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| Water-tight electric cable |
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| Longitudinally water-tight cables |
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| Novel water-absorbing acrylic fibers |
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| Stoma seal adhesive |
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Thermoplastic compositions with very high content of pulverulent mineral materials for incorporation into polymers
| Details |
Inventors: Seinera, Henri; Luberne, Patricia; Stock, Claude; Trouve, Patrick;
Assignee: Pluess Staufer A. G. (Oftringen, CH)
Primary Examiner: Lilling; Herbert J.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland & Maier
Coherent thermoplastic aggregates with very high content of pulverulent mineral materials, said aggregates comprised of the said mineral materials, further of polyolefin polymers and/or copolymers, and possibly additionally of miscellaneous known additives; characterized in that, with the aim of achieving a density near to or at most equal to the theoretical density of the pulverulent mineral materials entering into their composition, while still having excellent compatibility with the polymers of redispersion, i.e., the polymers into which the subject aggregates are to be mixed, the interparticle voids between the grains of the mineral materials, which grains are basically in contact with each other, are at most filled--in the presence of a fluidifacient agent--by at least one polyolefin polymer and/or copolymer having a fusion temperature and/or softening temperature at least equal to 60.degree. C., and having a fluidity index (ASTM 1238) of at least 50. |
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DETAILED DESCRIPTION In the face of the above-mentioned drawbacks, the present Applicant has conducted research, and has developed, by a novel combination of means which may or may not have been known, plastic compositions or aggregates with a very high content of pulverulent mineral materials, with said pulverulent materials having a particle size distribution such that 95% of the particles have at least one dimension <30 microns.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention concerns coherent thermoplastic aggregates having a very high content of pulverulent materials and being comprised of the pulverulent materials as well as of polyolefin polymers and/or copolymers, and possibly, in addition, of miscellaneous known additives.
The aim of the invention is to achieve a density near to or at most equal to the theoretical density of the pulverulent mineral materials entering into their composition, while still having excellent compatibility with the polymers of redispersion, i.
e.
, the polymers into which the subject aggregates are to be mixed.
The interparticle voids between the grains of the mineral materials, which grains are basically in contact with each other, are at most filled--in the presence of a fluidifacient agent--by at least one polyolefin polymer and/or copolymer having a fusion temperature and/or softening temperature at least equal to 60.
degree.
C.
, and having a fluidity index (ASTM 1238) of at least 50.
According to the standard of ASTM 1238, the fluidity index characterizing the polymer and/or copolymer according to the invention is the amount of polymer and/or copolymer (in grams per 10 min) which, at a selected temperature in the interval limited by the softening and transformation temperatures, flows from a given standard charge (2.
16 kg, 5 kg, 10 kg, or 21.
6 kg) through a die orifice of established diameter (2.
09-2.
10 mm) within a measured period of time.
If the granules according to the prior art are fabricated from mixtures comprised of pulverulent mineral materials, at least one polyolefin polymer and/or copolymer, and possibly additional miscellaneous known additives, it is noted that according to the prior art the polymers and/or copolymers used are always chosen from among those having an index of fluidity <50 under the conditions of ASTM 1238
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Adhesives and Rubbers 
