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Hot-melt adhesive
| Details |
Inventors: Kawasaki, Masaaki; Minami, Shuji; Kitani, Hiroaki; Yoshitake, Junichi;
Assignee: Mitsui Petrochemical Industries, Ltd. (Tokyo, JP)
Primary Examiner: Teskin; Fred
Assistant Examiner:
Attorney, Agent or Firm: Sherman and Shalloway
A random copolymer of an .alpha.-olefin having 4 to 12 carbon atoms with an aromatic vinyl monomer containing 50 to 98% by mol of .alpha.-olefin and having a softening point of 40.degree. to 150.degree. C. is useful as a hot-melt adhesive and is excellent in adhesiveness, workability, environmental aging resistances such as thermal aging resistance. The copolymer is combined with 70 to 10% by weight of a tackifier for the whole so that it can be used as a hot-melt adhesive or a heat sealant. |
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DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS In accordance with the present invention, by performing a random copolymerization between an .
alpha.
-olefin having 4 to 12 carbon atoms and an aromatic vinyl monomer by maintaining the content of the .
alpha.
-olefin in the range of 50 to 98% by mol, the softening point can be maintained in the range from 40.
degree.
to 150.
degree.
C.
which is suitable for a hot-melt adhesive and the adhesive power to various substrates can be remarkably enhanced while environmental aging resistances such as thermal aging resistance can be remarkably improved.
It is deemed that an improvement in environmental aging resistance in the present invention is due to a fact that substantially all the main chains of the polymer are formed of single bonds between carbon atoms and no double bonds between ethylene-carbon atoms are contained in the main chains, but are contained in side chains.
In the random copolymer of the present invention, alkyl side chains based on an .
alpha.
-olefin having 4 to 12 carbon atoms and aryl (phenyl) side chains based on aromatic vinyl group co-exist randomly, and it is understood that combination of these side chains provides an excellent adhesive power to a substrate and melt flow properties suitable for a hot-melt.
Specifically, the .
alpha.
-olefin having 4 to 12 carbon atoms includes butene-1, pentene-1, hexene-1, heptene-1, octene-1, nonene-1, decene-1, undencene-1, and pentene-1 are preferably used.
The .
alpha.
-olefin may be used alone or a combination of two or more .
alpha.
-olefins may be used.
The aromatic vinyl monomer which constitutes the .
alpha.
-olefin-aromatic vinyl random copolymer specifically includes styrene, alkyl substituted styrene such as .
alpha.
-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, o-ethylstyrene, m-ethylstyrene, p-ethylstyrene, propylene styrene, butylstyrene; halogen substituted styrene such as chlorostyrene and bromostyrene; and vinylnaphthalene such as 1-vinylnaphthalene, 2-vinylnaphthalene, and 1-vinyl-4-methylnaphthalene
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