Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1993-08-30
1995-05-02
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524855, 526119, C08L 902, C08L 904
Patent
active
054120012
ABSTRACT:
The present invention relates to a method to reactor-fill polyolefins and to reactor-filled composites obtained from the instant method. More specifically, the present invention relates to a method to reactor-fill polyolefins comprising the steps of (a) adding a catalytic amount of a low activity catalyst to a filler material either during or before polymerization to initiate the formation of atactic polyolefin on the surface and in the pores of the filler; (b) contacting the product of step (a) in no specific order with a high activity catalyst, a cocatalyst, and, if necessary a cocatalyst modifier; and (c) adding an alpha-olefin under olefin polymerization reaction conditions to the reaction product of step (b) to form a reactor-filled composite. The addition of the low activity catalyst to the filler material causes compatibilization of the filler with the matrix polymer, reduced fines, rounded aggregate particles and increased catalyst activity over an un-filled polymerization catalyst system or by that afforded by the elimination of the low activity catalyst obtained from the method of the present invention. The reactor-filled polyolefin composites produced by the instant invention are characterized as having a relatively uniform distribution of filler particles dispensed therein and having improved physical and rheological properties compared to prior art reactor-filled composites.
REFERENCES:
patent: 3678025 (1972-07-01), Birrell
patent: 3950303 (1976-04-01), Lipscomb
patent: 4004071 (1977-01-01), Aishima et al.
patent: 4104243 (1978-08-01), Howard, Jr.
patent: 4263422 (1981-04-01), Lowery, Jr. et al.
patent: 4374753 (1983-02-01), Pullukat et al.
patent: 4473672 (1984-09-01), Bottrill
patent: 4530913 (1985-07-01), Pullukat et al.
patent: 4564647 (1986-01-01), Hayashi et al.
patent: 4786697 (1988-11-01), Cozewith et al.
patent: 4950631 (1990-08-01), Buehler et al.
patent: 5098969 (1992-03-01), Buehler et al.
patent: 5221650 (1993-06-01), Buehler et al.
patent: 5237025 (1993-08-01), Beham et al.
patent: 5275991 (1994-01-01), Buehler
"Polymerization of Ethene by Ziegler Catalysts in the Presence of Fillers", Schoppel et al., Makromol. Chem., Rapid Commun, vol. 3, pp. 483-488 (1982).
Guarriello John J.
Heidrich William A.
Michl Paul R.
Quantum Chemical Corporation
LandOfFree
Method to reactor-fill polyolefins by formation of a dual cataly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method to reactor-fill polyolefins by formation of a dual cataly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method to reactor-fill polyolefins by formation of a dual cataly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1137538