Waterproofing Membrane

a waterproofing membrane and adhesive technology, applied in the direction of film/foil adhesives, synthetic resin layered products, woven fabrics, etc., can solve the problems of difficult to produce a waterproofing membrane that exhibits good performance characteristics brittle at low temperatures and excessive flow, and the use of elastomers alone does not produce the desired performance at both high and low temperatures. , to achieve the effect of excellent sag resistance, excellent adhesion and excellent flexibility

Inactive Publication Date: 2010-08-05
GCP APPL TECH INC
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  • Claims
  • Application Information

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Benefits of technology

This patent describes a type of waterproofing film called a waterproofing membrane that can perform well even at very cold or hot conditions. It consists of two layers: one made of a special kind of resilient material called binder, which holds small bits of bitumen, synthetic rubber, or other materials like rubber. Another layer is made of another special kind of material called bituminum powder, which helps it stick better to the surface of the membrane. When this membrane is applied to various surfaces, such as buildings, vehicles, etc., it becomes difficult to remove due to the lack of strength against heat and moisture. Additionally, there are concerns about environmental issues with current methods of applying these films.

Problems solved by technology

The technical problem addressed by this patent is how to create a waterproofing membrane with better properties at both high and low temperatures while maintaining ease of production and quality control requirements.

Method used

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[0031]Waterproofing membranes having the formulations set out in the Table below were prepared as described previously. The SBS rubber is a blend of 411 (SB)x and 1205 SB (as described earlier). The tire scrap passes through 30 mesh (595 μm). Formulations 1 to 4 are all preferred embodiments of the present invention and meet the combination of desired performance characteristics. Formulation 5, without HDPE, had unacceptable sag at 115° C. (240° F.). Formulations 6 to 8, without ground tire scrap, did not meet one or more of the desired combination of performance characteristics. Formulation 9, with LDPE substituted for HDPE, had unacceptable sag at 115° C. (240° F.). Minimal acceptable adhesion (ASTM D1970 at 75° F. (24° C.)) is at least 1.0 pli (pounds per lineal inch).

TABLETireSagAdhesionViscosityExAsphaltOil(SB)xSBScrapHDPELDPE115° C.LTFpli 24° C.cps 163° C.164166455passpass1.779,0002621546103passpass1.937,000362188444passpass2.98,000459188546passpass564166410failpass2.266717745fai

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Abstract

Disclosed is a waterproofing membrane that performs well at both high and low temperatures. The waterproofing membrane comprises a carrier support layer and an adhesive layer, wherein the adhesive layer comprises a pressure sensitive bitumen composition comprising bitumen (asphalt), synthetic rubber, high density polyethylene, ground vulcanized crumb rubber and, optionally, a plasticizer. The waterproofing membrane also may optionally include a removable release sheet on the adhesive layer.

Description

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Claims

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Application Information

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Owner GCP APPL TECH INC
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