Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1990-10-05
1993-08-03
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525243, 525245, 525191, C08L 2300
Patent
active
052329925
ABSTRACT:
According to the present invention, molded articles can be provided in which a melting point attributed to a syndiotactic polypropylene and measured at a temperature rise rate of 10.degree. C./minute by differential scanning thermal analysis is indicated by a substantially single peak, the aforesaid molded articles being obtained by heating, melting and molding a substantially syndiotactic homopolymer of propylene, a substantially syndiotactic copolymer of propylene and a small amount of another olefin, or a mixture of these polymers and a small amount of a substantially isotactic polypropylene, and then subjecting the molded products to a heat treatment. Furthermore, a method for preparing the above-mentioned molded articles is also provided. The molded articles have high stiffness and impact resistance.
REFERENCES:
patent: 3367926 (1968-02-01), Voeks
patent: 4500681 (1985-02-01), Shulman
World Patent Index Latest; Week 8814; AN 83-779353[40] & JP-A-58 142 818 (Idemitsu Pertrochem) Aug. 25, 1983 (Abstract).
World Patent Index Latest; Week 9101; AN 86-261852[40] & JP-A-61 189 920 (Idemitsu Pertrochem, KK) Aug. 23, 1986 (Abstract).
Asanuma Tadashi
Inoue Takeo
Sasaki Tateyo
Shiomura Tetsunosuke
Uchikawa Nobutaka
Kight III John
Mitsui Toatsu Chemicals Incorporated
Truong Duc
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