| 摘要 |
THE PRESENT INVENTION RELATES TO MOULDED THERMOPLASTIC RESIN ARTICLES WITH TRAVERTINE-LIKE APPEARANCE WHICH EXHIBIT SHRINKAGE OF 03 TO 0.5% UPON COOLING AFTER MOULDING PROCESS AND HAVE A DENSITY OF 1.5 TO 1.55 G/CM3. THE ARTICLES COMPRISE 30 - 60 % BY WEIGHT OF STYRENE-BASED RESIN AND 40 - 50 % BY WEIGHT OF STONE POWDER. THE STYRENE-BASED RESIN USED IS SELECTED FROM THE GROUP COMPRISING POLYSTYRENE (PS), HIGH IMPACT POLYSTYRENE (HIPS), STYRENE-ACRYLONITRILE COPOLYMER (SAN), ARYLONITRILE-BUTADIENE-STYRENE TERPOLYMER (ABS) AND BLENDS OF TWO OR MORE THEREOF. THE STONE POWDER USED HAS AN AVERAGE SIZE RANGE OF 600 - 2000 MESH AND IT PREFERABLY COMPRISES LIMESTONE POWDER OR CALCIUM CARBONATE. THE ARTICLES MAY FURTHER COMPRISE 1 - 3% BY WEIGHT OF IMPACT MODIFIER AND/OR 1.5 TO 2% BY WEIGHT OF LUBRICANT. THE ARTICLES ALSO MAY FURTHER COMPRISE 1 - 3% BY WEIGHT OF COLOUR PIGMENTS OR DYES. |
