1
Syriac J Palackal, Helmut G Alt, Konstantinos Patsidis, Tara G Hill, Gil R Hawley, Peter P Chu, M Bruce Welch, Rolf L Geerts: Olefin polymerization using silyl-bridged metallocenes. Phillips Petroleum Company, Edward L Bowman, March 28, 1995: US05401817 (70 worldwide citation)

Fluorenyl-containing silyl bridged metallocenes, the process of using such metallocenes to polymerize olefins, and the resulting unusual syndiotactic polypropylene are disclosed.


2
Weiqing Weng, Armen H Dekmezian, Eric J Markel, David L Peters: Elastomeric propylene polymers. Exxon Chemical Patents, Brent M Peebles, David J Alexander, Charles E Runyan, February 6, 2001: US06184327 (59 worldwide citation)

A thermoplastic elastomer is provided comprising a branched olefin polymer having crystalline sidechains and an amorphous backbone wherein at least 90 mole percent of the sidechains are isotactic or syndiotactic polypropylene and at least 80 mole percent of the backbone is atactic polypropylene. Add ...


3
Lajos E Keller, Marie France Nothnagle: Uniaxially shrinkable biaxially oriented polypropylene film and its method of preparation. Mobil Oil Corporation, Dennis P Santini, Lori F Cuomo, November 25, 1997: US05691043 (53 worldwide citation)

A uniaxially heat-shrinkable, biaxially oriented, multilayer film having a polypropylene-containing core layer comprising at least 70 wt % of said multilayer film and at least one polyolefin-containing skin layer adjacent said core layer is prepared by biaxially orienting a coextrudate and thereafte ...


4
Lothar Bothe, Volker Dolle, Andreas Winter, Thomas Wilhelm: Heat-sealable packaging film. Hoechst Aktiengesellschaft, Foley & Lardner, October 19, 1993: US05254394 (45 worldwide citation)

A polyolefin film which comprises a polypropylene base layer and at least one top layer of a propylene polymer, wherein the base layer is formed of an isotactic polypropylene and the top layer of a syndiotactic polypropylene, has high sealed-seam strength and excellent optical properties and is usef ...


5
Andrew F Wilkie: Biaxially oriented polypropylene cold seal release films. AEP, Mathews Collins Shepherd & Gould P A, August 11, 1998: US05792549 (42 worldwide citation)

A coextruded biaxially oriented polyolefin packaging film has a cold seal release layer, a core layer, and a cold seal receptive skin layer. The cold seal release layer is fabricated of about 1% to about 80% by weight polyolefin polymer selected from isotactic homopolymer polypropylene, syndiotactic ...


6
John A Ewen, Abbas Razavi: Syndiotactic polypropylene. Fina Technology, Jim D Wheelington, M Norwood Cheairs, December 19, 1995: US05476914 (42 worldwide citation)

The invention provides for highly crystalline syndiotactic polypropylene comprising a high percentage of racemic (r) dyads. The high crystallinity may be due to the polymerization mechanism of metallocene catalysts of a particular structure which appear to produce syndiotactic polypropylene of a new ...


7
Tadashi Asanuma: Method for increasing intrinsic viscosity of syndiotactic polypropylene. Mitsui Toatsu Chemicals, Burns Doane Swecker & Mathis, April 6, 1993: US05200439 (41 worldwide citation)

A method for increasing the intrinsic viscosity of polypropylene having a substantially syndiotactic structure is disclosed which comprises the step of irradiating the syndiotactic polypropylene with radiation in the absence of oxygen. After the irradiation, the polypropylene is preferably heated. F ...


8
Abbas Razavi, John A Ewen: Syndiotactic polypropylene. Fina Technology, Jim D Wheelington, February 6, 2001: US06184326 (39 worldwide citation)

The invention provides for highly crystalline syndiotactic polypropylene comprising a high percentage of racemic (r) dyads. The high crystallinity may be due to the polymerization mechanism of metallocene catalysts of a particular structure which appear to produce syndiotactic polypropylene of a new ...


9
Patrick Brant, Kenneth O McElrath Jr, Martha H Robertson: Syndiotactic hot melt adhesive. Exxon Chemical Patents, Catherine L Bell, Myron B Kurtzman, May 31, 1994: US05317070 (37 worldwide citation)

A hot melt adhesive including syndiotactic polypropylene having a polymer chain of at least 80% racemic dyads and having a melting point of about 100.degree. C. to 180.degree. C.


10
Michael Musgrave, Mohan R Gownder, Jay Nguyen: Bicomponent fibers of syndiotactic polypropylene. Fina Technology, Madan Mossman & Sriram P C, August 8, 2006: US07087301 (33 worldwide citation)

Bicomponent fibers of syndiotactic polypropylene and ethylene-propylene random copolymer, can be prepared. The bicomponent fibers may exhibit self-crimp properties and high shrinkage characteristics.