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US 11,926,738 B2Granted
Active polymer modification of bitumen for use in roofing materials
AssigneeGarland Industries, Inc.
InventorsJason D. Smith, Joseph W. Mellott, II, Melissa Rus, David Sokol, Julia Holland
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Abstract
A modified bitumen consisting of a polyurethane wherein the polyisocyanate or polyisocyanate-dominated polyurethane prepolymer (or prepolymers) is first reacted with the bitumen to take advantage of the bitumen's hydroxyl and amine functionality and form an isocyanate-bitumen adduct to form a weatherproofing product.
Claims38
A method for forming an actively modified polymer-modified bitumen material, said method comprises:
- providing 25-75 wt. % of a first component comprising bitumen, coal tar, or combinations thereof;
- providing 1-49% wt. % of a second component comprising polyisocyanate compound and polyol;
- and,
- adding said second component to said first component to form a mixture and to allow said second component to react with hydroxyl functional groups of said first component to form said bitumen material;
- and
- wherein a content of said polyol in said second component creating a NCO/OH equivalent ratio of 2:1 to 15:1.
3 more elements
A method for forming a roof membrane on a roof, said method comprises:
- a. providing an actively modified polymer-modified bitumen material, said bitumen material comprising 25-75 wt. % of a first component comprising bitumen, coal tar, or combinations thereof, 1-49% wt. % of a second component comprising polyisocyanate compound and polyol;
- and wherein a content of said polyol in said bitumen material in said second component creates a NCO/OH equivalent ratio of 2:1 to 15:1;
- and,
- b. applying said bitumen material to said roof to form a weather-resistant and waterproof membrane on said roof.
1 more element
Dependencies are inferred from the claim text.