Pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet
US12371598B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2022 |
| Grant date | Jul 29, 2025 |
| Priority date | — |
| Expiry date | Aug 6, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09J2453/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A PSA composition comprising a block copolymer of a monovinyl-substituted aromatic compound and a conjugated diene compound, a tackifier resin, and a softening agent is provided. The tackifier resin comprises a natural product-based tackifier resin (A) having a softening point higher than 80° C. and containing no aromatic ring, and a petroleum-based tackifier resin (B) having a softening point higher than 100° C. and containing an aromatic ring. The content of the tackifier resin (A) is 40 to 120 parts by weight, the content of the tackifier resin (B) is 5 to 40 parts by weight, the total amount of the tackifier resin is 60 to 160 parts by weight, and the content of the softening agent is 5 to 40 parts by weight with respect to 100 parts by weight of the block copolymer, with respect to 100 parts by weight of the block copolymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.