Patents by Inventor Asako Ito

Asako Ito has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Photoinitiators having chain transfer groups polymerized to obtain macrophotoinitiators useful to give block copolymers
    Patent number: 6458864
    Abstract: Compounds with chain transfer groups of the formula I, II, III and IV wherein a is 1 or 2; Ar and Ar1 inter alia are phenyl; Ar2 inter alia is phenylene, these groups being unsubstituted or substituted; X is a direct bond, —O—, —S— or —N(R6)—; Y inter alia is hydrogen or C1-C12alkyl; M1 is —NR3R4 or —OH, or M1 is Ar when R1 and R2 are alkoxy, or aryloxy; R1 and R2 independently of one another e.g. are C1-C8alkyl; R3 and R4 for example are C1-C12alkyl, or together are C3-C7alkylene; R5 inter alia is C1-C6alkylene or a direct bond; R6 is for example hydrogen; and Z is a divalent radical, provided that at least one of the radicals Ar, Ar1, Ar2, R1, R2, R3, R4, R5 or Y is substituted by SH groups; are suitable for the thermal preparation of macrophotoinitiators which are polymerized photochemically to give block-copolymers.
    Type: Grant
    Filed: November 27, 2000
    Date of Patent: October 1, 2002
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Toshikage Asakura, Masaki Ohwa, Hitoshi Yamato, Asako Ito