Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1995-08-18
1997-10-21
Sweet, Mark D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528374, 528376, C08G 6368
Patent
active
056797621
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a block polymer, a thermoplastic addition polymer, and their production process and use.
BACKGROUND ART
Examples of known thermoplastic polymers having two or more polymer segments which are radially extended from a central segment of the polymers are as follows: a hybrid star-shaped polymer having a condensed polymer segment and acrylic addition polymer segments which are radially extended from the condensed polymer segment (Japanese Official Patent Provisional Publication (Kokai) No. Showa 63-132914); a star-shaped polymer having a structure including a diphenylethylene derivative at its center from which three polymer segments formed by polymerization are radially extended (Japanese Official Patent Provisional Publication (Kokai) No. Heisei 3-190911); a star-shaped polymer having a structure in which a polyfunctional crosslinking agent having at least two polymerizable double bonds is included at the polymer center from which two or more polymer segments formed by polymerization are radially extended (Japanese Patent Publication (Kohyo) No. Heisei 5-500827); a star-shaped block polymer formed by photo-initiated radical polymerization utilizing a dithiocarbamate group (Poly. J., vol. 16, p. 511 (published 1984)); a star-shaped block polymer formed by thermal-cleavage radical polymerization utilizing a triphenylmethyl group that is introduced into a terminal of a polymer (Poly. Bull., vol. 16, p. 277 (published 1985)); and so on.
In the above-mentioned conventional star-shaped polymers, the centers of the radial structures derive from the condensed polymer, diphenylethylene derivative, the polyfunctional crosslinking agent, the polyfunctional polymerization-initiator, and the like. Therefore, the combination of the polymer segments is limited, the polymer segments are limited to those which derive from homopolymers, the type of monomer units constituting the polymer segments is limited, or the irradiation of light (ultraviolet rays) is needed and the permeability of monomers in a depth direction is too weak for industrial mass production. Thus, the conventional star-shaped polymers are only utilized in very limited industrial fields and expensive.
In addition, in the above-mentioned conventional star-shaped polymers, blocks of an identical polymer cause phase separation, whereby the transparency is deteriorated and the mechanical strength is weakened.
DISCLOSURE OF THE INVENTION
Objects of the Invention
It is an object of the present invention to provide an inexpensive block polymer which is effectively available in various uses with regard to resins for molding, hot-melt adhesives, hot-melt pressure sensitive adhesives, thermoplastic elastomers, resins for toners, carriers for pressure sensitive adhesive double coated tapes of high strength, water-soluble pressure sensitive adhesives, impact resistance-improving resins, compatibilizers, tackifiers, dispersants, and the like.
It is another object of the present invention to provide a process for easily producing such a block polymer by industrially inexpensive radical polymerization.
It is another object of the present invention to provide a new thermoplastic addition polymer having excellent transparency and mechanical strength, of which the functionality can be enhanced without involving the phase separation, although it is a block polymer.
It is another object of the present invention to provide a process for producing such a thermoplastic addition polymer with industrial ease.
It is another object of the present invention to provide use of the block polymer of the present invention.
It is another object of the present invention to provide use of the thermoplastic addition polymer of the present invention.
SUMMARY OF THE INVENTION
A block polymer of the present invention includes a polyvalent mercaptan segment and two or more polymer segments and has a number-average molecular weight of 2,000 to 1,000,000, wherein the two or more polymer segments are radially extended from the polyvalent mer
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"Living Radical Polymerization of Methyl Methacrylate with a Tetrafunctional Photoiniferter: Synthesis of a Star Polymer", Poly. J., vol. 16, No. 6, pp. 511-514 (1984).
"Living Radical Polymerization in Homogeneous System with Phenylazotriphenylmethane as a Thermal Iniferter", Poly., Bull., vol. 16, pp. 277-284, (1986).
Hasegawa Hiroaki
Kobayashi Nobuhiro
Yoshida Masatoshi
Nippon Shokubai Co. , Ltd.
Sweet Mark D.
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