Back to results
US 5,981,010 AGranted
Polyurethane-modified bitumen coating composition
AssigneeInterface, Inc.
InventorsC. Edward Terry, Raymond A. Berard, Daniel F. Pinholster, Jr.
Life of this patent
Estimating the term…
Abstract
A polyurethane-modified bitumen coating composition of selected surface tack and fluidity. The composition includes: bitumen; a minor modifying amount of a polyurethane prepared by the reaction of a polyisocyanate and a hydroxyl terminated polybutadiene; a tackifier; and a filler material.
Claims17
A polymer-modified bitumen coating composition adapted for use as a moisture-barrier coating layer, which composition comprises:
- a) bitumen;
- b) a modifying minor amount of a urethane polymer prepared in situ with melted bitumen by the reaction of a polyisocyanate with a long-chain, polydiene hydrocarbon with reactive terminal groups, which groups react with the polyisocyanate to form said a urethane polymer, the urethane polymer mixed and dispersed in the bitumen to form a cross-linked, interpenetrating polymer network, with the urethane polymer chemically bonded to the bitumen by terminal groups;
- c) a tackifier agent in sufficient minor amount to impart surface tackiness to the surface of the bitumen composition;
- d) a minor amount, about 5 to 25 percent by weight, of a particulate filler material;
- and
- e) the bitumen composition characterized by a selected degree surface tackiness and stable fluid properties over a temperature range of about 10 to 125 degrees Fahrenheit.
3 more elements
A polymer-modified bitumen coating composition, which composition comprises:
- a) a bitumen;
- b) a modifying amount of from about 5 to 25 percent by weight of the composition of a urethane polymer prepared in situ with melted bitumen by the reaction of a hydroxyl-terminated polybutadiene with a stoichiometric amount or a slight excess of a diisocyanate, the urethane polymer mixed and dispersed in the bitumen to form an interpenetrating polymer network;
- c) a tackifier agent of a mineral oil in an amount of about 5 to 25 percent by weight of the composition;
- d) a particulate inert filler material having an average particle size of less than about 100 microns and in an amount of from about 5 to 25 percent by weight of the composition;
- and
- e) the bitumen composition, characterized by a selected degree surface tackiness and stable fluid properties over a temperature range of about 10 to 125 degrees Fahrenheit.
3 more elements
Dependencies are inferred from the claim text.