Organic compounds -- part of the class 532-570 series – Organic compounds – Aluminum containing
Patent
1993-08-06
1994-05-17
Shaver, Paul F.
Organic compounds -- part of the class 532-570 series
Organic compounds
Aluminum containing
546 2, 524 99, 524399, C07F 506, C07F 304, C08K 504, C08K 509
Patent
active
053129415
DESCRIPTION:
BRIEF SUMMARY
The invention relates to basic calcium aluminum hydroxide dicarboxylates, a process for their production and their use as stabilizers for halogen-containing thermoplastic resins, in particular polyvinyl chloride.
Thermoplastic halogen-containing resins, in particular PVC, are instable to the influence of heat and light. A thermal decomposition occurs e.g. during processing of e.g. unstabilized PVC. This manifests itself in a discolouring of the shaped article and in the deterioration of the mechanical properties. In order to exclude this disadvantage, it is necessary to incorporate heat stabilizers into the resin composition. For this purpose, organic and/or inorganic compounds of the metals lead, barium, cadmium, calcium, tin and zinc are customarily added alone or in combinations. Moreover, other co-stabilizers such as epoxides, organic sulphur compounds, polyols and phosphites are still added.
Basic lead compounds are preferably used to stabilize PVC articles, such as pipes, plates, profiles and cable insulations. The most frequently used basic lead compounds are of the sulphate, phosphite or stearate type.
DE-PS 12 19 223 and DE-OS 24 19 379 teach that PVC cable insulations are to be preferably stabilized with 2-basic lead phthalate, since this compound imparts excellent electrical properties to the cable.
It is mentioned in EP-A- 0 313 113 that 4-basic lead fumarate is the most effective basic lead compound for stabilizing plasticized halogen-containing vinyl polymer compositions. According to EP-A- 0 319 086, 5-basic lead fumarate imparts a higher stability and a better degree of whiteness to shaped PVC articles than other known lead stabilizers.
The organic and/or inorganic compounds of the heavy metals lead, barium and cadmium are classified as toxic. For this reason, it has been attempted for a long time to replace them by non-toxic compounds. The stabilizers on the basis of combinations of calcium and zinc carboxylates which are considered to be non-toxic are insufficient in their effectiveness in most fields of application. Their disadvantages manifest themselves in an insufficient long-term stability and/or an unsatisfactory initial colour and colour retention. The combination of these metal soaps with effective co-stabilizers, which improve the initial colour and long-term stability, is consequently imperative. It is described in FR-A 2 403 362 to stabilize plasticized PVC for cable insulations with a mixture of calcium zinc fatty acids, sorbitol and a .beta.-diketone. EP-A-0 256 872 describes the use of hydrotalcite and a .beta.-diketone for stabilizing PVC resins. The use of alkali alumo silicates in connection with other co-stabilizers in PVC was also suggested (DE-A- 31 13 442).
However, all non-toxic stabilization systems suggested so far have disadvantages as compared with heavy-metal-containing stabilizers. They mostly do not have the necessary long-term stability. A good initial colour and a sufficient colour retention can only be achieved by using large amounts of expensive "colour improver". The metal-containing co-stabilizers hydrotalcite and zeolite are disadvantageous in that they split off volatile components at the processing temperatures necessary for the processing of PVC, for instance, which leads to a bubble formation in the shaped part. Moreover, shaped parts stabilized with e.g. polyol and/or zeolite absorb water, which leads to considerable problems during the further processing.
DE-A- 40 02 988 (prior art within the purview of Section 3 II of the German Patent Act) describes basic calcium aluminum hydroxide dicarboxylates of the formula combinations thereof, halogen-containing thermoplastic resins.
The invention is based on the object of providing new compounds and a process for their production, which are particularly suited as a stabilizer for halogen-containing polymers without having the aforementioned disadvantages of the known stabilizers, and are in particular considered as non-toxic.
This object is attained on the one hand by providing basic calcium aluminum hydr
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Beck Reinhard
Kurzinger Alfred
Purzer Albert W.
Razvan Coriolan
Rosenthal Michael
Barlocher GmbH
Shaver Paul F.
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