公开(公告)号：US10189949B2

公开(公告)日：2019-01-29

申请号：US14903506

申请日：2014-07-07

Applicant: SOMAR CORPORATION

Inventor： Yoshiyasu Takiue

IPC: C08L77/00 ,  C08G73/10 ,  C09D179/08

Abstract: Provided are: a transparent polyimide copolymer which satisfies solvent solubility, storage stability, heat resistance, mechanical strength and thermal yellowing resistance at high levels and has excellent utility; a polyimide resin composition; a molded article; and a production method of the copolymer. The transparent polyimide copolymer is obtained by copolymerizing: (A) 4,4′-oxydiphthalic dianhydride and/or 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride; and (B) at least one diamine and/or diisocyanate represented by the following Formulae (1) to (3): (wherein, X represents an amino group or an isocyanate group; R1 to R8 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms; and at least one of the R1 to R8 is not a hydrogen atom).

公开(公告)号：US10308766B2

公开(公告)日：2019-06-04

申请号：US14897511

申请日：2014-04-17

Applicant: SOMAR CORPORATION

Inventor： Yoshiyasu Takiue

IPC: C08G73/10 ,  C09D179/08 ,  C09J179/08

Abstract: Provided is a solvent-soluble polyimide copolymer which satisfies storage stability and heat resistance at high levels and has excellent utility. The polyimide copolymer is obtained by copolymerizing (A) 3,3′,4,4′-biphenyltetracarboxylic dianhydride with (B) diamine(s) and/or diisocyanate(s) and has no glass transition temperature observed at lower than 500° C. The component (B) is preferably at least one diamine and/or diisocyanate represented by the following Formulae (1) to (3): (wherein, X represents an amino group or an isocyanate group; R1 to R8 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms; and at least one of the R1 to R8 is not a hydrogen atom).

公开(公告)号：US10246555B2

公开(公告)日：2019-04-02

申请号：US14897495

申请日：2014-04-17

Applicant: SOMAR CORPORATION

Inventor： Yoshiyasu Takiue

IPC: C08G73/10 ,  C08G73/16 ,  C08G75/02 ,  C08G75/23 ,  C09D179/08 ,  C09J179/08 ,  C08G75/20

Abstract: Provided are: an oligomer of polyimide copolymer which is an intermediate of a polyimide copolymer having excellent utility and satisfying solvent solubility, storage stability and heat resistance at high levels; a polyimide copolymer obtained therefrom; and their production methods. The oligomer of polyimide copolymer and the polyimide copolymer are obtained by copolymerizing (A) 3,3′,4,4′-biphenyltetracarboxylic dianhydride and/or 3,3′,4,4′-diphenylsulfonetetracarboxylic dianhydride with (B) at least one diamine and/or diisocyanate represented by the following Formulae (1) to (3): (wherein, X represents an amino group or an isocyanate group; R1 to R8 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms; and at least one of the R1 to R8 is not a hydrogen atom).

公开(公告)号：US10053541B2

公开(公告)日：2018-08-21

申请号：US14903506

申请日：2014-07-07

Applicant: SOMAR CORPORATION

Inventor： Yoshiyasu Takiue

IPC: C08L77/00 ,  C08G73/10 ,  C09D179/08

Abstract: Provided are: a transparent polyimide copolymer which satisfies solvent solubility, storage stability, heat resistance, mechanical strength and thermal yellowing resistance at high levels and has excellent utility; a polyimide resin composition; a molded article; and a production method of the copolymer. The transparent polyimide copolymer is obtained by copolymerizing: (A) 4,4′-oxydiphthalic dianhydride and/or 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride; and (B) at least one diamine and/or diisocyanate represented by the following Formulae (1) to (3): (wherein, X represents an amino group or an isocyanate group; R1 to R8 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms; and at least one of the R1 to R8 is not a hydrogen atom).

公开(公告)号：US09975998B2

公开(公告)日：2018-05-22

申请号：US14785273

申请日：2014-04-17

Applicant: SOMAR CORPORATION

Inventor： Yoshiyasu Takiue

IPC: C08G73/10 ,  C09D179/08

CPC classification number: C08G73/1085 ,  C08G73/1042 ,  C08G73/105 ,  C08G73/1064 ,  C08G73/1067 ,  C08G73/1071 ,  C09D179/08

Abstract: The present invention provides: a polyimide copolymer which satisfies solvent solubility, storage stability and heat resistance at high levels and has excellent utility; and a method of producing the same. The polyimide copolymer is obtained by copolymerizing an oligomer of polyimide copolymer, which is obtained by copolymerizing (A) a pyromellitic dianhydride and (B) at least one diamine and/or diisocyanate represented by the following Formula (1) or (2): (wherein, X represents an amino group or an isocyanate group; R1 to R4 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms; and at least one of the R1 to R4 is not a hydrogen atom), with (C) second acid dianhydride different from the (A).