Patent classifications
C
CHEMISTRY; METALLURGY
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C08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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C08K
Use of inorganic or non-macromolecular organic substances as compounding ingredients
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C08K5/04
Oxygen-containing compounds
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C08K5/15
Heterocyclic compounds having oxygen in the ring
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C08K5/151
having one oxygen atom in the ring
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C08K5/1525
Four-membered rings
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