US 11,028,216 B2 · Polycarbodiimide copolymer

Abstract

To provide a polycarbodiimide copolymer and a modified polycarbodiimide copolymer each suitable for a curing agent that can allow a cured product of a carboxy group-containing resin composition to be improved in flexibility without any loss of water resistance, as well as a curing agent of a carboxy group-containing resin composition, and a carboxy group-containing resin composition. The present invention enables a cured product to be enhanced in water resistance due to introduction of a predetermined soft segment into a polycarbodiimide molecule, in use for a curing agent, and also enables a carboxy group-containing resin composition to be enhanced in storage stability due to modification with an aliphatic amine or an aromatic heterocyclic amine.

Claims14

Dependent claims

A polycarbodiimide copolymer comprising:

a soft segment comprising a residue in which hydroxyl groups are removed from at least one polyol selected from the group consisting of castor oil, a castor oil-based polyol having 2 to 10 functional groups, and a long-chain aliphatic diol represented by HO-R1-OH wherein R1 represents a linear or branched, saturated or unsaturated alkylene group containing 30 to 150 carbon atoms, and
a hard segment composed of polycarbodiimide derived from an aromatic diisocyanate compound, the hard segment bonding to the soft segment through a urethane bond, and
wherein an end isocyanate remaining as an end of the hard segment is capped with an end-capping agent, and the polyol is castor oil or a castor oil-based polyol having 2 to 10 functional groups.

Dependencies are inferred from the claim text.

Polycarbodiimide copolymer

Life of this patent

Polycarbodiimide copolymer

Life of this patent

Abstract

Claims14