US 2025/0034443 A1 · HYDROXY/AMINO OXIME-BASED HOT MELT ADHESIVES FOR REWORK, REPAIR, AND RECYCLE

Abstract

The present disclosure provides polymers prepared by a method comprising reacting a polymerization mixture comprising one or more types of hydroxy/amino-oximes, one or more types of diols, one or more types of polyols (e.g., triols), one or more types of isocyanates, and optionally one or more types of oximes. At least one instance of =N—OH of at least one instance of the hydroxy/amino-oximes may react with —NCO of the isocyanates to form ═N—O—C(═O)—NH— bonds. The polymers may be a thermoset under ambient conditions. At elevated temperatures, the polymers may undergo a transition from a cross-linked state to a lightly cross-linked or un-crosslinked state (e.g., at least in part because at least one instance of the =N—O—C(═O)—NH— bonds may be cleaved (e.g., to form ═N—OH and —NCO)). The transition may be reversable (e.g., by changing the temperature). The polymers of the present disclosure may be useful as hot melt adhesives. The present disclosure also provides compositions, kits, methods of preparation, methods of bonding, and methods of de-bonding.

Claims34

Dependent claims

A polymer prepared by a method comprising reacting a polymerization mixture comprising one or more types of hydroxy/amino-oximes, one or more types of diols, one or more types of polyols, one or more types of isocyanates, and optionally one or more types of oximes at a first temperature for a first time duration sufficient to forming the polymer, wherein:

each type of the hydroxy/amino-oximes is independently a compound comprising one or more instances of =N—OH, zero or more instances of C—OH, zero or more instances of —NH2, zero or more instances of —NH—, and zero instances of —NCO, wherein the combined number of C—OH, —NH2, and —NH— of each type of the hydroxy/amino-oximes is at least one;
each type of the oximes is independently a compound comprising two or more instances of =N—OH and zero instances of each of C—OH, —NH2, —NH—, and —NCO;
each type of the diols is independently a compound comprising zero or more instances of C—OH, zero or more instances of —NH2, zero or more instances of —NH—, and zero instances of each of =N—OH and —NCO, wherein the combined number of C—OH, —NH2, and —NH— of each of the diols is two;
each type of the polyols is independently a compound comprising zero or more instances of C—OH, zero or more instances of —NH2, zero or more instances of —NH—, and zero instances of each of =N—OH and —NCO, wherein the combined number of C—OH, —NH2, and —NH— of each of the polyols is at least three;
and
each type of the isocyanates is independently a compound comprising two or more instances of —NCO and zero instances of each of —OH, —NH2, and —NH—.

3 more elements

Dependencies are inferred from the claim text.

Hydroxy/amino oxime-based hot melt adhesives for rework, repair, and recycle

Life of this patent

Hydroxy/amino oxime-based hot melt adhesives for rework, repair, and recycle

Life of this patent

Abstract

Claims34