公开(公告)号：US20200207897A1

公开(公告)日：2020-07-02

申请号：US16631415

申请日：2018-07-20

申请人： JSP Corporation

发明人： Kenji HARAGUCHI ,  Jumpei GOTO

IPC分类号： C08F257/02

摘要： The present invention relates to a styrene-based resin having a weight average molecular weight Mw′ as determined by the GPC-MALS method of 1,000,000 or more and 5,000,000 or less, a degree of long-chain branching of 0.2 or more per 1,000 styrene units, and a tetrahydrofuran-insoluble matter of 0.1% by weight or less (including 0), the styrene-based resin being free from a component derived from a polyfunctional monomer in a molecular chain thereof. In a method for producing this styrene-based resin, in an impregnation step of adding a polymerization initiator and a styrene monomer in an aqueous medium, thereby impregnating the polymerization initiator and the styrene monomer in the seed particle at a temperature at which polymerization of the styrene monomer does not substantially proceed, the amount of the styrene monomer is 20 to 200 parts by weight based on 100 parts by weight of the seed particle; and in an additional impregnation polymerization step of graft polymerizing the styrene monomer on the styrene-based resin, the addition amount of the styrene monomer is 50 to 700 parts by weight based on 100 parts by weight of the seed particle, and the content of the styrene monomer in the seed particle is held at 10% by weight or less.

公开(公告)号：US20230075291A1

公开(公告)日：2023-03-09

申请号：US17760410

申请日：2021-02-17

申请人： JSP CORPORATION

发明人： Yohei KANEKO ,  Kenji HARAGUCHI

IPC分类号： C08F220/18 ,  C08F212/08 ,  C08F2/32 ,  C08F218/04 ,  C08J9/22

摘要： A HIPE foam may including a vinyl-based crosslinked polymer as a base material resin. The vinyl-based crosslinked polymer may be formed by crosslinking a polymer of a styrene-based monomer and/or an acryl-based monomer. An apparent density ρ of the HIPE foam may be 35 kg/m3 or more and 500 kg/m3 or less. A molecular weight between crosslinking points of the vinyl-based crosslinked polymer forming the HIPE foam may be 2×103 or more and 2×105 or less. The HIPE foam may be used as, for example, a machinable material or an impact absorbing material.