Composite roof structures prepared using one-part moisture curing polyurethane foaming adhesive compositions containing a reversibly blocked catalyst

Inactive Publication Date: 2007-08-14
ASHLAND LICENSING & INTPROP LLC
View PDF17 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]The composite roof structure is prepared by applying the adhesive to the roof deck and setting roofing material in place on the roof deck. If multiple layers of roofing materials are used or in the case of edge overlap the polyurethane adhesive compositions can be used to adhere the multiple layers or edge overlap. In especially hostile e

Problems solved by technology

However, the use of fasteners is undesirable because the method necessitates puncturing the roofing material and the roof deck.
Even where the fasteners are coated with special materials to prevent corrosion and leakage, separation due to movement caused by thermal expansion and contraction, or wind uplift occurs thus compromising the effectiveness of the seal around the fastener.
The numerous holes created by removing old fasteners weakens the integrity of the roof deck and creates routes of entry for water.
The disadvantages of two-part urethane foams as roofing adhesives are obvious.
Disadvantages of conventional one-part, moisture curing, foamable, urethane adhesive form

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example

EXAMPLE 1

[0035]A formulation consisting of a polyether polyol (BASF Pluracol 593), an isocyanate (BASF No. MM103), and a polymeric MDI (BASF No. 255) / blocked catalyst was prepared by first preparing an isocyanate terminated prepolymer. The polyol was stripped of moisture to a level of <200 ppm at 250° F. under vacuum. When the desired moisture level was attained the polyol was cooled to 180° F. and the MDI was added and reacted for one hour at 180° F. The resulting prepolymer was cooled to 130° F. and the polymeric MDI / blocked catalysts added.

[0036]The polymeric MDI / blocked catalysts was prepared by adding polymeric MDI to the reactor, pulling a vacuum (minimum 28 mmHg) and cooling to 15° C. (59° F.), the reactor was blanketed under an inert atmosphere, and a tertiary amine (Huntsman Jeffcat ZF-20) was added. Immediately after the amine addition was completed, paratoluene sulfonylisocyanate, (PTSI) was added at a rate which maintained the temperature rise to a maximum of 21° C. (70°...

Example

EXAMPLE 2

[0038]A prepolymer was prepared according to the procedure of Example 1 using a blend of polyols, a low molecular weight diol (Acclaim 8200) and a tetrol (BASF PEP550) and an isocyanate (Rubinate 9310). Various polymeric MDI (Mondur MRS) / blocked catalysts were prepared as in example 1 using:[0039]a) Huntsman Jeffcat ZF-20[0040]b) Huntsman Jeffcat PMDETA[0041]c) OSI Niax C-5 / Jeffcat PMDETA[0042]d) OSI Niax A-3 / Jeffcat PMDETA the PTSI was added at mol ratios of >1.0 / 1.1 but

[0043]Lapshear specimens were constructed using CDX plywood (1″×4″×⅜″) coupons; coated with the polyurethane adhesives of example 2; mated using an overlap of 1 inch; allowed to cure for 24 hours at ambient conditions, (75° F. / 50% RH); placed in their respective aging environments; room temperature (75° F. / 50% RH), 158° F. circulating air oven, and 158° F. circulating air oven immerse in water. The lapshears were aged as noted and tested for tensile strength (psi) using a cross head speed of 0.5 inches / min...

Example

EXAMPLE 3

[0047]A prepolymer was prepared according to the procedure of Example 1 using a polyol, a 2000 molecular weight diol (Olin Poly G 20-56) and an isocyanate (Rubinate 9310). A polymeric MDI (Mondur MRS) / blocked catalyst was prepared as in Example 1 using:

[0048]Jeffcat T-12

[0049]the PTSI added at mol ratios of >1.0 / 1.1 but <1.0 / 1.7.

[0050]Lapshear specimens were constructed using CDX plywood (1″×4″×⅜″) coupons. The CDX plywood coupons were placed in the respective aging environments, 40° F., 75° F., 120° F., and 158° F. and allowed to equilbrate; coated with the polyurethane adhesives of example 3; mated using an overlap of 1 inch; and the lapshears aged in their respective environments. At 4, 8, 16, 24, and 48 hours bonds were removed from their environments; aged one hour at 75° F., and tested in an Instron at a crosshead speed of 0.5 inches per minute.

[0051]TENSILE STRENGTH, PSI*Environment, ° F.48162448 Hrs4001736839946975272243346402270120103141245182136158498555550537410*...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Fractionaaaaaaaaaa
Fractionaaaaaaaaaa
Fractionaaaaaaaaaa
Login to view more

Abstract

The present invention relates to composite roof structures and their preparation. The composite roof structure is prepared by applying a one-part, moisture curable, foaming, polyurethane adhesive composition to the roof deck, placing the roofing material in contact with the adhesive composition, and allowing the adhesive mixture to foam, fill, and cure. If multiple layer of the roofing material are used to form the composite roof structure, then the above procedure may be used to adhere each of the roofing material layers.

Description

CROSS REFERENCE TO RELATED[0001]APPLICATIONS (NOT APPLICABLE)STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH (NOT APPLICABLE)BACKGROUND OF THE INVENTION[0002]The invention relates to composite roof structures and their preparation. The composite roof structures are prepared by adhering roofing material to a roof deck using a one-part, moisture curable, polyurethane adhesive composition containing dissolved or dispersed therein, reversibly blocked catalysts that are activated by moisture. Once activated by moisture the polyurethane adhesive composition foams in place. The adhesive compositions are storage stable in the absence of moisture and useful as a gap filling adhesive for adhering the roofing material to irregular surfaces.[0003]In the roofing art many different methods are used to secure roofing materials to the roof deck structure, especially flat roofs. Mechanical fasteners have been used to secure roofing materials such as insulation boards and waterproofing membrane to t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): E06B1/00C08G18/10C08G18/32C08G18/71C08G18/79E04D5/14
CPCC08G18/10C08G18/3228C08G18/71C08G18/797C08G2170/60E04D5/143E04D5/148C08G18/307
Inventor STREETS, LINDA C.HATGAS, DAVID J.TOWNSEND, TERRI S.MARGOT, CARRIE D.STREETS, ROGER L.
Owner ASHLAND LICENSING & INTPROP LLC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap