Patents by Inventor Norimasa Yamaya

Norimasa Yamaya 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).

  • Patent number: 5525704
    Abstract: Disclosed is an aromatic diamine compound represented by the formula (I) ##STR1## wherein R is H or CH.sub.3. Also disclosed is a bismaleimide compound represented by the formula (IV) ##STR2## wherein R is H or CH.sub.3, A resin forming composition comprising these compounds is also disclosed. The compounds are useful as raw materials for resins, and the resin forming composition and the resin can provide excellent heat resistance and impact resistance and low hygroscopicity.
    Type: Grant
    Filed: October 24, 1995
    Date of Patent: June 11, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Shoji Tamai, Norimasa Yamaya, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 5484948
    Abstract: Disclosed is an aromatic diamine compound represented by the formula (I) ##STR1## wherein R is H or CH.sub.3. Also disclosed is a bismaleimide compound represented by the formula (IV) ##STR2## wherein R is H or CH.sub.3, A resin forming composition comprising these compounds is also disclosed. The compounds are useful as raw materials for resins, and the resin forming composition and the resin can provide excellent heat resistance and impact resistance and low hygroscopicity.
    Type: Grant
    Filed: August 2, 1994
    Date of Patent: January 16, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Keizaburo Yamaguchi, Tatsuhiro Urakami, Yoshimitsu Tanabe, Midori Yamazaki, Shoji Tamai, Norimasa Yamaya, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 5364967
    Abstract: Disclosed is an aromatic diamine compound represented by the formula (I) ##STR1## wherein R is H or CH.sub.3. Also disclosed is a bismaleimide compound represented by the formula (IV) ##STR2## wherein R is H or CH.sub.3, A resin forming composition comprising these compounds is also disclosed. The compounds are useful as raw materials for resins, and the resin forming composition and the resin can provide excellent heat resistance and impact resistance and low hygroscopicity.
    Type: Grant
    Filed: January 19, 1993
    Date of Patent: November 15, 1994
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Keizaburo Yamaguchi, Tatsuhiro Urakami, Yoshimitsu Tanabe, Midori Yamazaki, Shoji Tamai, Norimasa Yamaya, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 5206438
    Abstract: Disclosed is an aromatic diamine compound represented by the formula (I) ##STR1## wherein R is H or CH.sub.3. Also disclosed is a bismaleimide compound represented by the formula (IV) ##STR2## wherein R is H or CH.sub.3, A resin forming composition comprising these compounds is also disclosed. The compounds are useful as raw materials for resins, and the resin forming composition and the resin can provide excellent heat resistance and impact resistance and low hygroscopicity.
    Type: Grant
    Filed: October 23, 1990
    Date of Patent: April 27, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Keizaburo Yamaguchi, Tatsuhiro Urakami, Yoshimitsu Tanabe, Midori Yamazaki, Shoji Tamai, Norimasa Yamaya, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 5145949
    Abstract: Disclosed herein is an aromatic amine resin formed of a mixture of aromatic amine compounds represented by the following general formula (a): ##STR1## wherein A means a phenylene, alkyl-substituted phenylene, diphenylene, diphenyl ether or naphthylenyl group, R.sup.1 denotes a halogen atom or a hydroxyl, C.sub.1-4 alkoxy or C.sub.1-5 alkyl group, l stands for 1 or 2, m is an integer of 0-3, when m is 2 or 3, R.sup.1 s may be the same or different and two of R.sup.1 s may join together into a 5- to 6-membered alicyclic moiety which may optionally contain one or more side chains, and n stands for an integer of 0-300.
    Type: Grant
    Filed: January 22, 1992
    Date of Patent: September 8, 1992
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Keizaburo Yamaguchi, Yoshimitsu Tanabe, Tatsuhiro Urakami, Akihiro Yamaguchi, Norimasa Yamaya, Masahiro Ohta
  • Patent number: 5112899
    Abstract: A thermosetting resin composition formed of a polyaminobismaleimide resin, which is composed of a bismaleimide compound and a diamine compound, and a fibrous reinforcing material. The composition has excellent impact resistance and toughness while retaining conventional high heat resistance.
    Type: Grant
    Filed: September 18, 1990
    Date of Patent: May 12, 1992
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Norimasa Yamaya, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 5106937
    Abstract: Disclosed is a composition for forming a thermosetting resin having excellent impact resistance and toughness. The composition comprises a bismaleimide compound represented by formula (I): ##STR1## wherein R is a hydrogen atom or methyl, and an amine compound represented by formula (II): ##STR2## wherein X is a radical selected from the group of divalent hydrocarbons having from 1 to 10 carbon atoms, hexafluorinated isopropylidene, carbonyl, thio, sulfinyl, sulfonyl, oxo, ##STR3## or by formula (III)): ##STR4## where in n is an integer of 0 to 50. Also disclosed is a process for preparing the composition.
