Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1995-02-14
1997-01-21
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528275, 528283, 528285, 528286, 528302, 528307, 528308, 5283086, 524706, 524710, 524777, 524783, 524784, 524785, C08G 6378
Patent
active
055960685
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/DE93/00565 filed 25 Jun. 1993 and published as WO94/01482 20 Jan. 1994 based upon German national Applications P42 22 244.3 of 7 Jun. 1992 and P43 19 008.1 of 8 Jun. 1993, under the International Convention.
FIELD OF THE INVENTION
Our present invention relates to a polyester resin for producing objects having high transparency and neutral color and containing one or more catalysts in the form of at least one antimony compound and one phosphorus compound, the polyester resin being produced by reacting a dicarboxylic acid with polyhydric alcohols.
BACKGROUND OF THE INVENTION
In a known polyester resin of this kind, the antimony compound is antimony glycolate, a cobalt compound present in the system is cobalt acetate, the phosphorus compound is phosphoric acid, the dicarboxylic acid is terephthalic acid and the polyhydric alcohol is a glycol, namely ethylene. The known polyester resin is used for producing containers, particularly bottles. However these are inevitably relatively thin-walled containers or bottles, because a high rate of crystallization has to be allowed for. Thin walled containers or bottles are throwaway containers or bottles, since they cannot be cleaned sufficiently frequently. Frequent cleaning, as required for containers intended for reuse sufficiently often, especially bottles, quickly results in damage to the thin-walled containers or thin-walled bottles. Examples of thin-walled containers or bottles. Examples of thin-walled containers or bottles are 1.5 liter containers or bottles weighing only 54 g. This is where the invention applies.
OBJECT OF THE INVENTION
It is an object of the invention to provide a polyester resin of the kind described, suitable for producing re-usable hollow members, particularly containers and bottles having adequate wall thickness.
SUMMARY OF THE INVENTION
According to the invention, a polyester resin as previously described additionally contains a germanium compound and cyclohexane dimethanol (CHDM) and the polyhydric alcohols are a mixture of ethylene glycol and at least 0.5% cyclohexane dimethanol.
The composition of the invention is a polyester resin, which, in addition to high transparency and a neutral color, has good resistance to heating and, particularly, a low rate of crystallization. For this reason, the polyester according to the invention can be used to make thick-walled hollow members, especially thick-walled containers or thick-walled bottles which can be re-used often, since they can be frequently cleaned without being damaged in the process. The resistance to heating, particularly the low rate of crystallization, are surprising and result from the presence of a combination of cyclohexane dimethanol and the catalyst. In this connection, according to the invention, the polyester resin can also contain a tin compound. Also the polyester resin can contain a potassium compound and/or a cobalt compound. Admittedly it is known to use cyclohexane dimethanol as comonomer in the production of polyethylene terephthalate, but this does not appreciably affect the problem and solution on which the invention is based.
SPECIFIC DESCRIPTION AND EXAMPLES
Other inventive features are set out hereinafter. The carboxylic acid used can be terephthalic acid or isophthalic acid or a mixture of the two. A polyester resin having optimum high transparency, neutral color, resistance to heating and a low rate of crystallisation, is characterized in that the polyester resins contains In this connection according to the invention, the polyester resin also contains a germanium compound, e.g. in an amount of 1-100 ppm, preferably 10 ppm, measured as elemental germanium.
The invention also relates to a hollow member, more particularly a thick-walled hollow member, manufactured from a polyester resin. In a preferred embodiment of the invention the hollow member or hollow container is a thick-walled bottle.
The formulation for a 100 kg batch is as follows:
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REFERENCES:
patent: 4440924 (1984-04-01), Kuze et al.
patent: 5254288 (1993-10-01), Verheijen et al.
CA:81(8); 38136j.
Nakanishi et al. "Poly(ethylene terephthalate)", 04/18, 2398.
Geier Rudolf
J urgens Theodor
Kleinecke Klaus
Kramer Wolfgang
W ullscheidt Wilhelm
Acquah Samuel A.
Dubno Herbert
John Brown Deutsche Engineering GmbH
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