Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1983-07-20
1985-10-08
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
422131, C08G 6906
Patent
active
045461716
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of continuously polycondensing a higher aliphatic .omega.-amino acid and an apparatus used therefor.
BACKGROUND ART
Polyundecaneamide (nylon 11) and polydodecaneamide (nylon 12) obtained from 11-aminoundecanoic acid and 12-aminododecanoic acid (these raw materials are also called .omega.-amino acids) have excellent low temperature impact resistance, chemical resistance, etc., and hence are convenient for many industrial uses.
Nylon 11 or nylon 12 made from an .omega.-amino acid is obtained by suspending particles of a powder of granules of the .omega.-amino acid in water to form a suspension, heating the suspension to evaporate the water and melt the .omega.-amino acid, and polycondensing the obtained melted .omega.-amino acid (British Pat. No. 790,170).
Since this method employs water, a large quantity of heat energy is required to evaporate the water and polymerize the .omega.-amino acid. Therefore, it has been proposed that the .omega.-amino acid is polycondensed directly, without water. However, unlike a batch polycondensation method, a continuous polycondensation method has the problem that the polycondensation cannot be smooth and continuous since the .omega.-amino acid is in the form of particles of a powder or granules, and since the polycondensation reaction takes place immediately after the .omega.-amino acid has been melted.
Accordingly, in order to turn a higher aliphatic .omega.-amino acid into a polymer with a reduced quantity of energy, the appearance of such a method and apparatus has been desired for continuously as well as smoothly polycondensing particles of .omega.-amino acid without suspending them in water. The present invention has been completed in accordance with the above background.
DISCLOSURE OF INVENTION
The method in accordance with the invention comprises:
enveloping particles of a powder or granules of .omega.-amino acid consisting of 11-aminoundecanoic acid and/or 12-aminododecanoic acid in a gas which is inert with respect to said particles, supplying said particles enveloped in said inert gas to a melting device without providing any liquid with said particles, melting said particles, supplying immediately the obtained melt to a polycondensation reactor, and polycondensing the melted .omega.-amino acid.
In particular, the supply of the melt to the polycondensation reactor is completed within 20 minutes after the particles start to melt.
In addition, in order to realise this method effectively, the following apparatus is employed: a polycondensation reaction apparatus including two major elements which are a melting device for melting the particles of .omega.-amino acid consisting of 11-aminoundecanoic acid and/or 12-aminododecanoic acid to obtain a melt, and a tubular polycondensation reactor connected to the melting device without or with passing through ductwork to polycondense the melt immediately. The melting device of this apparatus for continuously polycondensing a higher aliphatic .omega.-amino acid also has the following elements: or granules and frustoconical or pyramid-shaped bottom portion, the truncated portion of which composes an outlet for discharging the particles; of the outlet; and outlet and is continuous therewith, which incorporates therein a lattice hotplate, and which has a cross-sectional area equal to or larger than that of the outlet.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a side elevation of the apparatus in accordance with the invention, and FIG. 2 is a longitudinal section of the melting device.
FIG. 3 is a graph showing how rapidly the powder or granules of .omega.-amino acid are polycondensed after being melted.
BEST MODE FOR CARRYING OUT THE INVENTION
The construction of the apparatus in accordance with the invention will be described first, followed by details of the method of the invention employing the apparatus.
The apparatus of the invention comprises two major elements, i.e., a melting device A and a polycondensation reactor B. The melting device A is designed to
REFERENCES:
Partial Translation of French Patent 983,966, Gregory et al, 2.51.
Partial Translation of Kogyo Nylon, Nov. 1960, Jiro.
Kogyo Nylon, 11.60, p. 50, Jiro.
Gotah Eizo
Komuro Yoshiyuki
Tomishima Takeshi
Tsutsumi Tadao
Anderson Harold D.
Miller Austin R.
Toray Industries Inc.
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