Process for the preparation of low molecular weight polyhydroxyl

Details Process for the preparation of low molecular weight polyhydroxyl Process for the preparation of low molecular weight polyhydroxyl

1977-08-30

1981-01-27

Cockeram, H. S.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

252 71, 2604106, 521172, 521173, 560 26, 560115, 560158, 568678, 568861, 568863, 424 82, 568388, 568463, C08G 1814, C08G 1854, C07C 4719

Patent

active

042476534

ABSTRACT:
A process is disclosed for preparing mixtures of low molecular weight polyhydroxyl compounds and hydroxyaldehydes and hydroxyketones by condensing formaldehyde hydrate with itself in the presence of (I) as catalyst a soluble or insoluble compound of a metal of the first to eighth sub-group or second to fourth main group of the Periodic System of Elements, optionally bound to a high molecular weight carrier, and (II) more than 10% by weight, based on formaldehyde, of one or more dihydric or higher hydric low molecular weight alcohols and/or higher molecular weight polyhydroxyl compounds. The pH of the reaction mixture is held at 5.5 to 9.0 until 5-40% conversion has occurred and is then lowered to between 4.5 and 8.0 (0.5-2.0 pH units lower). The reaction is then stopped by inactivating the catalyst.

REFERENCES:
patent: 2224910 (1940-12-01), Hanford et al.
patent: 2269935 (1942-01-01), Hanford et al.
patent: 2334761 (1943-11-01), Hanford et al.
patent: 2351302 (1944-06-01), Staudinger et al.
patent: 2760983 (1956-08-01), MacLean et al.
patent: 2775621 (1956-12-01), MacLean et al.
patent: 2818443 (1957-12-01), Robeson
patent: 3021289 (1962-02-01), Mueller et al.
patent: 3876706 (1975-04-01), Levanersky et al.

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