Stock material or miscellaneous articles – Composite – Of polyamide
Reexamination Certificate
1999-02-10
2003-10-14
Mullis, Jeffrey (Department: 1711)
Stock material or miscellaneous articles
Composite
Of polyamide
C428S515000, C524S500000, C524S505000, C525S088000, C525S09200D, C525S095000, C525S096000, C525S097000, C525S098000, C525S191000, C525S240000
Reexamination Certificate
active
06632541
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to olefin-based copolymer compositions. More particularly, the present invention relates to olefin-based copolymer compositions which comprise an olefin-based copolymer, that are excellent in weather resistance, and also excellent in recycling properties due to inclusion of a polyolefin component as the main component thereof.
2. Description of the Related Art
Soft poly(vinyl chloride) materials have an excellent balance between mechanical strength and flexibility and are excellent in cost performance. However, they have a tendency to cause migration of a plasticizer, which causes a generation of specific odors due to the plasticizer, and other problems in use, since a large amount of a plasticizer is usually contained therein. Compositions containing a soft poly(vinyl chloride) as a base material do not have sufficient low temperature properties, and extremely decrease in flexibility at a temperature of equal to or lower than 0° C. Further, recently, the development of alternate materials is intensely desired in view of the generation of a harmful gases that arise in burning of such compositions.
In contrast, polyolefin-based resins are known as materials having excellent recycling properties. However, they can not become suitable alternate materials for soft poly(vinyl chloride) resins since they are hard and are poor in both transparency and elasticity recovering properties, though they can be used partially with other materials in making sheets and films.
For making use of the various characteristics of polyolefin-based resins, various formulations of olefin-based elastomers have been examined, and materials which are soft and excellent in elasticity are commercially available in the general name of polyolefin-based thermoplastic elastomers. However, the polyolefin-based thermoplastic elastomers are lacking in transparency, and can not be used in fields wherein transparency is required.
Thermoplastic elastomers composed of a polyolefin-based resin and a styrene-based thermoplastic elastomer have flexibility and elasticity. However, practically, these elastomers are insufficient in heat resistance and weather resistance, and thus the use thereof is rather restricted.
On the other hand, there are described methods for preparing a thermoplastic elastomer composition excellent that is in heat resistance and mechanical strength by blending a polyolefin-based resin such as a polypropylene, and the like, with a hydrogenated compound of a conjugated diene-styrene copolymer, in Japanese Patent Application Laid-Open (JP-A) Nos. 5-059248, 6-057087, 7-016989, 6-287365, 7-048485, 7-053799, 7-070404, 7-149953, 7-188508, 7-238192, 7-278381, 7-280678, 8-027330, 9-031270 and the like. However, the design of a material essentially composed of an olefin component is expected, in which the content of an aromatic vinyl compound such as styrene is desirably reduced to possibly an even lower extent, in view of recent increases in requirements for recycling of polymer materials and the need to develop materials responding to environmental problems.
SUMMARY OF THE INVENTION
Under such conditions, the present inventors have intensively studied a composition having no problem as described above, and as a result, have found that a composition containing a specific olefin copolymer is excellent in weather resistance, and also excellent in recycling properties since this composition contains a polyolefin component as a main component thereof. In this way, the inventors completed the present invention.
