One step preparation and fabrication of partially grafted flexib

Details One step preparation and fabrication of partially grafted flexib One step preparation and fabrication of partially grafted flexib

1990-11-15

1992-05-19

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264540, 26432817, 26432819, 26433115, 26433118, 264349, 425208, B29C 4550, B29C 4560, B29C 4904, B29C 4906

Patent

active

051146584

ABSTRACT:
Melt fabrication, without precompounding, of a composition comprising a thermoplastic resin, an acid containing ethylene copolymer and a polymeric grafting agent, is provided by (1) bringing the molten components of the composition together for the first time, (2) intermittently shearing the components, preferably in an injection molding machine or a blow molding machine having a screw with a shearing section, and (3) intermittently fabricating in one-step the sheared molten composition into articles of pre-determined shape. The thermoplastic resin is less than 50 volume percent and is at least one continuous phase in the composition. The process is improved by increasing back pressure on the screw used in the injection molding machine, to extend the screw rotation and shear time.

REFERENCES:
patent: 4410482 (1983-10-01), Subramanian
patent: 4770837 (1988-09-01), Lu et al.
patent: 4784819 (1988-11-01), Spurr
patent: 4871810 (1989-10-01), Saltman
patent: 4908169 (1990-03-01), Galic et al.
patent: 5013233 (1991-05-01), Semmekrot
C. P. J. M. Verbraak & H. E. H. Meijer, "Screen Design in Injection Molding", vol. 29, No. 7, pp. 479-487.
A. Whelan, Injection Molding Machines, 1984.
Du Pont Information Bulletin, A-88012, 1973.
"Twente Mixing Ring", published by University of Twente, No. 1989.

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