Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-12-16
2000-03-14
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
528272, 528302, 528308, 525437, 525445, C08F 800
Patent
active
060374136
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase under 35 U.S.C. .sctn.371 of prior PCT International Application No. PCT/JP97/01313 which has an International filing date of Apr. 16, 1998 which designated the United States of America, the entire contents of which are hereby incorporated by reference.
TECHNICAL FIELD
This invention relates to a polyester which has excellent compatibility with a resinous or rubbery polymer and is useful for improving coatability and adhesion of a resinous or rubbery polymer by incorporating the polyester therein; a process for producing the polyester; a composition comprising the polyester and the resinous or rubbery polymer; and a shaped article made of the composition.
BACKGROUND ART
Olefin resins such as polypropylene and olefin rubbers such as an ethylene-propylene copolymer rubber have excellent physical properties and are relatively inexpensive, and therefore, are widely used. However, olefin resins and rubbers do not have a polar group in the molecule, and a coating film and an adhered layer, formed thereon, have a poor adhesive force to the resins and rubbers, and thus a practically acceptable bond strength is difficult to obtain.
To solve the above-mentioned problems of olefin resins, proposals have been made of incorporating in the olefin resins modifiers such as a polycarbonate diol (Japanese Publication of Unexamined Patent Application [abbreviated to "JP-A"] No. H6-172596) and a diol-terminated polyether-ester prepared by a ring-opening polymerization of a lactone such as .sup.a -caprolactone, with ethylene glycol (JP-A H6-116472) whereby the surfaces of olefin resin articles are modified. The modifiers used have a problem such that they do not have a sufficient compatibility with the olefin resins and the coating properties are not improved to a satisfying extent.
To solve the problems of olefin rubbers, proposals have been made of incorporating in the olefin rubbers modifiers such as a polyhydroxypolybutadiene such that at least 98% of the double bonds have been hydrogenated (Japanese Publication of Examined Patent Application [abbreviated to "JP-B"] No. S57-6462), a hydroxyl-terminated hydrocarbon polymer such as a polyhydroxypolyolefin (JP-A H1-197534), and a low-molecular-weight polyisoprene such that at least 50% of the double bonds have been hydrogenated (JP-A H2-69545). However, the modifier-incorporated olefin rubbers still exhibit a poor adhesive force to a coating.
Recently the present inventors have found that a polyester with a hydroxyl value of at least 30 mgKOH/g, prepared by a polycondensation of a polycarboxylic acid predominantly comprised of a dimer acid of polymerized fatty acid with a polyhydric alcohol, exhibits an excellent compatibility with resinous polymers such as an olefin resin, and a greatly enhanced coatability, and filed a patent application (Japanese Patent Application No. H7-51955). However, the polyester derived from a polycarboxylic acid predominantly comprised of a dimer acid of polymerized fatty acid is generally liquid and has a poor handling property. It is thus desired to provide a modifier for modifying resinous or rubbery polymers, which has a high softening point and is capable of being handled in a solid form, and has excellent compatibility with the resinous or rubbery polymers and coatability.
DISCLOSURE OF INVENTION
An object of the present invention is to provide a novel polyester which is capable of improving the coatability and adhesion of a resinous or rubbery polymer by incorporating the polyester in the resinous or rubbery polymer, and which has a high softening point and a good handling property; and further to provide a process for producing the polyester.
Another object of the invention is to provide a shaped article made of a resinous or rubbery polymer and having improved coatability and adhesion; and a resin or rubber composition used for the preparation of the shaped article.
In one aspect of the present invention, there is provided a modifier for a resinous or rubbery polymer, which comprises as an ef
REFERENCES:
patent: 5620801 (1997-04-01), Binns et al.
patent: 5780399 (1998-07-01), Ishikawa et al.
Ikeda Shinya
Kitahara Shizuo
Acquah Samuel A.
Nippon Zeon Co Ltd.
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