Namely, the present invention relates to an olefin-based copolymer composition comprising the following component (a) in combination with any one component selected from the of the following components (b) to (i):
(a): an olefin-based copolymer obtained by copolymerizing two or more olefins, wherein the olefins are selected from the group consisting of ethylene, propylene and &agr;-olefins having 4 to 20 carbon atoms, and the total number of carbon atoms of the two or more selected olefins is 6 or more;
(b): a crystalline &agr;-olefin-based polymer comprising an &agr;-olefin having 3 or more carbon atoms;
(c): the following component (c-1) and/or component (c-2),
(c-1): a block copolymer comprising (cH) a polymer block containing a vinyl aromatic compound and (cS) a polymer block containing a conjugated diene compound,
(c-2): a hydrogenated product of the block copolymer recited in (c-1);
(d): the component (b) in combination with an isobutylene-isoprene copolymer rubber and/or halogenated isobutylene-isoprene copolymer rubber,
(e): the component (b) in combination with a tackifier resin
(f): the component (b) in combination with a component (f-1) which is an ethylene-propylene (-non-conjugated diene) random copolymer rubber, and a component (f-2) which is an inorganic filler,
(g): a component (g-1) and/or (g-2),
(g-1): a benzotriazole light stabilizer having a benzotriazole skeleton and having a molecular weight of 100 to 5,000,
(g-2): a hindered amine light stabilizer having a piperidyl group in its molecular skeleton and having a molecular weight of about 200 or more,
(h): the component (f-1) in combination with the component (b) and/or an ethylene-based polymer having an ethylene content of about 90 mol % or more; and
(i): the component (b) and the inorganic filler (f-2).
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention will be described below.
The present invention is an olefin-based copolymer composition comprising
(a): an olefin-based copolymer obtained by copolymerizing two or more olefins, wherein the olefins are selected from the group consisting of ethylene, propylene and &agr;-olefins having 4 to 20 carbon atoms and the total number of carbon atoms of the selected olefins is 6 or more, and
(b): a crystalline &agr;-olefin-based polymer comprising an &agr;-olefin having 3 or more carbon atoms.
In the present invention, the component (a) is an olefin-based copolymer obtained by copolymerizing two or more olefins, wherein the olefins are selected from the group consisting of ethylene, propylene and &agr;-olefins having 4 to 20 carbon atoms, and the total number of carbon atoms of the selected olefins is 6 or more.
The &agr;-olefins having 4 to 20 carbon atoms include straight-chain or branched &agr;-olefins, and specifically, examples of the straight-chain &agr;-olefins include 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadenece, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene and the like, and examples of the branched &agr;-olefins include 3-methyl-1-butene, 3-methyl-1-pentene, 4-methyl-1-pentene, 2-ethyl-1-hexene, 2,2,4-trimethyl-1-pentene and the like.
Specific examples of the combination of the selected two or more olefins include ethylene/1-butene, ethylene/1-hexene, ethylene/1-octene, ethylene/1-decene, ethylene/1-octadecene, ethylene/4-methyl-1-pentene, propylene-1/butene, propylene/1-hexene, propylene/1-octene, propylene/1-decene, propylene/1-octadecene, propylene/4-methyl-1-pentene, 1-butene/1-hexene, 1-butene/1-octene, 1-butene/1-decene, 1-butene/1-octadecene, 1-butene/4-methyl-1-pentene, 1-hexene/1-octene, 1-hexene/1-decene, 1-hexene/1-octadecene, 1-hexene/4-methyl-1-pentene, 1-octene/1-decene, 1-octene/1-octadecene, 1-octene/4-methyl-1-pentene, 1-decene/1-octadecene, 1-decene/4-methyl-1-pentene, 1-octadecene/4-methyl-1-pentene, ethylene/propylene/1-butene, ethylene/propylene/1-hexene, ethylene/propylene/1-octene, ethylene/propylene/1-decene, ethylene/propylene/1-octadecene, ethylene/propylene/4-methyl-1-pentene, ethylene/1-butene/1-hexene, ethylene/1-butene/1-octene, ethylene/1-butene/1-decene, ethylene/1-butene/1-octadecene, ethylene/1-butene/4-methyl-1-pentene, ethylene/1-hexene/1-octene, ethylene/1-hexene/1-decene, ethylene/1-hexene/1-octadecene, ethylene/1-hexene/4-methyl-1-pentene, ethylene/1-octene/1-decene, ethylene/1-octene/1-octadecene, ethylene/1-octene/4-methyl-1-p
Hozumi Hidetake
Johoji Hirofumi
Nishiyama Tadaaki
Fitch Even Tabin & Flannery
Mullis Jeffrey
Sumitomo Chemical Company Limited
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