Claims
- 1. Casting composition for producing white molded articles comprising a curable syrup which contains a liquid monomer and optionally prepolymer components dissolved therein, and an inorganic filler, characterized in that the inorganic filler includes a quartz sand product, the individual grain of which consists in the core essentially of quartz and at the surface essentially of .alpha.-cristobalite.
- 2. Casting composition as defined in claim 1, characterized in that the proportion of the .alpha.-cristobalite in the total grain is on average approximately 1 to approximately 25% by weight.
- 3. Casting composition as defined in claim 2, characterized in that the proportion of the .alpha.-cristobalite in the total grain is on average approximately 3 to approximately 15% by weight, in particular approximately 10% by weight.
- 4. Casting composition as defined in claim 1, characterized in that the grain surface is substantially intact and smooth.
- 5. Casting composition as defined in one of claim 1, characterized in that the grain shape of the quartz sand product is an essentially unbroken grain shape.
- 6. Casting composition as defined in claim 1, characterized in that the quartz sand product has a grain size distribution with predominance in the range of 100 .mu.m to 500 .mu.m.
- 7. Casting composition as defined in claim 1, characterized in that the quartz sand product has a whiteness L>60, measured in accordance with German industrial standard 55981.
- 8. Casting composition as defined in claim 1, characterized in that the quartz sand product has as a-value the absolute value <0.6, preferably <0.2, measured in accordance with German industrial standard 55981.
- 9. Casting composition as defined in claim 7, characterized in that the b-value has an absolute value of <2, preferably <1.2, measured in accordance with German industrial standard 55981.
- 10. Casting composition as defined in claim 1, characterized in that the grain of the quartz sand product is silanized.
- 11. Casting composition as defined in claim 1, characterized in that the quartz sand product obtained by partial conversion of quartz sand is only converted to such a degree that the capillary and pore volume accessible from outside remains limited to a value which corresponds to a water absorption of 40 g per 100 g quartz sand product or less.
- 12. Casting composition as defined in claim 1, characterized in that the inorganic filler has a proportion of 40 to 90% by weight of the composition.
- 13. Casting composition as defined in claim 12, characterized in that the inorganic filler consists at least to 50% by volume of a quartz sand product.
- 14. Casting composition as defined in claim 1, characterized in that the inorganic filler consists essentially of the quartz sand product.
- 15. Molded article, produced using a casting composition as defined in claim 1.
- 16. Molded article as defined in claim 15, characterized in that the molded article is a kitchen sink, a counter-top for the kitchen or bathroom or sanitary ware.
Priority Claims (1)
Number |
Date |
Country |
Kind |
95100273 |
Jan 1995 |
EPX |
|
Parent Case Info
This is a continuation of international PCT application No. PCT/EP95/04618 having international filing date of Nov. 23, 1995, which designates the United States.
Foreign Referenced Citations (4)
Number |
Date |
Country |
4304494 |
Aug 1994 |
DEX |
4304494A1 |
Aug 1994 |
DEX |
9310182 |
May 1993 |
WOX |
WO 9310182 |
May 1993 |
WOX |