초록 ▼

A mixed aliphatic/aromatic polycarbodiimide prepared by first polymerizing an aliphatic isocyanate or mixture thereof, optionally in the presence of a polyfunctional isocyanate; arresting polymer chain growth by reaction with a stoichiometrically deficient amount of a monofunctional isocyanate-react

A mixed aliphatic/aromatic polycarbodiimide prepared by first polymerizing an aliphatic isocyanate or mixture thereof, optionally in the presence of a polyfunctional isocyanate; arresting polymer chain growth by reaction with a stoichiometrically deficient amount of a monofunctional isocyanate-reactive compound, followed by further polymerization with an aromatic diisocyanate.

대표청구항 ▼

A method for preparing a mixed aliphatic/aromatic polycarbodiimide comprising: (a) polymerizing a saturated aliphatic diisocyanate or a saturated cycloaliphatic diisocyanate or a mixture thereof, optionally containing a polyfunctional isocyanate, in the presence of a polycarbodiimide polymerization

A method for preparing a mixed aliphatic/aromatic polycarbodiimide comprising: (a) polymerizing a saturated aliphatic diisocyanate or a saturated cycloaliphatic diisocyanate or a mixture thereof, optionally containing a polyfunctional isocyanate, in the presence of a polycarbodiimide polymerization catalyst to form a polycarbodiimide intermediate having free isocyanate groups; (b) reacting said polycarbodiimide intermediate with a monofunctional isocyanate-reactive compound or a mixture thereof in an amount insufficient to react with all of said free isocyanate groups, and (c) further polymerizing said polycarbodiimide intermediate in the presence of an aromatic diisocyanate and said catalyst under polycarbodiimide-forming conditions until essentially all of the isocyanate groups are depleted.