Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1999-05-07
2000-11-07
Sanders, Kriellion
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524343, 524399, 524400, 524413, 524434, 524436, 524563, 524567, 524568, 524570, 2523677, 25240052, 25240053, 25240061, C08K 536, C08K 513, C08K 504, C08K 509, C08K 310
Patent
active
061438146
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a fusible stabilizer combination for thermoplastic polymers having the characteristics of the main claim.
A halogen-containing thermoplastic resin, such as, for example, polyvinyl chloride (PVC) changes into a polyene structure when a melt-forming process is carried out, whereby hydrochloric acid is eliminated and the polymer is colored. It is conventional to work in metal carboxylates as stabilizers into the resin, in order to improve the thermostability of the polymers. Because, however, an incorporation of the stabilizers alone can lead to so-called metal burning during longer melt-forming processes, which imparts a blackening to the polymer, it is a general practice to incorporate a co-stabilizer.
Because basic lead salts, as well as other heavy-metal-containing stabilizers, are characterized as toxic, it has been attempted to discover stabilizer alternatives. A number of combinations of inorganic and organic compounds are known to be stabilizers for polymers.
Hydrotalcites are proposed as stabilizers in DE 30 19 632 and EP 189 899. These compounds are superior to mixtures of Ca/Zn-metal carboxylate with respect to heat stability and transparency.
Stabilizers produced by use of hydrotalcites cannot be produced according to a melt or fusion process because their content of inorganic and nonfusible components exceeds 50-60%. For this reason, nontoxic stabilizer combinations in the form of tablets, flakes, or melt granules, particularly those for stabilizing PVC films, cable insulations, or wire coatings, do not presently exist.
Most mixtures of Ca/Zn metal carboxylates, in combination with co-stabilizers and lubricants, can be produced in a variety of forms for delivery including powders, pastes, granulates, flakes, or tablets. The powder form has proven to be less advantageous because stabilizer combinations in this delivery form, at best, present electrostatic charge problems and lead to de-homogenization because the differing pouring weights of the components' can lead to sedimentations. While the paste form is free of dust, it demands special dosaging techniques. In addition, pastes can also de-homogenize. Granulates are also dust-free but are, however, disadvantageous in that, for particular applications, such as, for example, in thin films, cable, or wire coatings, particularly insolation, problems result due to the agglomerates left by processing.
DE 13 00 105 describes the production of metal soaps by a process in which, at a temperature of from 120-140.degree. C., the corresponding carboxylic acids are made in a melt with metal oxides, metal hydroxides and acids volatile in metal soaps. One must distinguish between metal soaps that have a sharp melting point (Type I), such as lead, cadmium, zinc, and magnesium stearate, which produce a thin, flowing melt at these temperatures, and those which do not melt above 140.degree. C. or revert to a plastic state, such as double basic lead, calcium, barium, and aluminum stearates (Type II). In the disclosed process, metal soaps of Type II are produced in a melt of metal soaps of Type I or in an excess of carboxylic acid from the corresponding metal oxides, hydroxides, and acids that are volatile in metal soaps. The carboxylic acid excess subsequently converts to a metal soap Type I by means of reaction with a corresponding metal oxide, hydroxide, and acid volatile in metal soaps. The relative quantities amount to 10-40 wt % of Type I metal soap and 60-70% Type II metal soap. Metal soaps which are produced by the process described in DE 13 00 105 have no components which melt above 200.degree. C. or do not melt, and are inferior to the stabilizer combinations of the present invention in stability.
In addition, DE 17 94 429 describes a process for producing dust-free stabilizer-lubricant combinations for halogen-containing polymers, based on metal soaps and lead compounds that are characterized as repro-toxic.
DE 43 05 944 describes basic calcium-zinc-mixed soaps that are dissolved or suspended in a lubricant. Basic metal soaps clai
REFERENCES:
patent: 5451628 (1995-09-01), Baker
Dolleschal Klaus
Ebner Paul
Hensel Hartmut
Lattacher Emil
Pacher karoline
Chemson Polymer-Additive Gesellschaft mbH
Sanders Kriellion
LandOfFree
Fusible stabilizer combination does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fusible stabilizer combination, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fusible stabilizer combination will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1641810