Use of calcium hypophosphite

As a filler to increase mechanical properties of a polyamide composition

ABSTRACT
The present invention discloses the use of a heat stabilized calcium hypophosphite as a filler to increase the mechanical properties of a polyamide composition. Said composition may also comprise reinforcing and/or bulking filler and/or impact modifier agents. The invention permits to obtain polyamide composition providing very good mechanical performances with the use of a calcium hypophosphite having a low degree of phoshpine generation.
CLAIMS (OCR text may contain errors)

WHAT IS CLAIMED IS:
1. Use of a heat stabilized calcium hypophosphite as a filler to increase the mechanical properties of a polyamide composition; said calcium hypophosphite is so heat stabilized that, when it is heated during 3 hours at 298°C under a flow of argon flushing at rate 58 mL/min, it generates less than 0.5 mL of phosphine per gram of calcium hypophosphite.
2. The use of claim 1 in which the heat stabilized calcium hypophosphite is stabilized by a method comprising the steps of:
step a) washing a calcium starting hypophosphite at least one time under a controlled value of pH comprised between 4 and 11 , said calcium hypophosphite being in an aqueous solution and/or in a solid state, and
step b) drying the calcium hypophosphite as obtained after the washing operation(s) of step (a) under reduced pressure to remove the volatiles.
3. The use according to claim 1 or 2 in which the polyamide composition comprises from 0.1 to 15% by weight of calcium hypophosphite, relative to the total weight of the composition.
4. The use according to anyone of claims 1 to 3 in which the polyamide composition comprises a semicrystalline or amorphous polyamides or copolyamides. 5. The use according to anyone of claims 1 to 4 in which the polyamide is selected from the group consisting of polyamide 6, polyamide 66, polyamide 610, polyamide 1 , polyamide 12, polyamide 612, poly(meta-xylylenediamine) (MXD6), polyamide 66/6T, polyamide 66/61, and blends and copolyamides. 6. The use according to anyone of claims 1 to 5 in which the composition comprises from 10% to 90% by weight of polyamide, relative to the total weight of the composition.
7. The use according to anyone of claims 1 to 6 in which the composition comprises at least a reinforcing and/or bulking filler. 8. The use according to anyone of claims 1 to 7 in which the composition comprises at least an impact modifier agent.
9. Composition comprising at least a poiyamide, a heat stabilized calcium hypophosphite and an impact modifier agent, said calcium hypophosphite is so heat stabilized that, when it is heated during 3 hours at 298°C under a flow of argon flushing at rate 58 mL/min, it generates less than 0.5 mL of phosphine per gram of calcium hypophosphite.
10. A method for increasing mechanical properties of a poiyamide composition in which a heat stabilized calcium hypophosphite is added to said poiyamide composition, said calcium hypophosphite is so heat stabilized that, when it is heated during 3 hours at 298°C under a flow of argon flushing at rate 58 mL/min, it generates less than 0.5 mL of phosphine per gram of calcium hypophosphite.
DESCRIPTION (OCR text may contain errors)
USE OF CALCIUM HYPOPHOSPHITE AS A FILLER

TO INCREASE MECHANICAL PROPERTIES OF A POLYA IDE

COMPOSITION

The present invention concerns the use of a heat stabilized calcium hypophosphite as a filler to increase the mechanical properties of a polyamide composition. Said composition may also comprise reinforcing and/or bulking filler and/or impact modifier agents. The invention permits to obtain polyamide composition providing very good mechanical performances with the use of a calcium hypophosphite having a iow degree of phosphine generation.

INVENTION

The applicant has discovered that the use of a specific heat stabilized calcium hypophosphite, in polyamide-based compositions makes it possible to increase the mechanical properties said compositions, thus making it possible to act as a filler. An optimum level of compromise between mechanical properties is in particular obtained when the polyamide composition comprises from 0.1 to 15% by weight of said calcium hypophosphite, relative to the total weight of the composition.

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