Chemistry of inorganic compounds – Carbon or compound thereof – Oxygen containing
Patent
1997-05-01
1999-12-07
Lewis, Michael
Chemistry of inorganic compounds
Carbon or compound thereof
Oxygen containing
4231795, C01B 3130
Patent
active
059978368
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an alkali aluminum complex hydroxide carbonate salt having a lithium aluminum complex-type or dawsonite-type crystal structure, a process for producing said salt, and its uses. More specifically, it relates to an alkali aluminum complex hydroxide carbonate salt which is useful as a heat stabilizer (halogen trapping) for olefin resins containing a chlorine-containing polymer or halogen-containing catalyst residues, and an anti-blocking agent or a warmth-retaining agent (infrared absorbing agent) of a thermoplastic resin film, and a process for producing said salt.
The present invention also relates to uses of the above-mentioned salt. It especially relates to a resin compounding agent which is easy to compound in film-forming resins and can form warmth-retaining resin films having excellent infrared absorbability and transparency.
BACKGROUND TECHNOLOGY
Chlorine-containing polymers such as a vinyl chloride polymer are liable to be colored by heat-decomposition reaction such as de-hydrochlorination or to be reduced in mechanical properties in heat molding processing or subsequent heat histories. To prevent the above troubles, it is generally required to compound stabilizers.
Olefin-type resins produced by using Ziegler-type catalysts contain halogen-containing catalyst residues. These residues generate hydrogen chloride at the time of heating and molding to cause rust in the molding machines or generate deterioration in the resins, for example, yellowing. To prevent this deterioration, stabilizers which trap hydrogen chloride were compounded widely.
The use of hydrotalcite as such a stabilizer has been knonwn from old. For example, Japanese Laid-Open Patent Publication No. 80445/1980 describes that hydrotalcite is used as a stabilizer for halogen-containing resins. Further, Japanese Patent Publication No. 36012/1983 shows that a .beta.-diketone compound and a hydrotalcite of formula (1) or SO.sub.4.sup.2-, and m represents a positive number are compounded in a halogen-containing resin.
Furthermore, Japanese Patent Publication No. 30737/1984 discloses that at least 0.01% by weight of a complex compound represented by general formula (2) and z represent a positive number, and a is zero or a positive number, residues produced by using a Ziegler-type catalyst.
Hydrotalcites are non-toxic complex hydroxide and carbonate salts of magnesium and aluminum, have excellent heat stability, and are transparent when compounded in a polymer.
These hydrotalcites ideally have a chemical composition expressed by formula (3)
However, Mg and Al, within a very broad range, form a solid solution as shown by formula (1) or (2), and there is a problem in that it is difficult to form a composition having a strictly constant composition.
A report of C. J. Serna et al. entitled "Crystal-Chemical Study of Layered [Al.sub.2 Li(OH).sub.6 ].sup.+ X.sup.-.nH.sub.2 O" (Clays and Clay Minerals, Vol. 25, page 384 (1977)) describes that a lithium aluminum complex hydroxide salt is synthesized by adding a benzene solution of aluminum tri(sec-butoxide) (ASB) as liquid drops to an excessive aqueous solution of lithium carbonate, hydrolyzing ASB, washing the resulting gel, and thereafter, hydrothermally treating the washed gel for several days at 130.degree. C.
A report of I. Sissoko et al. entitled "Anion Intercalation and Exchange in Al(OH).sub.3 -Derived Compounds" (Journal of Solid State Chemistry, Vol. 25, pages 283-288 (1985) describes that a lithium aluminum complex hydroxide salt is produced by adding AlCl.sub.3 as liquid drops to an aqueous solution containing LiOH and Na.sub.2 CO.sub.3 (or Na.sub.2 SO.sub.4), changing the pH from 13 in the early period to 10.2 in the last stage to form a gel-like precipitate, and aging the precipitate with stirring (see Comparative Example 6 and FIG. 6 to be given below).
U.S. Pat. Nos. 4,116,856 and 4,221,767 disclose that crystals of lithium. aluminum complex hydroxide salt are produced by reacting amorphous Al(OH).sub.3 or crystalline hydrated alumina (such
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Chemical Abstracts, 76, No. 16, Apr. 17, 1972, Abstract No. 87929.
Higuchi Katsumi
Komatsu Yoshinobu
Kondo Masami
Sato Teiji
Tatebe Akira
Hendrickson Stuart L.
Lewis Michael
Mizusawa Industrial Chemicals Ltd.
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