Primer composition

Patent metadata

Field	Value
Publication number	US-12540247-B2
Application number	US-202017776026-A
Country	US
Kind code	B2
Filing date	Oct 29, 2020
Priority date	Nov 27, 2019
Publication date	Feb 3, 2026
Grant date	Feb 3, 2026

Abstract

The present invention relates to a primer composition that achieves excellent adhesion to poorly adhesive materials. Specifically, the present invention relates to a primer composition that includes (A) benzophenone, (B) a compound that has at least 2 benzene rings and a molecular weight of at least 190, and (C) a solvent.

First claim

What is claimed is:

1 . A primer composition comprising:
a component (A): benzophenone; a component (B): the component (B) is selected from the group consisting of 4-methacryloyloxybenzophenone, 2,2,4,4-tetramethylbenzophenone, 3,3,4,4-benzophenonetetracarboxylic dihydride, 4,4-dimethylbenzophenone, 4-dimethylaminobenzophenone, xanthone, and 2,4-dihydroxybenzophenone; and a component (C): a solvent,
wherein a content of the component (B) is 1 to 12 parts by mass relative to 100 parts by mass of the component (A), and wherein the component (C) is acetone or n-hexane.

2 . The primer composition according to claim 1 , wherein
the component (B) is 4-methacryloyloxybenzophenone.

3 . The primer composition according to claim 1 , wherein
a content of the component (B) is 2 to 10 parts by mass relative to 100 parts by mass of the component (A).

4 . The primer composition according to claim 1 , that is used for bonding a hard-to-bond material.

5 . A method for bonding an adherend, comprising the steps of:
(1): applying the primer composition according to claim 1 onto a surface of an adherend; (2): drying the applied primer composition; (3): modifying the surface of the adherend onto which the primer composition is applied by irradiating the dried primer composition with an active energy ray; (4): applying a curable resin composition onto the modified surface of the adherend; and (5): forming a cured product of the curable resin composition on the surface of the adherend by curing the applied curable resin composition.

6 . The bonding method according to claim 5 , wherein
the curable resin composition comprises a compound having any of a (meth)acryloyl group, an epoxy group, and a hydrolyzable silyl group.

7 . The bonding method according to claim 5 , wherein
the adherend is of polypropylene or polyethylene.

8 . A method for modifying a surface of an adherend, comprising the steps of;
(1): applying the primer composition according to claim 1 onto a surface of an adherend; (2): drying the applied primer composition; and (3): modifying the surface of the adherend onto which the primer composition is applied by irradiating the dried primer composition with an active energy ray.

9 . The primer composition according to claim 1 , wherein the primer composition consists of the component (A), the component (B) and the component (C).

10 . The primer composition according to claim 2 , wherein
a content of the component (B) is 2 to 10 parts by mass relative to 100 parts by mass of the component (A).

11 . The primer composition according to claim 2 , wherein the total content of the component (A) and the component (B) is 1 to 20 parts by mass relative to 100 parts by mass of the component (C).

12 . The primer composition according to claim 1 , wherein a shear adhesive strength is maintained at at least 4 MPa after 60 minutes at 25° C. following primer application.

13 . The primer composition according to claim 4 , wherein the hard-to-bond material is selected from polyethylene, polypropylene, polyacetal, polyethylene terephthalate, syndiotactic polystyrene, or polyphenylene sulfide.

Assignees

• Three Bond Co Ltd

Inventors

• Omura Ai

Classifications

• C09D5/002 Primary

  Priming paints (C09D5/08 takes precedence) · CPC title

• C09J201/00

  Adhesives based on unspecified macromolecular compounds · CPC title

• C09J5/02 Primary

  involving pretreatment of the surfaces to be joined · CPC title

• C09D201/00

  Coating compositions based on unspecified macromolecular compounds · CPC title

• C09D7/63

  organic · CPC title