers, published by John Wiley & Sons, Inc., New York (1952), p. 31.

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