Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1989-11-06
1992-05-12
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525428, G08F 890
Patent
active
051129167
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a novel olefin polymer useful as a modifier for thermoplastic resins or as a compatibility agent for thermoplastic resin compositions, and also relates to a resin composition containing this novel olefin polymer. More particularly, the present invention relates to an olefin polymer having a number average molecular weight of 500 to 50,000 and having an acid anhydride group only at a terminal thereof, a resin composition comprising this olefin polymer and a polyamide, and a polyamide-polyolefin resin composition containing the olefin polymer as a compatibility agent.
BACKGROUND ART
It is well-known to obtain a resin composition, which is generally called a polymer alloy, by incorporating into a thermoplastic resin another resin having different characteristics, as a modifier for the thermoplastic resin. However, when resins inherently incompatible with each other are alloyed, problems, such as phase separation, are likely to occur owing to poor dispersion, frequently rendering it difficult to achieve the objective of the modification. Accordingly, attempts have been made to add various compatibility agents in order to achieve the objective.
For example, with respect to alloying a polyamide and a polyolefin which are incompatible with each other, it is known to use, as compatibility agents, a compound obtained by grafting an unsaturated carboxylic acid or a derivative thereof onto a polyolefin in the presence of a radical initiator; a compound obtained by copolymerizing an olefin monomer with a carboxylic acid or a derivative thereof and then neutralizing the resultant copolymer with a metal salt; a compound obtained by copolymerizing a polyamide with a polyolefin; and the like.
However, conventionally known compatibility agents have not been satisfactory.
For example, U.S. Pat. No. 4,174,358 discloses the use of an elastomer having sites (e.g., carboxylic acid or its derivative) which adhere to a polyamide. However, the elastomer must have a specific value of modulus and is not effective when it is used in a small amount. Further, a polyamide resin composition obtained in accordance with U.S. Pat. No. 4,174,358 has disadvantages in that it undergoes gelation and discoloration into a brown color during the processing thereof.
On the other hand, Japanese Patent Application Laid-Open Specification Nos. 60-1255 and 62-265349 disclose the use of a copolymer or a block copolymer of a polyamide and an olefin polymer. These copolymer and block copolymer are not only commercially disadvantageous in that they are difficult to produce, but also unsatisfactory in effect.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a novel olefin polymer which is useful not only as a modifier for a polyamide but also as a compatibility agent capable of exhibiting improved efficiency of dispersion in alloying a polyamide and a polyolefin.
It is another object of the present invention to provide a polyamide resin composition comprising a polyamide and the above-mentioned novel olefin polymer having an acid anhydride group only at a terminal thereof, which is extremely improved in toughness, particularly in tensile elongation.
It is still another object of the present invention to provide a polyamide/olefin-containing polymer resin composition containing the above-mentioned novel olefin polymer having an acid anhydride group only at a terminal thereof, which is improved in efficiency of dispersion by virtue of the olefin polymer contained therein so that it is excellent in toughness (tensile elongation, impact resistance, etc.), long life coolant resistance (LLC resistance), low water absorption properties, weld-line toughness, and the like.
The term "efficiency of dispersion" as used in the present invention means how uniformly and efficiently a resin is microdispersed in another resin in alloying different types of resins. In alloying resins, the uniform microdispersion provides not only an improved surface appearance, which is represented by foli
REFERENCES:
patent: 3288714 (1966-11-01), Osuch
patent: 3770849 (1973-11-01), Matzner et al.
patent: 4174358 (1979-11-01), Epstein
patent: 4473686 (1984-09-01), Grigo et al.
Hinoue Kenichi
Nakahashi Jun-ichi
Natori Itaru
Ochiai Nobutaka
Asahi Kasei Kogyo Kabushiki Kaisha
Lipman Bernard
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