Loading patent…
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsHiroshi Takei, Rikio Yonaiyama, Minoru Yoshimitsu, Nobukazu Atsumi
Estimating the term…
According to the present invention, there is provided a process for stably producing a compositely reinforced polypropylene composition having less warpage deformation and good moldability which includes the steps of using an extruder having at least three feed inlets, feeding an organic peroxide and a polypropylene resin selected from (a) a polypropylene modified by grafting an unsaturated organic acid thereonto, (b) a mixture of the resulting modified polypropylene and an unmodified polypropylene, (c) a mixture of an unsaturated organic acid and an unmodified polypropylene or (d) mixtures of the foregoing to the extruder through the first feed inlet of the extruder, feeding the lamellar inorganic filler thereto through the second feed inlet disposed at a position where the resin mixture is sufficiently melted and kneaded, feeding the glass fiber through the third feed inlet, and then melting and kneading these materials.
A process for producing a compositely reinforced polypropylene resin composition containing at least 10% by weight of a glass fiber and at least 20% by weight of a lamellar inorganic filler and having a melt flow rate of at least 10 g/10 minutes (230.degree. C., 10 minutes and a load of 2.16 kg) comprising the steps of feeding, using an extruder having at least three feed inlets, an amount of organic peroxide sufficient to shorten molecular chains and a polypropylene resin selected from the group consisting of (a) a polypropylene modified by grafting an unsaturated organic acid thereonto, (b) a mixture of said modified polypropylene and an unmodified polypropylene, (c) a mixture of an unsaturated organic acid and an unmodified polypropylene, and (d) mixtures of the foregoing to the extruder through the first feed inlet of the extruder, feeding the lamellar inorganic filler thereto through the second feed inlet disposed at a position where the resin mixture is sufficiently melted and kneaded, feeding the glass fiber thereto through the third feed inlet, and then melting and kneading these materials.
A process for producing a compositely reinforced polypropylene resin composition containing at least 10% by weight of a glass fiber and at least 20% by weight of a lamellar inorganic filler and having a melt flow rate of at least 10 g/10 minutes (230.degree. C., 10 minutes and a load of 2.16 kg) comprising the steps of feeding, using an extruder having at least three feed inlets, an amount of organic peroxide sufficient to improve flowability of the polypropylene resin composition and a polypropylene resin selected from the group consisting of (a) a polypropylene modified by grafting an unsaturated organic acid thereonto, (b) a mixture of said modified polypropylene and an unmodified polypropylene, (c) a mixture of an unsaturated organic acid and an unmodified polypropylene, and (d) a mixture of the foregoing to the extruder through the first feed inlet of the extruder, feeding the lamellar inorganic filler thereto through the second feed inlet disposed at a position where the resin mixture is sufficiently melted and kneaded, feeding the glass fiber through the third feed inlet, and then melting and kneading these materials.
A process for producing a compositely reinforced polypropylene resin composition containing at least 10% by weight of a glass fiber and at least 20% by weight of a lamellar inorganic filler and having a melt flow rate of at least 10 g/10 minutes (230.degree. C., 10 minutes and a load of 2.16 kg) comprising the steps of feeding, using an extruder having at least three feed inlets, at least 0.01% by weight of an organic peroxide and a polypropylene resin selected from the group consisting of (a) a polypropylene modified by grafting an unsaturated organic acid thereonto, (b) a mixture of said resulting modified polypropylene and an unmodified polypropylene, (c) a mixture of an unsaturated organic acid and an unmodified polypropylene, and (d) a mixture of the foregoing to the extruder through the first feed inlet of the extruder, feeding the lamellar inorganic filler thereto through the second feed inlet disposed at a position where the resin mixture is sufficiently melted and kneaded, feeding the glass fiber through the third feed inlet, and then melting and kneading these materials.
Dependencies are inferred from the claim text.