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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C08G
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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18/00
Polymeric products of isocyanates or isothiocyanates
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C08G18/06
with compounds having active hydrogen
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C08G18/28
characterised by the compounds used containing active hydrogen
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C08G18/30
Low-molecular-weight compounds
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C08G18/38
having heteroatoms other than oxygen
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C08G18/3842
containing heterocyclic rings having at least one nitrogen atom in the ring
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C08G18/3844
containing one nitrogen atom in the ring
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