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    MOLDED ARTICLES OF SYNDIOTACTIC POLYPROPYLENE AND METHOD FOR PREPARING SAME
    15.
    发明专利
    MOLDED ARTICLES OF SYNDIOTACTIC POLYPROPYLENE AND METHOD FOR PREPARING SAME 未知

    公开(公告)号：CA2030245C

    公开(公告)日：1994-07-12

    申请号：CA2030245

    申请日：1990-11-19

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ASANUMA TADASHI ,  SASAKI TATEYO ,  ITO MITSURU ,  SHIOMURA TETSUNOSUKE

    IPC: C08J5/00 ,  B29C35/00 ,  B29C67/24 ,  B29C71/02 ,  B29K23/00 ,  B29K105/32 ,  C08F4/642 ,  C08F110/06

    Abstract: A molded article of a syndiotactic polypropylene having excellent transparency in which a melting point attributed to the polypropylene having the syndiotactic structure measured at a heating rate of 10.degree.C/minute by differential scanning thermal analysis is represented by a substantially single peak, the aforesaid molded article being prepared by heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olefin, which have a substantially syndiotactic structure, or a mixture of the homopolymer or the copolymer and a small amount of a polypropylene having a substantially isotactic structure, followed by quenching, or, after these steps, additionally subjecting the above molded article to a heat treatment at a temperature of less than its melting point. A method for preparing the above molded article is also disclosed here.

    STRETCHED FILMS OF POLYPROPYLENE
    16.
    发明专利
    STRETCHED FILMS OF POLYPROPYLENE 未知

    公开(公告)号：CA2017246C

    公开(公告)日：1994-01-11

    申请号：CA2017246

    申请日：1990-05-22

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ASANUMA TADASHI ,  YAMAMOTO KAZUHIKO ,  SASAKI TATEYO ,  INOUE TAKEO ,  YAMADA TAKAYUKI

    IPC: B29C55/02 ,  B29C55/00 ,  B29C59/02 ,  B29K23/00 ,  B29L7/00 ,  C08J5/18

    Abstract: A stretched film of polypropylene which is excellent in transparency, substantially free of an antiblocking agent and at least uniaxially stretched and which is characterized in that it has uniformly distributed projections having a height of from 0.05 to 0.50 .mu. and a diameter of from 10 to 100 .mu. at least on the surface thereof as well as a method for preparing the foregoing stretched film of polypropylene which comprises the steps of forming, into a sheet, polypropylene which comprises a nucleating agent in an amount selected so that the crystallization temperature of polypropylene is increased by 1 to 10.degree.C by the addition thereof and then stretching the sheet at a temperature ranging from 140 to 165 .degree.C are herein disclosed.

    18.
    发明专利
    未知

    公开(公告)号：DE3688323D1

    公开(公告)日：1993-05-27

    申请号：DE3688323

    申请日：1986-12-09

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ASANUMA TADASHI ,  UCHIKAWA NOBUTAKA ,  FUJIO ICHIRO

    IPC: B01J19/00 ,  C08F4/60 ,  C08F4/64 ,  C08F10/00 ,  C08F10/06 ,  C08F110/06 ,  C08F2/00

    Abstract: Polypropylene of uniform quality is produced at a desired, constant production rate on a continuous basis in the presence of a catalyst system composed of a transition metal catalyst and an organoaluminum compound. The polypropylene production rate is calculated based on the quantity of heat removed per unit time from a reaction tank (1) operated at a constant temperature, and is controlled by varying the amount of the organoaluminum compound to be charged, when the weight ratio of the organoaluminum compound to the transition metal catalyst both retained in the reaction tank is not greater than a preset value. The production rate of polypropylene may also be controlled by varying the amount of the transition metal catalyst to be charged, when the weight ratio of the organoaluminum compound to the transition metal catalyst both retained in the reaction tank is greater than a preset value.

    POLY-.ALPHA.-OLEFINS
    20.
    发明专利
    POLY-.ALPHA.-OLEFINS 未知

    公开(公告)号：CA2018145C

    公开(公告)日：1993-01-12

    申请号：CA2018145

    申请日：1990-06-04

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： ASANUMA TADASHI ,  SHIOMURA TETSUNOSUKE ,  NISHIMORI YUKARI ,  UCHIKAWA NOBUTAKA

    IPC: C08F10/08 ,  C08F10/14 ,  C08F110/08 ,  C08F110/14

    Abstract: : A poly-.alpha.-olefin of novel structure which is an addition polymer of an .alpha.-olefin having 4 carbon atoms or more, wherein (a) by the analysis of the peaks attributable to the side chain methylene groups directly bonded to the main chain in the 13C-NMR spectrum produced by the measurement in 1,2,4-trichloro-benzene, (i) a novel main peak not attributable to the isotactic structure thereof is positioned on the side of higher magnetic field than is the peak attributable to the isotactic structure, and (ii) the intensity of said main peak is 0.3 or more relative to the sum of the intensities of the total peaks attributable to the side chain methylene groups directly bonded to the main chain, and (b) the molecular weight measured by gel permeation chromatography and calculated as polypropylene is not less than 1,000.

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