Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1994-03-18
1997-01-07
Smith, Edward J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
5263482, 5263485, 5263484, 526160, 428332, C08F 1006
Patent
active
055918174
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.
REFERENCES:
patent: 3258455 (1966-06-01), Natta et al.
patent: 3361728 (1968-01-01), Coen et al.
patent: 4892851 (1990-01-01), Ewen et al.
J. Am. Chem. Soc. 1988, 110, pp. 6255-6256.
World Patent Index Latest, Section Ch. Week 40, Derwent Publications Ltd., London, GB; Class A, AN 83-779353 & JP-A-58 142 818 (Idemitsu Petrochem) Aug. 25, 1983.
World Patent Index Latest, Section Ch. Week 40, Derwent Publications Ltd., London, GB; Class A, AN 86-261852 & JP-A-61 189 920 (Idemitsu Petrochem) Aug. 23, 1986.
Puff et al, Crystalline Olefin Polymer, Pt. II, Interscience Publ. N.Y. vol. XX, (1964) p. 209.
Asanuma Tadashi
Ito Mitsuru
Sasaki Tateyo
Shiomura Tetusnosuke
Mitsui Toatsu Chemicals Inc.
Smith Edward J.
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