Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1999-01-08
2000-10-24
Szekely, Peter A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
427220, 427224, 427409, 428407, 523218, C08K 902, C08K 904, C08J 732, A32B 516, B05D 136
Patent
active
061368911
DESCRIPTION:
BRIEF SUMMARY
This application is an application under 35 U.S.C. Section 371 of International Application Number PCT/FR97/00396, filed on Mar. 6, 1997.
The present invention relates to composite particles including a core based on at least one organic polymer and a skin based on at least one oxide and/or at least one hydroxide of aluminium, silicon, zirconium, zinc, and/or a transition metal.
The invention also relates to processes for preparing such particles and their use as fillers or additives for plastics or elastomers.
The invention still further relates to the use of said composite particles for preparing hollow particles comprising a skin based on at least one oxide and/or hydroxide of aluminium, silicon, zirconium, zinc, and/or a transition metal; these hollow particles too can be used as fillers or additives for plastics and elastomers.
In order to endow thermoplastic materials with high rigidity, it is known to introduce solid mineral particles. However, it has been shown that such reinforced plastics do not have sufficient mechanical properties (for example impact resistance) particularly at low temperatures.
Further, the introduction of mineral fillers in the form of particles of silica or carbon black into elastomers, in particular into elastomers for tyres, is known in order to improve the tear strength and abrasion resistance of those elastomers. However, such reinforced tyres lack flexibility at low temperatures.
The present invention thus provides composite particles constituted by a core comprising at least one organic polymer, at least partially coated with one or more layers comprising at least one oxide and/or at least one hydroxide of aluminium, silicon, zirconium, zinc, and/or a transition metal.
The present invention also provides a process for preparing composite particles comprising the following steps: bringing at least one organic polymer into contact with at least one hydrolysis catalyst, in suspension, then adding at least one aluminium, silicon, zirconium, zinc, and/or transition metal alkoxide, then separating and drying the composite particles obtained.
The invention also provides a process for preparing the composite particles defined above comprising the following steps: bringing at least one organic polymer into contact, in suspension, with at least one precipitating agent and at least one soluble aluminium, silicon, zirconium, zinc, and/or transition metal salt simultaneously, then separating and drying the composite particles thus obtained.
The present invention still further concerns the use of the composite particles to obtain hollow particles.
Finally, the invention concerns the use of composite particles, also of hollow particles, as fillers or additives in plastics and elastomers.
Further characteristics, details and advantages of the invention will become clear from the following description and examples.
Firstly, the invention concerns composite particles composed of a core based on at least one organic polymer, at least partially coated with an oxide and/or hydroxide of aluminium, silicon, zirconium, zinc, or a transition metal, the elements defined above being present alone or as a mixture, in one and/or other of the two forms.
More precisely, the oxide and/or hydroxide based coating (or equally, skin, layer) can only partially or completely coat each organic polymer core. It is also possible for the coating to be partially incrusted in the outer peripheral layer of the organic polymer core.
In an important variation of the present invention, an intermediate layer essentially based on an alkaline-earth metal hydroxide exists between the organic polymer-based core and the coating defined above.
The organic polymers forming part of the composition of the composite particles are latex type particles, i.e., particles of (co)polymers from conventional processes for emulsion (co)polymerisation of copolymerisable organic monomers.
Non limiting examples of (co)polymers forming part of the composition of the composite particles are those resulting from the polymerisation of the fol
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Chopin Thierry
Dupuis Dominique
Labarre Dominique
Mur Gilles
Rhodia Chimie
Seugnet Jean-Louis
Szekely Peter A.
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