公开(公告)号：US20230052577A1

公开(公告)日：2023-02-16

申请号：US17880092

申请日：2022-08-03

Applicant: NITTO DENKO CORPORATION

Inventor： Muneshige NAKAGAWA ,  Hiroaki TAKAHASHI ,  Fumika KAWATAKE ,  Nobukazu NEGISHI ,  Itsuhiro HATANAKA

IPC: C09J153/02 ,  C09J7/38 ,  C09J11/08 ,  C08L93/04

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.

公开(公告)号：US20230096432A1

公开(公告)日：2023-03-30

申请号：US17800628

申请日：2021-02-17

Applicant: NITTO DENKO CORPORATION

Inventor： Nobukazu NEGISHI ,  Itsuhiro HATANAKA ,  Hiroaki TAKAHASHI

IPC: C09J7/38 ,  C09J7/35 ,  C09J11/06 ,  C09J133/10

Abstract: Provided is a hot-melt pressure-sensitive adhesive composition which enables to form a pressure-sensitive adhesive layer without allowing the progression of rapid gelation at the time of heating and melting. The pressure-sensitive adhesive composition provided by the present invention is a solvent-free hot-melt pressure-sensitive adhesive composition. The pressure-sensitive adhesive composition includes a base polymer, an isocyanate crosslinking agent, and a tackifier A represented by the following general formula (1): R—[(CH3)2C6H2—(CH2O)n—CH2]m—OH (1) (in the general formula (1), R is a hydrogen atom or a hydroxyl group, m is 9 to 16, and n is 0 to 3). A content of the tackifier A with respect to 100 parts by weight of the base polymer is 1 part by weight to 10 parts by weight.