Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-01-25
1998-03-17
Zemel, Irina S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525265, C08F25500, C08F 846
Patent
active
057287767
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a process for producing a graft modified polyolefin having good adhesion to polar materials such as nylon, polyester, glass, metal, etc.
2. Related Art
In general, since the polyolefins have excellent mechanical properties, moldability, hygiene, etc., they have been used in wide fields. On the other hand, owing to the non-polar property, polyolefin unfavorably has poor adhesion to the polar material. In order to improve the adhesion of the polyolefin to the polar material, various proposals have been made. One of those proposals is that a radical-polymerizable monomer having polymerizable an unsaturated bond is introduced into the polyolefin by grafting the monomer with the polyolefin. As the radical-polymerizable monomer, monomers such as unsaturated carboxylic acids or their derivatives are known.
As the graft reaction process, there are a process in which the grafting reaction is effected in a solution state (for example, see Japanese patent publication No. 44-15,422), a process in which the grafting reaction is effected in a slurry state (for example, see Japanese patent publication No. 43-18,144) and a process in which the grafting reaction is effected in a molten state (for example, see Japanese patent publication No. 43-27,421).
Among these processes, according to the process (the molten state grafting process) in which an extruder is used and each of materials is melted in a melting zone of the extruder and the melts are reacted with each other in the molten state, it is easy to handle a necessary producing equipment, so that the molten state grafting process has been widely industrially used. After the grafting reaction is effected in the molten state, the grafting reaction product is subjected to a reduced pressure by means of a ventilation unit provided for the extruder so as to remove the non-reacted monomer.
However, in general, the molten state grafting reaction process unfavorably has a poor grafting efficiency.
Furthermore, the non-reacted radical-polymerizable monomer and non-grafted byproducts produced by a sub-reaction other than the grafting reaction remain in the graft modified polyolefin produced by the molten state grafting reaction. If the residual content of these byproducts increases in the grafting reaction product, the adhesion of the grafted polyolefin to the polar material is deteriorated. In addition, when a variety of members, sheets, or films are formed by molding the graft modified polyolefin, these residual byproducts may form bubbles. Therefore, it is necessary to reduce the content of these residual products.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to effectively graft-polymerizing a radical-polymerizable monomer in a polyolefin-molten state in a process for the production of the graft modified polyolefin by melting and kneading the polyolefin, a radical-polymerizable monomer, and a radical-polymerization initiator.
It is another object of the present invention to largely reduce the residual content of the non-reacted monomer, the non-grafted byproduct, etc. in the process for the production of the graft modified polyolefin by melting and kneading the polyolefin, the radical-polymerizable monomer and the radical-polymerization initiator.
According to a first aspect of the present invention which is directed to a process for the production of the graft modified polyolefin by melting the polyolefin, the radical-polymerizable monomer and the radical-polymerization initiator, there is a provision of a process for the production of the graft modified polyolefin characterized in that the radical-polymerizable monomer is an unsaturated carboxylic anhydride, and this unsaturated carboxilic anhydride as a raw material is preliminarily heated at 50.degree. to 250.degree. C., and subjected to the grafting reaction.
Having made a trial experiment with respect to the above molten state grafting process particularly by using the unsaturated carboxylic anhydride as the mono
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Ogawa Taichi
Sashi Kazumichi
Takano Shigeru
Takemura Kazuya
Wakui Tadahiro
Kawasaki Steel Corporation
Zemel Irina S.
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