formaldehyde - Sciencemadness Dot Org

316
FORMALDEHYDE
ically involved in the resins produced. In some cases the resin-like characteristics
of these materials are modified or enhanced by reaction with
formaldehyde so that they also serve per se as modified resins*
The water-soluble polyvinyl alcohol, which is itself a synthetic resin,
reacts with formaldehyde to give a thermoplastic formal insoluble in water
but soluble in many organic solvents. The preparation of this formaldehyde-modified
resin has been already discussed (p. 141). Polyvinyl formal
is employed in the production of safety-glass interlayers and in coated
fabrics.
Carbohydrates may also be converted to resins by processes involving
formaldehyde. For example, mono- and disaccharides are reported to be
converted to clear, glass-like resins by reaction with formaldehyde or paraformaldehyde
in the presence of hexamethylenetetramine followed by condensation
with acidic materials such as succinic, tartaric, or malic acid",
and phthalic anhydride 13 .
Starch is modified with formaldehyde to give pastes or powders which
ean be solidified to produce water-resistant products. Such materials
may be employed as sizing agents, coating compounds, and adhesives.
Procedures involve heating with formaldehyde under various conditions
alone and in the presence of acid catalysts- 0 -- 4 . Production of a rubber-like
product from starch is also claimed by one investigator (page 143).
References
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