Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1997-03-10
1999-03-30
Truong, Duc
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528 75, 528 80, 528 81, 528492, 528503, 522 75, 522 79, 522 90, 522134, 264 451, 264 77, 264236, C08G 6308
Patent
active
058891404
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a crosslinkable or curable-type polylactone-based composition, a polylactone-based crosslinked or cured molded article therefrom, and its production method and applications.
The polylactone-based crosslinked or cured molded article offered by the present invention has biodegradability as well as excellent physical properties such as mechanical properties, thermal resistance, oil resistance and abrasion resistance, and shape-memorizable property that while an article deforms showing rubber elasticity on applying an external force when it is heated to soften, and it keeps the deformed shape when it is cooled as it is deformed to solidify, it tends to recover its initial shape when it is reheated to soften. Thus, various uses applying these properties are offered.
BACKGROUND ART
Japanese Patent Publication (Kokai) No. 279445/1993 describes that a film-form molded product, a fiber or the like of a polycaprolactone composition containing a small amount of urethane bonds can be produced by melt blending a polyvalent isocyanate of 0.1 to 5% parts by weight to a polycaprolactone of 100 parts by weight.
Japanese Patent Publication (Kokai) No. 279445/1993 describes that since the presence of gel may cause problems such as fish eye, filament break, or reduction of moldability due to plugging by gel in the nozzle, the amount of polyisocyanate added must be less than 5 parts by weight to a polycaprolactone of 100 parts by weight. Such publicly-known conventional techniques have failed to offer molded products in which polylactone is crosslinked or cured, but considered only partial improvement, for instance, improvement of melt tensile strength by reacting the terminated-hydroxyl group of polylactone with a small amount of isocyanate. Accordingly, a polylactone with rubber elasticity in softened state by heating or shape memorizable property on a satisfactory level has not been obtained, and naturally application development requiring such new functions has not been made yet.
DISCLOSURE OF THE INVENTION
As a result of the intense study on the above-mentioned subjects, namely, (1) to obtain a polylactone-based molded article with rubber elasticity in softened state by heating and shape-memorizable property on a satisfactory level, and (2) to establish a production method of the above-mentioned polylactone molded article, the present inventors have found that a polylactone-based crosslinked molded article with the above-mentioned functions could be obtained by confining a polylactone chain through the crosslinking structure formed by using a polylactone (A) whose number average molecular weight is in the range of 10,000 to 300,000 and a specific crosslinkable monomer (B) and found a production method of molded articles such as sheet, film, fiber, tray, bottle, bag, etc. The degree of confinement of the polylactone molecular chain can be expressed in terms of later-mentioned "recovery ratio" expressing the shape-memorizable property of the polylactone-based crosslinked molded article to be obtained, and the "confinement in the present invention means the recovery ratio of 80% or higher.
Further, as a result of the intense study on the cured polylactone, the present inventors also found that a cured polylactone-based molded article of sheet, bottle, film, etc. which has excellent physical properties such as mechanical properties, thermal resistance, oil resistance and abrasion resistance as well as shape-memorizable property could be obtained by molding a curable polylactone-based composition formulated with a specific curing agent of various types that can react with a hydroxyl group in a specific lactone-based composition to complete the present invention.
Namely, according to a first aspect of the present invention, there is provided a crosslinkable polylactone-based composition comprising 100 parts by weight of a polylactone (A) whose number average molecular weight is in the range of 10,000 to 300,000 formulated with 0.1 to 30 parts by weight of a crosslinkable m
REFERENCES:
patent: 4629779 (1986-12-01), Koleske
patent: 4725653 (1988-02-01), Koleske
Daicel Chemical Industries Ltd.
Truong Duc
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