Silicone membranes

Patent metadata

Field	Value
Publication number	US-2020011061-A1
Application number	US-201916571338-A
Country	US
Kind code	A1
Filing date	Sep 16, 2019
Priority date	Jul 15, 2016
Publication date	Jan 9, 2020
Grant date	—

Abstract

A method for covering a roof, the method comprising (i) providing first and second silicone membranes, where the membranes are in the form of rolls; (ii) unrolling the first and second silicone membranes over a roof surface; (iii) positioning first and second membranes adjacent to one another and overlapping and edge of the second over an adjacent edge of the first membrane to thereby form a lap; (iv) securing the first and second membranes to the roof surface; and (v) seaming the first membrane to the second membrane in the lap.

First claim

What is claimed is:

1 . A method for covering a roof, the method comprising:
(i) providing first and second silicone membranes, where the membranes are in the form of rolls; (ii) unrolling the first and second silicone membranes over a roof surface; (iii) positioning first and second membranes adjacent to one another and overlapping and edge of the second over an adjacent edge of the first membrane to thereby form a lap; (iv) securing the first and second membranes to the roof surface; and (v) seaming the first membrane to the second membrane in the lap.

2 . The method of claim 1 , where said step of securing includes mechanically fastening the membranes to the roof surface.

3 . The method of claim 1 , where said step of securing includes adhesively securing the membranes to the roof surface.

4 . The method of claim 1 , where said step of seaming the first membrane to the second membrane includes adhesively seaming the membranes.

5 . The method of claim 1 , where the first and second silicone membranes are characterized by tensile strength of 100 psi to 2,000 psi as measured according to ASTM D412.

6 . The method of claim 5 , where the first and second silicone membranes are characterized by elongation at break of 50% to 400% as measured according to ASTM D412.

7 . The method of claim 6 , where the first and second silicone membranes are characterized by a reflectivity of 13% or greater wherein the reflectivity is measured after 3 months of exterior exposure and where the reflectivity is measured using a StellarNet Miniature Spectrometer at 380 nanometers.

8 . The method of claim 7 , where the first and second silicone membranes are characterized by a reflectivity of 20% or greater wherein the reflectivity is measured after 3 months of exterior exposure and where the reflectivity is measured using a StellarNet Miniature Spectrometer at 380 nanometers.

9 . The method of claim 1 , where said step of unrolling includes unrolling the membranes over an insulation panel.

10 . The method of claim 1 , where the first and second membranes are prepared from curable compositions that include a gum-based silicone rubber, a hydroxyl-terminated or vinyl-terminated polysiloxane plasticizer, fumed silica, and a reflective pigment.

11 . A method of preparing a silicone roof membrane having improved durability comprising:
(i) adding a curable silicone composition to a mixer; (ii) heating the curable silicone composition to reduce the viscosity; (iii) adding the curable silicone composition and a curative agent to an extruder assembly to form a silicone membrane; (iv) passing the silicone membrane through a calendar roll to press the silicone membrane into a desired thickness; (v) adding a reinforcing scrim to reinforce the silicone membrane; (vi) heating the silicone membrane in an oven; and (vii) rolling the formed membrane.

12 . A roofing membrane prepared from a composition comprising:
(i) a matrix-forming polymer mixture including
a. 80 to 90 wt % of a silicone rubber; and
b. 10 to 20 wt % of a hydroxyl-terminated polysiloxane plasticizer; a vinyl-terminated polysiloxane plasticizer; or a combination thereof;
(ii) 0.5 to 50 parts by weight of a reinforcing filler based on 100 parts of the matrix-forming polymer mixture; (iii) 1 to 8 parts by weight of a curative agent based on 100 parts of the matrix-forming polymer mixture; and (iv) 1 to 25 parts by weight of a pigment based on 100 parts of the matrix-forming polymer mixture.

Assignees

• Firestone Building Prod Co Llc

Inventors

• Tselepis Arthur J
• Han Hongzhang

Classifications

• E04D5/06 Primary

  by making use of plastics · CPC title

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title

• C08G77/16

  to hydroxy groups · CPC title

• C08L83/04

  Polysiloxanes · CPC title

• B29C43/24

  Calendering · CPC title