Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1995-03-24
1997-04-29
Szekely, Peter A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524 8, 524448, C08K 300, C08K 334
Patent
active
056249802
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a thermoplastic cement composition having intermediate properties between those of cements and those of thermoplastics, and provides a thermoplastic cement composition which is usable in a wide industrial field including articles which need heat resistance.
RELATED ART
It has been known to modify a thermoplastic by the addition of an inorganic filler.
However, it has also been known that the heat resistance of a thermoplastic cannot essentially be improved by this means. Further, although the thermoplasticity of a thermoplastic is a property indispensable to molding, it is unnecessary in many cases after molding. A liquid-crystal plastic developed for the main purpose of providing a highly heat-resistant resin is molded at a high temperature. If a plastic which can be molded at a low temperature and is highly resistant to heat is prepared, however, the value thereof will be very large.
Although a thermosetting resin is known to be relatively excellent in heat resistance, this resin is inferior to a thermoplastic in the rate and ease of molding and does not compare with a thermoplastic as a whole, though a thermosetting resin is regarded as of high value by virtue of its in-situ moldability.
Recently, the disposal of waste plastics has become an environmental issue. However, no suitable method for the disposal thereof has been found as yet, so that the development of a new effective method therefor has been expected. Generally, a thermoplastic is lowered in moldability and properties after the first heat cycle, which makes the recycle of a thermoplastic so difficult as to give a large amount of waste plastics.
Although the conversion of waste plastics into an oil through thermal cracking has recently been noted as a technique for recycling waste plastics, this technique has problems that this oil is more costly than ordinary fuel oils, that the sorting of waste plastics is necessary, and that the cracking residue must be secondarily disposed of. Under these circumstances, it has been expected to develop a technique for recycling waste plastics which uses a waste plastic itself as the raw material and can be applied to a waste plastic contaminated with other plastics and/or foreign matters.
Meanwhile, precast concrete has problems that the molding cost is high and that the curing takes a long time, so that concrete is far inferior to thermoplastic in molding cost. It is conceivable that these problems will be solved, if precast concrete can be produced thermoplastically, but no thermoplastically moldable concrete has been put on the market as yet.
As described above, it has been a practice in the prior art to add an inorganic filler to a thermoplastic for the purpose of weight gain, improvement in heat or pressure resistance, and so forth. However, mere addition of a hydraulic or air-hardening cement to a thermoplastic fails in modifying the thermoplastic.
This is because mere addition of a cement to a thermoplastic causes the cement to be enveloped in the thermoplastic and prevented from undergoing hydration or air hardening, so that the cement functions only as a filler. In such a case, a thermoplastic is not improved in heat resistance at all and deteriorates in moldability, because the filler added serves only to lower the melt index.
DISCLOSURE OF INVENTION
The inventors of the present invention have applied the technique of polymer alloys to the preparation of a blend of a thermoplastic with a cement component and have found that the use of a substance which can impart hydrophilicity to a thermoplastic resin so as to permit the hydration of a cement component contained therein brings about success in developing a plastic cement composition which can easily be processed thermoplastically in molding and loses its thermoplasticity when the cement component absorbs water to harden. The present invention has been accomplished on the basis of this finding.
Namely, the present invention relates to a thermoplastic cement composition comprising 100
REFERENCES:
patent: 3043790 (1962-07-01), Sanders
patent: 3634293 (1972-01-01), Bonitz
patent: 4614755 (1986-09-01), Rodgers
patent: 4746365 (1988-05-01), Babcock et al.
patent: 4842650 (1989-06-01), Blounts
Mitsui & Co. Ltd.
Szekely Peter A.
Tobuchemicals, Inc.
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