(under subclass 411.1) Product in which at least one layer contains linearly recurring diester linkages of carbonic acid and a polyhydric alcohol.
(1) Note. The linearly recurring ester linkages of carbonic acid require that at least a single carbonyl oiety (C=O) be linked to two different oxygen atoms, each of which is further linked to carbon atoms. The term "diester" used here, does not include the reaction product of two carbamic acid molecules with a glycol (i.e., the term does not include polyurethane*). The reaction product of carbamic acid and a glycol is considered a poly (amido ester*) and a patent claiming a laminate comprising such a product will be placed in subclass 190 below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
423+, for a laminate comprising a layer including poly (amido ester*) e.g., esters of carbamic acid; and see (1) Note above.
