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Vistamaxx™ Propylene-based Elastomers as a Replacement or Partial Replacement Polymer System in Bitumen Roofing Applications

IP.com Disclosure Number: IPCOM000238712D
Publication Date: 2014-Sep-12
Document File: 6 page(s) / 33K

Publishing Venue

The IP.com Prior Art Database

Abstract

Bitumen roofing applications currently use polymers modified by styrene-butene-styrene (SBS) (both linear and radial), atactic polypropylene (aPP), or combinations thereof. These roofing systems are made into sheets and rolled. Modified bitumen roofs are often polymer modified to enhance strength and elasticity. SBS polymer-modified bitumen membranes can be installed by using a hot mop of asphalt or cold adhesive. Also SBS modified membranes can be self-adhering if they contain an adhesive backing. aPP polymer-modified bitumen membranes are hot air (heat) welded or torch down-applied. Studies have shown that adding propylene-based elastomer resin(s) to the systems in combination with SBS and aPP allows for reduced cost and could improve low temperature flexibility and physical properties.

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Vistamaxx™ Propylene-based Elastomers as a Replacement or Partial Replacement Polymer System in Bitumen Roofing Applications

Abstract: Bitumen roofing applications currently use polymers modified by styrene-butene- styrene (SBS) (both linear and radial),atactic polypropylene (aPP), or combinations thereof. These roofing systems are made into sheets and rolled. Modified bitumen roofs are often polymer modified to enhance strength and elasticity. SBS polymer-modified bitumen membranes can be installed by using a hot mop of asphalt or cold adhesive. Also SBS modified membranes can be self-adhering if they contain an adhesive backing. aPP polymer-modified bitumen membranes are hot air (heat) welded or torch down-applied. Studies have shown that adding propylene-based elastomer resin(s) to the systems in combination with SBS and aPP allows for reduced cost and could improve low temperature flexibility and physical properties.

Background:

Modified bitumen roofing is commonly put onto low pitch to flat roofs. They are also used in the valleys of higher pitched roofs for greater protection. Polymer-modified bitumen roofing materials were developed in the early 1960s in Europe and have been in use in the U.S. since the mid-1970s. Polymer-modified roof membranes are manufactured into a roll material by the use of reinforcing fabrics that serve as carriers for the hot polymer-modified bitumen. SBS and aPP have been used as the polymer of choice to achieve the desired performance in different climates. An addition of a propylene-based elastomer could bridge the performance between the SBS and aPP to be more suitable in all climate areas.

Development:

SBS (both linear and radial) and aPP materials have been used as the carrier in modified bitumen roofing systems. These approaches have advantages and disadvantages depending on the temperature, where in the world the roofing system is installed, and the installation process itself. SBS is typically very high in molecular weight, imparting good strength and elasticity to the asphalt formulations, but can suffer from poor UV stability due to its unsaturated backbone. aPP is typically very low molecular weight, imparting less strength and elasticity, but providing good UV resistance due to its saturated backbone. Vistamaxx™ propylene-based elastomers ("PBEs") are much higher in molecular weight than they typical aPPs used in the industry, and therefore, provide better strength and elasticity, while also having a saturated backbone for good UV stability. As illustrated in the examples below, Vistamaxx™ PBEs have been shown to be a desirable blend partner with both SBS and aPP in bitumen modification.

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