Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
1998-05-07
2001-05-29
Niland, Patrick D. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C523S333000
Reexamination Certificate
active
06239196
ABSTRACT:
TABLE OF CONTENTS
1. BACKGROUND OF THE INVENTION
1.1. Technical Field
1.2. Description of Related Art
2. SUMMARY OF THE INVENTION
3. DESCRIPTION OF THE PREFERRED EMBODIMENTS
3.1. Examples 1 to 5
3.2. Examples 6 to 8
3.3. Examples 9 and 10
3.4. Examples 11 and 12
3.5. Examples 13 to 16
4. CLAIMS
5. ABSTRACT OF THE DISCLOSURE
6. DECLARATION AND POWER OF ATTORNEY
1. BACKGROUND OF THE INVENTION
1.1. Technical Field
The invention relates to a process for the preparation of a material comprising a filler of solid particles dispersed in a polymer by extrusion of a composition prepared by mixing the said filler with particles or granules of the said polymer, the material itself, and useful shaped articles such as motor vehicle fascia or dashboards which can be fabricated from the said material. The subjects matter of the invention appear in the claims.
1.2. Description of Related Art
The incorporation of a solid filler in a polymer makes it possible to improve some of properties of said polymer, such as to increase its stiffness and its deformation temperature under load and to modify its appearance, such as its coloration. Furthermore, in the case of a semi-crystalline thermoplastic polymer, the presence of a solid filler within it makes it possible to reduce the shrinkage during its cooling, for example after it has been processed while hot, for example by extrusion, injection or blow moulding.
However, this incorporation of the filler is also generally reflected by a harmful influence on some properties of the polymer, such as a decrease in its impact strength and a reduction in its elongation at break.
This influence of the solid filler on the stiffness, the deformation temperature under load, the impact strength and the elongation at break increases as the level of solid filler increases and as the aspect ratio of the filler increases. Aspect ratio is understood to mean the mean ratio of the greater particle dimension to the smaller particle dimension.
Australian patent application AU 9513195 describes a process for incorporating talc in a thermoplastic. This process involves numerous stages and in particular the preparation of granules obtained by compressing a talc/water/polyethylene glycol or polypropylene glycol mixture before incorporating the said granules in the thermoplastic. This process is only used to facilitate the handling of the talc powder and produces, as regards the final material, a result identical or indeed inferior to that obtained by direct dispersion of the starting powder in the molten polymer. According to this process, the granules are preferably dried so as to remove the water therefrom until a residual moisture percentage by weight of less than 0.5% of water with respect to the weight of dry talc is reached. This process requires the use of polyethylene glycol or polypropylene glycol. Due to the proportions indicated of talc and of water, the talc is never in the suspended state at any time in the process described in this document.
2. SUMMARY OF THE INVENTION
Accordingly, it is the first object of the present invention to provide a process for the preparation of a material comprising a filler of solid particles dispersed in a polymer by extrusion of a composition prepared by mixing an aqueous suspension or dry mixing of said filler with particles or granules of said polymer.
It is the second object of the present invention to provide a polymerization material comprising at least one propylene polymer and at least one filler of solid particles, wherein said filler of solid particles dispersed in said polymer by extrusion of a composition prepared by mixing an aqueous suspension of said filler with particles or granules of said polymer.
It is the third object of the present invention to provide an article obtained by conversion of a polymerization material comprising a filler of solid particles dispersed in a polymer by extrusion of a composition prepared by mixing an aqueous suspension of said filler with particles or granules of said polymer.
There are other objects of the present invention as well as the advantages thereof can be understood by referring to the following disclosure and claims.
The foregoing objects are coherent according to the present invention which relates to a process for the preparation of a composition to be extruded comprising a polymer and a filler of solid particles comprising a stage of mixing the filler of solid particles with particles or granules of the said polymer, if appropriate in the form of an aqueous suspension.
The invention is particularly simple, and the final material is in better mechanical properties than those obtained by direct incorporation of the solid filler in the polymer or copolymer. This improvement is very substantial, in particular with regard to the impact strength of the final material. The invention also relates to a polypropylene-based composition comprising a filler of solid particles, such as kaolin, exhibiting a high flexural modulus and a good impact strength.
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patent: 4913774 (1990-04-01), Goguelin
patent: 5667580 (1997-09-01), Bäbler
patent: 9513195 (1995-07-01), None
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Bussi Philippe
Thierry-Mieg Jérôme
Appryl S.N.C.
Niland Patrick D.
Pennie & Edmonds LLP
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