    Type: Grant
    Filed: October 23, 1990
    Date of Patent: April 21, 1992
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Norimasa Yamaya, Shoji Tamai, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 5106953
    Abstract: The invention relates to an aromatic amine resin comprising a mixture of aromatic amine compounds represented by the following general formula (a): ##STR1## wherein A represents a phenylene, alkyl-substituted phenylene, diphenylene, diphenyl ether or naphthylenyl group, R.sup.1 represents a halogen atom or a hydroxyl C.sub.1-4 alkoxy or C.sub.1-5 alkyl group, l is 1 or 2, m is 0, 1, 2 or 3, n is an integer from 0 to 300 and when m is 2 or 3, the R.sup.1 group may be same or different and may join to form a 5- or 6-membered alicyclic moiety which may optionally contain one or more side chains, and also relates to processes for producing the same and a thermosetting composition containing the same.
    Type: Grant
    Filed: April 19, 1990
    Date of Patent: April 21, 1992
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Keizaburo Yamaguchi, Yoshimitsu Tanabe, Tatsuhiro Urakami, Akihiro Yamaguchi, Norimasa Yamaya, Masahiro Ohta
  • Patent number: 5104962
    Abstract: Disclosed is a thermosetting resin composition which comprises a specific bismaleimide compound or polymaleimide and a specific aromatic diamine compound. It can be widely used for electrical and electronic parts, various structural parts, sliding parts and the like.
    Type: Grant
    Filed: October 23, 1990
    Date of Patent: April 14, 1992
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Norimasa Yamaya, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 5084507
    Abstract: A thermosetting resin composition formed of a polyaminobismaleimide resin, which is composed of a bismaleimide compound and a diamine compound, and a powdery inorganic filler. The composition has excellent heat resistance as well as superb mechanical properties at high temperature not to mention room temperature, and is expected to find wide-spread commerical utility in electric and electronic components such as sealing materials, sockets and connectors and other applications.
    Type: Grant
    Filed: February 27, 1990
    Date of Patent: January 28, 1992
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Norimasa Yamaya, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 5051494
    Abstract: The invention relates to an aromatic amine resin comprising a mixture of aromatic amine compounds represented by the following general formula (a): ##STR1## wherein A represents a phenylene, alkyl-substituted phenylene, diphenylene, diphenyl ether or naphthylenyl group, R.sup.1 represents a halogen atom or a hydroxyl C.sub.1-4 alkoxy or C.sub.1-5 alkyl group, l is 1 or 2, m is 0, 1, 2 or 3, n is an integer from 0 to 300 and when m is 2 or 3, the R.sup.1 group may be the same or different and may join to form a 5- or 6-membered alicyclic moiety which may optionally contain one or more side chains, and also relates to processes for producing the same and a thermosetting composition containing the same.
    Type: Grant
    Filed: April 19, 1990
    Date of Patent: September 24, 1991
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Keizaburo Yamaguchi, Yoshimitsu Tanabe, Tatshuiro Urakami, Akihiro Yamaguchi, Norimasa Yamaya, Masahiro Ohta
  • Patent number: 5049606
    Abstract: A thermosetting resin composition formed of a polyaminobismaleimide resin, which is composed of a bismaleimide compound and a diamine compound, and a solid lubricant. The composition has low coefficient of friction and excellent wear resistance, and can be utilized for self-lubricating parts.
    Type: Grant
    Filed: February 27, 1990
    Date of Patent: September 17, 1991
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Norimasa Yamaya, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 5028641
    Abstract: A thermosetting resin composition formed of a polyaminobismaleimide resin, which is composed of a bismaleimide compound and a diamine compound, and a powdery inorganic filler. The composition has excellent heat resistance as well as superb mechanical properties at high temperature not to mention room temperature, and is expected to find wide-spread commercial utility in electric and electronic components such as sealing materials, sockets and connectors and other applications.
