Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-09-10
2000-09-19
Gorr, Rachel
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5263472, 526348, 526351, 526352, C08L 5300
Patent
active
061213772
ABSTRACT:
This invention relates to thermoplastic elastomeric polyolefin alloys (preferably polypropylene alloys) and the processes for preparing naturally compatibilized polyolefin alloys using a "one-pot" polymerization of a single monomer (preferably propylene), whereby two homopolymers having different stereoisomeric structures are produced (preferably stereoregular and stereoirregular), as well as a third block copolymer having alternating sequences of the two structural segments of the two homopolymers; and wherein catalyst compositions are used enabling the direct synthesis of naturally compatibilized polymer blends comprising for components: two organometallic complexes of group IVB elements, a catalyst which irreversibly reacts with at least one ligand on the transition metal complexes converting it to catalytically active state, and a hydrocarbyl, substituted hydrocarbyl, or oxyhydrocarbyl compound of Group IIA, IIB, and IIIA metals, which functions as a cross-over agent.
REFERENCES:
patent: 4335225 (1982-06-01), Collette et al.
patent: 5444134 (1995-08-01), Matsumoto
R. Waymouth; Advances in Stereoblock Olefin Polymerization; Presentation to US Paten Office, Nov., 1995.
Academy of Applied Science
Gorr Rachel
Rines and Rines
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