Skid resistant surfaces

a technology of skid resistance and surface, applied in the direction of floor coverings, treads, roof coverings using flexible materials, etc., can solve the problems of difficult or impossible to unroll the underlayment, difficulty in maintaining unrollability, etc., and achieve excellent skid or slip resistance, easy installation, and easy rolling

Inactive Publication Date: 2007-03-01
WR GRACE & CO CONN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] Another embodiment of the invention is a lightweight roofing underlayment having excellent skid or slip-resistance to foot traffic under dry, wet and / or dusty conditions on a sloped surface, and is both readily rollable and unrollable as a coherent unit. The present invention overcomes problems associated with the prior art. The underlayment is preferably a multi-layered sheet material that includes a support layer composed of a film or fabric or both, and a skid or slip resistant layer on one or both faces of the support layer. The skid or slip resistant layer is preferably a pressure sensitive adhesive or a highly filled textured binder. The resulting sheet-like underlayment is sufficiently flexible to allow it to be formed into rolls and readily installed by unrolling over a support structure such as a roof deck. It also provides a sloped walking surface having a high coefficient of friction and excellent skid resistance even when wet and / or dusty, and even at high roof pitches such as those between about 4:12 and 12:12.

Problems solved by technology

However, maintaining unrollability while providing sufficient skid resistance can be problematic, particularly where the skid resistance is due to the tackiness or stickiness of the walking surface.
That is, the same tackiness that is advantageously used to provide skid resistance can make it difficult or impossible to unroll the underlayment, particularly if the unrolling is to be carried out by only one person.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0090] A blocking test was conducted, which is a severe test designed to develop an understanding of blocking on a relative basis. A control membrane, a polyolefin (PO) coated non-woven is easily unrolled. The polyolefin coated control membrane comprises a 2 oz / yd non-woven polypropylene fabric coated on each side with 1.25 mils coex layer. On the side in contact with the skid-resistant layer the coex layer comprise 1.0 mil layer PP / LDPE blend and a 0.25 mils layer comprising a copolymer of ethylene and methyl acrylate. The thin layer faces outward. The coex layer on the other side of the non-woven comprises a 1 mil layer of a PP / LDPE blend and a 0.25 mil layer comprising an ethylene / propylene copolymer. The thin layer faces outward. If an experimental membrane exhibits an ability to unroll as easily or more easily versus the control in the accelerated test, than it is assumed that the experimental membrane will unroll easier than the control under normal circumstances.

[0091] The a...

example 2

[0097] Skid resistance was measured in a “walk on” test as follows. Underlayment specimens to be tested were mechanically attached to a sheet of plywood and positioned at a test angle of 40°. The samples were sprayed with water prior to testing. A tester (“walker”) walks over the sample and compares the wet skid resistance of the sample to a “control”, which was a membrane comprising a 2 side polyolefin-coated polypropylene non-woven described above. The “walker” judges the sample membrane to exhibit better, similar or worse skid resistance versus the control membrane. The results for various underlayments tested are shown in Table 1. Samples 1-13 are embodiments of the present invention and all exhibit superior wet skid resistance in comparison to the control membrane. It's also important to note that water-based binders comprising a surfactant impart poor wet skid resistance. See test results for specimens 25 to 27 in Table 1 where all of the non-skid layers are acrylic emulsions ...

example 3

[0098] Adhesion of the non-skid coating to the support sheet is measured in a peel adhesion test using a pre-formed pressure sensitive tape. A 2″ wide preformed tape, “Preprufe® Tape”, is applied to the non-skid coated face of the underlayment. The sample is rolled 4 times, at 1 second per pass, with a 30 lb roller. Adhesion is measured in a T-peel adhesion test 15 min after rolling at a cross head speed of 2″ per minute with an Instron mechanical tester. Results for various underlayments comprising a woven polypropylene mesh coated with a filled textured binder are shown in Table 2. Note that all underlayments, except for that comprising gilsonite, passes the minimum adhesion requirement for an underlayment comprising a filled textured binder. Also note that the 3 underlayments comprising the acrylic emulsion binders in the non-skid layer also pass the minimum adhesion requirement. However, these underlayments exhibit poor wet skid resistance as noted in example 2 because these bin...

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Abstract

Skid-resistant surfaces as described having either a pressure-sensitive adhesive layer or a highly filled, textured binder to reduce skidding. The surfaces are applied to trafficable surfaces such as roof and floors. Products such as roof underlyments bearing the surfaces are described in particular.

Description

FIELD OF THE INVENTION [0001] The present invention relates to skid-resistant surfaces especially when wet, and in particular to skid-resistant trafficable surfaces such as roofs and floors as well as skid resistant packaging for lumber and the like. BACKGROUND OF THE INVENTION [0002] Roofing underlayments are typically installed over the roof deck and under the primary roof covering or overlayment, which can be asphalt shingles, metal shingles, or metal roofing, tiles such as Spanish or slate tile, wood shakes, concrete, slate, etc. The underlayment provides a secondary moisture barrier to protect the roof deck and building interior from moisture that may penetrate through the primary roof covering. Commercially effective underlayments must maintain their strength and integrity even after exposure to the elements. Underlayments are used both in new construction and in re-roofing projects. [0003] It is known in the waterproofing art to combine a pre-formed waterproofing membrane, su...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E04F15/00
CPCE04D5/10E04D12/002
Inventor WIERCINSKI, ROBERT A.ZALANOWSKI, DAVID P.WESTGATE, PAUL J.JACHIMOWICZ, FELEK
Owner WR GRACE & CO CONN
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