Patent ID: 11952514
Assignee: PPG INDUSTRIES OHIO, INC.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC B  C

Claim 23:
24. An adhesive composition, comprising:
50 to 90% by weight, based on total composition weight, of an epoxy-containing component;
5 to 40% by weight, based on total composition weight, of a blocked polyisocyanate curing agent; and
0.1 to 10% by weight, based on total composition weight, of a latent curing catalyst;
wherein the blocked polyisocyanate curing agent is represented by the following structure:, , wherein:
Y represents the residue of a polyisocyanate;
m≥1, p≥0, and m+p≥2;
X is N(R2), O, or S;
when X═N(R2), R is hydrogen, a C1 to C10 alkyl group, an aryl group, a polyether, a polyester, a polyurethane, a hydroxy-alkyl group, or a thio-alkyl group;
when X═O or S, R is a C1 to C10 alkyl group, an aryl group, a polyether, a polyester, a polyurethane, a hydroxy-alkyl group, or a thio-alkyl group;
each R1 is independently hydrogen, a C1 to C10 alkyl group, an aryl group, or a cycloaliphatic group;
when m≥2, R is optionally a multi-valent C1 to C10 alkyl group, a multi-valent aryl group, a multi-valent polyether, a multi-valent polyester, or a multi-valent polyurethane;
each R2 is independently hydrogen, a C1 to C10 alkyl group, an aryl group, a cycloaliphatic group, a hydroxy-alkyl group, or a thio-alkyl group;
R and R2 together can form a cycloaliphatic, heterocyclic structure; and
O—Z represents the residue of a second blocking agent.