Waterproofing Membrane

a waterproofing membrane and pre-applied technology, applied in the direction of film/foil adhesives, flooring, synthetic resin layered products, etc., can solve the problems of environmental waste, slippery coating, and unsuitable for foot traffi

Inactive Publication Date: 2012-07-19
GCP APPL TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The present invention embraces a waterproofing membrane in the form of a sheet-like laminate that comprises a carrier sheet, a pressure sensitive adhesive layer on one surface of the carrier sheet, and a protective coating layer on the adhesive layer. The protective coating layer comprises polyvinyl acetate (PVAc). Although not necessary, the waterproofing membrane also may optionally include a removable release sheet on the protective coating layer to prevent the membrane from adhering to itself when rolled up. The protective coating layer protects the membrane against weather exposure, tolerates foot traffic and strongly adheres to concrete cast against it.

Problems solved by technology

This release sheet must be removed from the membrane prior to or during installation and disposed in the trash, thus creating environmental waste.
However, the coating can be slippery when wet and, thus, not suitable for foot traffic.
This forces the installer to first unroll then flip over a large, unwieldy membrane prior to installing it.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0051]The properties of certain polymers and copolymers are given in Table 1. Penetration values (dmm) are measured according to ASTM D5 with a 150 g load for 5 seconds.

TABLE 1TgPenetrationNo.PolymerFrom source(° C.)(dmm)APVAc40% in MEKBPVAc (90,000 MW)Solid331 to 2(Vinnapas B100)CPVAc (37,000 MW)Solid331 to 2(Vinnapas B17)DPVAc (20,000 MW)Solid331 to 2(Vinnapas B5)EPVAc - co vinylSolid214laurate 20%(Vinnapas B500 / VL20)FPVAc - co vinylSolid035laurate 40%(Vinnapas B500 / VL40)Gpolymethyl acrylateToluene6(Aldrich)solnHPVAc - co butylAqueous234acrylateemulsion(UCAR 357)IPVAc - co butylAqueous1216acrylateemulsion(UCAR 162)JPVAc - co acrylateAqueous127(Flexbond 381)emulsionKPVAc - co acrylateAqueous193(Flexbond 325)emulsionLPVAc - co ethyleneAqueous022(Airflex 7200)emulsionMPVAc - co ethyleneAqueous08(Airflex 400)emulsion

example 2

[0052]Protective coating layers comprising polyvinyl acetate are prepared in two ways. In one method, a solution of the homopolymer and other ingredients in methyl ethyl ketone (MEK) (or MEK plus toluene for the blend comprising polyvinyl acetate homopolymer and polymethyl acrylate) is prepared. For polymers in emulsion form, the emulsion is first cast into a thick film, dried to remove all water, and then dissolved in MEK. Fillers, plasticizers and stabilizers are added as desired. Additional MEK is added to achieve a desired solids level. A second method involves preparing a formulation in the melt and coating with a laboratory scale roll coater onto a silicone coated PET release liner.

[0053]The solvent based coatings are cast with a draw down bar on to either a silicone coated PET film or a sheet of high-density polyethylene that is not corona treated. The latter substrate is used only if the solution fails to adequately wet the silicone coated PET. Coatings are dried for one hou...

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Abstract

Disclosed is a waterproofing membrane that comprises a carrier sheet, a pressure sensitive adhesive layer on one surface of the carrier sheet, and a protective coating layer on the adhesive layer. The protective coating layer comprises polyvinyl acetate (PVAc). The protective coating layer protects the membrane against weather exposure, tolerates foot traffic and strongly adheres to concrete cast against it.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of application PCT / US2010 / 050396 filed on Sep. 27, 2010, which claims priority from application U.S. Ser. No. 61 / 247,374 filed on Sep. 30, 2009, the disclosures of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to a pre-applied waterproofing membrane that will adhere to concrete applied against its surface.BACKGROUND OF THE INVENTION[0003]Sheet-like waterproofing membrane laminates are well-known for application to concrete and other substrates. These laminates typically comprise a carrier sheet and a pressure sensitive adhesive layer. In many applications, the waterproofing sheet material is applied to a concrete substrate that has already been formed, such as a building foundation. In such a case, the adhesive layer of the membrane is applied against the cured concrete surface. In another technique, the waterproofing membrane is affixed to the concr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B37/14E04F13/02B32B7/12C09J7/21C09J7/38C09J7/40
CPCB32B7/12Y10T428/2835C09J7/0207C09J7/0225C09J7/045C09J2400/263C09J2409/00C09J2431/005C09J2433/005C09J2453/00E02D31/002E04B1/66E04D5/10B32B27/08E04B1/665C09J7/38C09J7/40C09J7/21E04F15/12E04F15/181
Inventor WIERCINSKI, ROBERT A.RANGANATHAN, ANANDAKUMAR
Owner GCP APPL TECH INC
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