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US 4,585,682 AGranted
Roofing membranes
AssigneeW. R. Grace & Co.
InventorsPeter C. Colarusso, Bahram Siadat
Life of this patent
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Abstract
Waterproofing membranes are disclosed comprising a shrinkable polymer film bonded to a foil layer by a layer of thermoplastic adhesive having sufficient bonding strength below the shrinkage onset temperature of the polymer film to inhibit relative movement between the film and the foil and having sufficient plasticity above the shrinkage onset temperature of the polymer film to permit relative movement between the film and the foil. In a preferred embodiment, the membrane is made self adhesive by including a layer of an adhesive material on that surface of the foil opposite the layer of the thermoplastic adhesive.
Claims31
A laminate membrane assembly comprising:
- (a) a layer of a shrinkable polymer film having a shrinkage onset temperature above 100.degree. F.;
- (b) a layer of a foil having a lower coefficient of thermal expansion than said polymer film below said shrinkage onset temperature;
- and
- (c) a layer of a thermoplastic adhesive postioned between and adhering said film and said foil, said adhesive having sufficient bonding strength below said onset temperature to substantially inhibit relative movement between said film and said foil such that, with increasing temperature below said shrinkage onset temperature, the thermal expansion of said film is controlled by its adherence to said foil and having sufficient plasticity above said shrinkage onset temperature to permit relative movement between said film and said foil such that said film undergoes shrinkage at and above said shrinkage onset temperature without substantial inhibition by its adhesion to said foil while retained in adherent, laminated relationship with said foil;
- and
- (d) an adhesive layer on that side of said foil opposite said layer of a thermoplastic adhesive.
3 more elements
A laminate membrane assembly comprising:
- (a) a layer of a shrinkable polymer film having a shrinkage onset temperature in the range of about 120.degree. F. to 150.degree. F.;
- (b) a layer of a foil having a lower coefficient of thermal expansion than said polymer film below said shrinkage onset temperature;
- and
- (c) a layer of a thermoplastic adhesive positioned between and coextensive with said film and said foil and adhering said film to said foil;
- said thermoplastic adhesive having sufficient bonding strength and rigidity below said shrinkage onset temperature to substantially inhibit relative movement between said film and said foil such that, with increasing temperature below said shrinkage onset temperature, the thermal expansion of said film is controlled by its adherence to said foil;
- and
- said thermoplastic adhesive having sufficient plasticity at and above said shrinkage onset temperature to permit relative movement between said film and said foil such that said film undergoes shrinkage at and above said shrinkage onset temperature without substantial inhibition by its adhesion to said foil while retained in adherent laminated relationship with said foil;
- and
- (d) an adhesive layer on that side of said foil opposite said layer of a thermoplastic adhesive.
6 more elements
A waterproofing roofing assembly comprising a roofdeck substrate having disposed thereover a plurality of membranes comprising:
- (a) a layer of shrinkable polymer film having a shrinkage onset temperature above 100.degree. F.;
- (b) a layer of a foil having a lower coefficient of thermal expansion than said polymer film below said shrinkage onset temperature;
- and
- (c) a layer of a thermoplastic adhesive positioned between and adhering said film and said foil, said adhesive having sufficient bonding strength below said onset temperature to substantially inhibit relative movement between said film and said foil and having sufficient plasticity above said shrinkage onset temperature to permit relative movement between said film and said foil.
1 more element
A self adhesive waterproofing laminate comprising:
- a layer of a shrinkable polymer film which is capable of undergoing about 1% to about 3% shrinkage and has a shrinkage onset temperature above 100.degree. F.;
- a layer of a metal foil which has a lower coefficient of thermal expansion than said polymer film below said shrinkage onset temperature;
- a layer of a thermoplastic adhesive positioned between said film and said foil and adhering said film and said foil;
- said thermoplastic adhesive having sufficient bonding strength and rigidity below said shrinkage onset temperature to substantially inhibit relative movement between said film and said foil such that, with increasing temperature below said shrinkage onset temperature, the thermal expansion of said film is controlled by its adherence to said foil;
- and
- said thermoplastic adhesive having sufficient plasticity at and above said shrinkage onset temperature to permit relative movement between said film and said foil such that said film undergoes shrinkage at and above said shrinkage onset temperature without substantial inhibition by its adhesion to said foil while retained in adherent laminated relationship with said foil;
- and
- a pressure sensitive waterproofing bituminous adhesive layer on that side of said foil opposite said layer of a thermoplastic adhesive.
5 more elements
Dependencies are inferred from the claim text.