Polyurethane adhesive composition for bonding polymeric roofing materials to roof-deck substrates

• US 5,872,203 A
• Filed: 09/25/1995
• Issued: 02/16/1999
• Est. Priority Date: 09/25/1995
• Status: Expired due to Term

• Current Assignee: ADCO Products LLC (Republic Services Incorporated)
• Original Assignee: ADCO Products Incorporated (Republic Services Incorporated)
• Inventors: Wen, Wei-Jian, Lamb, Kathleen Louise, Briddell, Brian Jonathan
• Primary Examiner(s): GORR, RACHEL F
• Application Number:
  US08/533,640
• Time in Patent Office: 1,240 Days
• Field of Search: 528/66, 528/73, 528/76, 528/85, 528/905, 524/730, 524/773, 524/775, 524/764, 427/423.1, 427/425.1, 427/425.8, 427/424.8
• US Class Current: 528/66
• CPC Class Codes: C08G 18/698 Mixtures with compounds of group C08G18/40
• CPC Class Codes: C08L 2666/28 Non-macromolecular organic substances
• CPC Class Codes: C08L 2666/54 Inorganic substances
• CPC Class Codes: C09J 175/04 Polyurethanes
• CPC Class Codes: E04D 5/142 along the edge of the flexible material
• CPC Class Codes: E04D 5/143 in the field of the flexible material
• CPC Class Codes: E04D 5/148 fastening by gluing
• CPC Class Codes: Y10S 528/905 Polymer prepared from isocyanate reactant has adhesive property
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 428/31587 Hydrocarbon polymer [polyethylene, polybutadiene, etc.]
• CPC Class Codes: Y10T 428/31591 Next to cellulosic
• CPC Class Codes: Y10T 428/31605 Next to free metal

Abstract

A 100% solids polyurethane adhesive composition for bonding polymeric roofing materials to roof-deck substrates is provided which includes two components. The first component comprises a monomeric or polymeric diisocyanate, or a polyurethane prepolymer formed by the reaction of the monomeric or polymeric diisocyanate with a polyol. The second component comprises a polyol selected from the group consisting of a polyether or polyester polyol, an alkanolamine diol, a hydroxyl-terminated homopolymer of polybutadiene, and mixtures thereof. The first and second components are combined such that the ratio of isocyanate groups in the first component to the ratio of hydroxyl groups in the second component is from about 0.5:1 to 1.5:1.

Claims

1. A 100% solids polyurethane adhesive composition for bonding roofing materials comprising:

a) a first component selected from the group consisting of;

monomeric diisocyanates selected from the group consisting of toluene diisocyanate, methylene diphenyl diisocyanate, hexamethyl diisocyanate, isophorone diisocyanate, and hydrogenated methylene diphenyl diisocyanate;

polymeric methylene diphenyl isocyanates formed by the reaction of one of said monomeric diisocyanates;

or a prepolymer formed by the reaction of one of said monomeric diisocyanates or polymeric isocyanates with a polyol selected from the group consisting of polyether and polyester polyols;

b) a second component comprising from about 50 to 60% by weight of a polyether polyol, from about 1 to 5% by weight of a reinforcing diol, from about 5 to 15% by weight of a hydroxyl-terminated homopolymer of polybutadiene, and a tackifier;

wherein the ratio of isocyanate groups in said first component to the ratio of hydroxyl groups in said second component is from about 0.5;

1 to 1.5;

1, and wherein said adhesive composition provides a water-tight seal upon bonding to roofing materials.

2. The adhesive composition of claim 1 in which said tackifier is a liquid hydrocarbon resin selected from the group consisting of polyterpene, rosin esters, hydrogenated phenolic resin, polybutenes, and mixtures thereof.

3. The adhesive composition of claim 1 in which said second component further includes a rheology modifier selected from the group consisting of organoclay, natural clay, and fumed silica.

4. The adhesive composition of claim 1 in which said second component includes an adhesion promoter selected from the group consisting of epoxysilanes, vinylsilanes, mercaptosilanes, organosilanes, and mixtures thereof.

5. The adhesive composition of claim 1 further including a plasticizer selected from the group consisting of phthalates, adipates, sebacates, and trimellitates.

6. The adhesive composition of claim 1 wherein said first component comprises a monomeric diisocyanate or polymeric isocyanate having an isocyanate content of about 33 by weight.

7. The adhesive composition of claim 1 wherein said first component comprises a polyurethane prepolymer having an isocyanate content of from 0.2-10% by weight.

8. The adhesive composition of claim 1 wherein said first component comprises a polyurethane prepolymer formed by reacting from about 65-75% by weight of a polyether polyol and from about 25-35% by weight polymeric methylene dibenzene diisocyanate.

9. The adhesive composition of claim 1 wherein said second component further comprises from about 1-5% by weight of an adhesion promoter.

10. The adhesive composition of claim 1 wherein said polyether polyol has a molecular weight of from 1000 to 4000.

11. A polymeric roofing membrane sealed to a roof-deck substrate with a 100% solids polyurethane adhesive composition to provide a water-tight seal, said adhesive composition comprising:

a) a first component selected from the group consisting of;

monomeric diisocyanates selected from the group consisting of toluene diisocyanate, methylene diphenyl diisocyanate, hexamethyl diisocyanate, isophorone diisocyanate, and hydrogenated methylene diphenyl diisocyanate;

polymeric methylene diphenyl isocyanates formed by the reaction of one of said monomeric diisocyanates;

or a prepolymer formed by the reaction of one of said monomeric diisocyanates or polymeric isocyanates with a polyol selected from the group consisting of polyether and polyester polyols;

b) a second component comprising a polyol selected from the group consisting of a polyether polyol, a polyester polyol, a reinforcing diol, a hydroxyl-terminated homopolymer of polybutadiene, and mixtures thereof;

wherein said first and second components are mixed such that the ratio of isocyanate groups in the first component to the ratio of hydroxyl groups in the second component is from about 0.5;

1 to 1.5;

1.