Synthetic material as snow substitute - from particles of mono olefin unsatd (chlorinated) hydrocarbons

摘要

The snow substitute is based on plastics materials such as polymerisates of monoolefin type unsatd. hydrocarbons or chlorinated hydrocarbons. Polymerisate consists of is not 80 wt.% monomer of molecular wt. 40. The synthetic materials have a wt. average molecular wt. 0.1-106 have a granular particle shape, have particles diameter of 10-3000 um, an apparent density which amounts to 5-60% of the density of the polymer. The particles are porous and have a wt. per unit vol. of 0.7-0.98 g/cm3. Specifically used is a mixture from (1) 70-90 pts. wt. of a polypropylene with 1 wt.% soluble in boiling or room temp. xylol and (2) 10-30 pts.wt. of a polypropylne with >99 wt.% soluble in boiling room temp. xylol. Sum of pts.wt. from (1) and (2) = 100. The polypropylenes in (1) and (2) have approximately similar intrinsic viscosities and mol.wt. distributions. The absolute intrinsic viscosity measured in Dekalin at 130 degrees C is in the range 1-15. Particles prepared according to the invention can be applied directly to a provide background to produce a cover of "synthetic snow of the desired thickness. It is generally an advantage to set up the synthetic particles in an intimate mix with water - particles water = 100-10 to 100-100 pts. wt. by e.g. spraying, the outside temperature being over or under 0 degrees C. The particles can be used in a mixture with natura snow or in combination with a brush type artificial snow.