    Type: Grant
    Filed: August 2, 1989
    Date of Patent: July 2, 1991
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Norimasa Yamaya, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 4987207
    Abstract: The present invention relates to a thermosetting resin composition comprising about 100 parts by weight of a polyimide and from 5 to about 100 parts by weight of a bismaleimide having a similar structure and processes for preparing the same.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: January 22, 1991
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Norimasa Yamaya, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 4968762
    Abstract: This invention provides thermosetting-resin-forming compositions which are formed of (a) a bismaleimide compound represented by the following formula: ##STR1## wherein R represents a divalent group of ##STR2## X being a direct bond or a group selected from the group consisting of divalent hydrocarbon groups having 1-10 carbon atoms, hexa-fluorinated isopropylidene, carbonyl, thio, sulfinyl, sulfonyl and oxo, and (b) a specific diallylbisphenol compound. These compositions can provide thermosetting resins having high cracking resistance due to improved impact resistance and toughness and low water absorption.
    Type: Grant
    Filed: November 22, 1989
    Date of Patent: November 6, 1990
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Norimasa Yamaya, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 4960852
    Abstract: Thermosetting resin compositions are provided which comprise aromatic bismaleimide derivatives, for example, 2,2-bis[4(3-maleimidephenoxy)phenyl]propane and diamine derivatives, for example, 4,4'-bis(3-aminophenoxy)biphenyl. Prepolymers are also prepared by conducting heat-treatment of said compositions. The compositions of this invention are used for thermoforming such as compression molding etc. as well as raw materials of adhesives and coatings. The compositions provide molded articles which are excellent, for example, impact strength, flexibility and high-temperature stability.
    Type: Grant
    Filed: February 1, 1989
    Date of Patent: October 2, 1990
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Norimasa Yamaya, Nobuhito Koga, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 4959443
    Abstract: The present invention relates to thermosetting resin compositions comprising a bismaleimide compound represented by the formula (I) ##STR1## and an aromatic amine resin represented by the general formula (II) ##STR2## and to processes for preparing the same.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: September 25, 1990
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Norimasa Yamaya, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 4937318
    Abstract: The invention relates to an aromatic amine resin comprising a mixture of aromatic amine compounds represented by the following general formula (a): ##STR1## wherein A represents a phenylene, alkyl-substituted phenylene, diphenylene, diphenyl ether or napthylenyl group, R.sup.1 represents a halogen atom or a hydroxyl C.sub.1-4 alkoxy or C.sub.1 -5 alkyl group, l is 1 or 2, m is 0, 1, 2 or 3, n is an integer from 0 to 300 and when m is 2 or 3, the R.sup.1 group may be same or different and may join to form a 5- to 6-membered alicyclic moiety which may optionally contain one or more side chains, and also relates to processes for producing the same and a thermosetting composition containing the same.
    Type: Grant
    Filed: October 7, 1988
    Date of Patent: June 26, 1990
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Keizaburo Yamaguchi, Yoshimitsu Tanabe, Tatsuhiro Urakami, Akihiro Yamaguchi, Norimasa Yamaya, Masahiro Ohta
  • Patent number: 4847311
    Abstract: This invention is a polyimide resin composition containing 100 parts by weight of polyimide having recurring units of the following general formula (I): ##STR1## where Y is a bond, divalent hydrocarbon radical having from 1 to 10 carbons, hexafluorinated isopropylidene radical, carbonyl radical, thio radical, sulfinyl radical, sulfonyl radical or oxide, and R is a tetra-valent radical of aliphatic radical having 2 or more carbons, cyclic aliphatic radical, monocyclic aromatic radical, fused polycyclic radical and polycyclic aromatic radical wherein the aromatic radicals are linked to one another directly or via bridged member, and from 5 to 100 parts by weight of fibrous reinforcing materials such as glass fibres, carbon fibres, potassium titanate fibres and aromatic polyamide fibres.
    Type: Grant
    Filed: November 30, 1987
    Date of Patent: July 11, 1989
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Norimasa Yamaya, Nobuhito Koga, Kenichi Baba
  • Patent number: 4831102
    Abstract: Thermosetting resin compositions are provided which comprise aromatic bismaleimide derivatives, for example, 2,2-bis[4(3-maleimidephenoxy)phenyl]propane and diamine derivatives, for example, 4,4'-bis(3-aminophenoxy)biphenyl. Prepolymers are also prepared by conducting heat-treatment of said compositions. The compositions of this invention are used for thermoforming such as compression molding etc. as well as raw materials of adhesives and coatings. The compositions provide molded articles which are excellent, for example, in impact strength, flexibility and high-temperature stability.
    Type: Grant
    Filed: July 8, 1987
    Date of Patent: May 16, 1989
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Norimasa Yamaya, Nobuhito Koga, Masahiro Ohta, Akihiro Yamaguchi