DETAILED DESCRIPTION OF THE INVENTION Lecithins can be hydroxylated according to the procedure described by Julian et al.
in U.
S.
Pat.
No.
2,629,662 which is incorporated herein by reference.
Any lecithin which contains a hydroxylatable substituent, e.
g.
an unsaturated fatty acid, can be employed in the present invention once it has been hydroxylated.
Also, it is common practice to employ carriers for the lecithin and when the hydroxylation procedure is conducted with a mixture of the lecithin and the carrier and if the carrier is also hydroxylatable, e.
g.
an unsaturated fatty acid, then the carrier is likewise hydroxylated.
In the practice of this invention, it is preferred to employ as the internal mold release agent, that which contains a hydroxylated lecithin and a hydroxylated carrier.
A particularly suitable carrier is soybean oil.
Suitable lecithins which can be hydroxylated for use in the present invention can be found in the aforesaid Julian et al.
U.
S.
Pat.
No.
2,629,662 and also in U.
S.
Pat.
No.
4,024,088, both of which are incorporated herein by reference.
Suitable commercially available hydroxylated lecithins include ALCOLEC Z-3 available from American Lecithin Co.
, Inc.
and M-C-THIN HL available from Lucas Meyer (America), Inc.
The mold release agents are suitably employed in quantities of at least about 0.
1, preferably from about 1 to about 20, most preferably from about 3 to about 5, parts per 100 parts by weight of total active hydrogen containing material employed.
In those instances where it is desirable, the hydroxylated lecithin material and the active hydrogen containing material can be employed as a concentrate wherein it is later (a) diluted with or (b) employed with one or more of the active hydrogen-containing components but as separate streams when forming a polyurethane-forming mixture in which instance the quantity of the hydroxylated lecithin material can be employed at concentrations up to the miscibility limit of the mixture.
By miscibility limit it is meant that the components can be readily mixed so as to form a relatively uniform mixture of the components even though the components of the mixture may be mutually insoluble such that any relatively uniform mixture formed therefrom is not stable over prolonged periods
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Nonmetallic Processes 
