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US 11,952,514 B2Granted
Low-temperature curing adhesive compositions
AssigneePPG Industries Ohio, Inc.
InventorsHongying Zhou, Masayuki Nakajima, Kar Tean Tan
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Abstract
Disclosed herein is an adhesive composition comprising: an epoxy-containing component; and a blocked polyisocyanate curing agent comprising a blocking group derived from a blocking agent comprising an alpha-hydroxy amide, ester, or thioester, or a combination thereof. Also disclosed are methods for forming a bonded substrate with the adhesive composition. Also disclosed is an article comprising first and second substrates and the adhesive composition.
Claims24
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 comprising at least one blocking group derived from an alpha-hydroxy amide blocking agent, an alpha-hydroxy ester blocking agent, or an alpha-hydroxy thioester blocking agent;
- and
- 0.1 to 10% by weight, based on total composition weight, of a latent curing catalyst.
1 more element
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.
14 more elements
Dependencies are inferred from the claim text.