Method of mixing materials of construction with minor amounts of addition agents
OwnerPaul Haberlinventor
Life of this patent
Estimating the term…
Abstract
Pre-stressed polyethylene foil is shredded mechanically in a closed vessel, whereby it is heated until it shrinks and its surface becomes tacky. When latex is sprayed into the vessel, a thin rubber layer covers each foil fragment and is thermally welded to the polymer surface. The rubber layer traps pockets of aqueous latex in voids of the shrunken foil. The weight and bulk of the resulting material are much greater than the corresponding properties of its rubber content so that precisely measured amounts of rubber may be dispersed quickly and uniformly in hot asphalt for improving the properties of a road surface made from the asphalt mixture. The water content of the rubber-coated plastic fragments improves the working properties of the asphalt mixture.
Claims2
A method of adding a measured amount of at least one addition agent to a basic component which comprises:
- (a) mechanically comminuting a plurality of unitary bodies of a polyolefin until each of said bodies is converted to a multiplicity of particles and said particles are heated by said comminuting to a temperature at which the surfaces of said particles are tacky;
- (b) contacting the tacky surfaces of said particles with said amount of said at least one addition agent and thereby securing said at least one addition agent to said surfaces as a surface coating,
- (1) said amount being smaller than than the weight of said particles;
- (c) cooling the coated particles below said temperature;
- and
- (d) thereafter, substantially uniformly dispersing the coated particles in said basic component;
- wherein said at least one addition agent includes an elastomer dispersed as a latex in an aqueous medium, a portion of the water in said latex being retained in the coated particles, and the remainder of said water being evaporated from the coated particles prior to said dispersing.
A method of adding a measured amount of at least one addition agent to asphalt which comprises:
- (a) mechanically comminuting a plurality of unitary bodies of a polyolefin until each of said bodies is converted to a multiplicity of particles and said particles are heated by said comminuting to a temperature at which the surfaces of said particles are tacky;
- (b) contacting the tacky surfaces of said particles with said amount of said at least one addition agent and thereby securing said at least one addition agent to said surfaces as a surface coating,
- (1) said amount being smaller than the weight of said particles;
- (c) cooling the coated particles below said temperature;
- and
- (d) thereafter, substantially uniformly dispersing the coated particles in said asphalt, wherein said particles are foil fragments enclosing voids, said at least one addition agent includes an aqueous dispersion of a rubber, said liquid being at least partly secured in said voids by said surface coating.
Dependencies are inferred from the claim text.