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US 12,497,545 B2Granted
Separation sheet and use thereof for providing waterproofed structures
AssigneeSika Technology AG
InventorsYizhe Wei, Qin Wei
Life of this patent
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Abstract
A separation sheet includes a polymeric carrier layer, a first adhesive layer, a second adhesive layer, and optionally a first and a second release liner. A method for producing a separation sheet, a method for waterproofing a substrate, a waterproofed substrate, and a use of the separation sheet for bonding of roof membranes to roof substrates.
Claims19
A separation sheet comprising:
- (i) a polymeric carrier layer having a first and a second major surface,
- (ii) a first adhesive layer covering at least a portion of the first major surface of the polymeric carrier layer,
- (iii) a second adhesive layer covering at least a portion of the second major surface of the polymeric carrier layer,
- (iv) a first release liner covering the outwardly facing surface of the first adhesive layer opposite to the side of the polymeric carrier layer, and
- (v) a second release liner covering the outwardly facing surface of the second adhesive layer opposite to the side of the polymeric carrier layer, wherein
- the first adhesive layer is composed of a first adhesive composition and the second adhesive layer is composed of a second adhesive composition different from the first adhesive composition;
- the first adhesive layer is continuous and the second adhesive layer is continuous;
- the first adhesive layer covers at least 50% of the area of the first major surface of the polymeric carrier layer;
- and
- the second adhesive layer comprises a hot-melt adhesive that covers at least 50% of the area of the second major surface of the polymeric carrier layer, wherein
- the hot-melt adhesive comprises a bituminous hot-melt pressure sensitive adhesive comprising:
- (a) 15-95 wt.-% of bitumen,
- (b) 5-35 wt.-% of at least one modifying polymer, and
- (c) 0-40 wt.-% of at least one processing oil,
- all proportions being based on the total weight of the bituminous hot-melt pressure sensitive adhesive.
12 more elements
A separation sheet comprising:
- (i) a polymeric carrier layer having a first and a second major surface,
- (ii) a first adhesive layer covering at least a portion of the first major surface of the polymeric carrier layer,
- (iii) a second adhesive layer covering at least a portion of the second major surface of the polymeric carrier layer,
- (iv) a first release liner covering the outwardly facing surface of the first adhesive layer opposite to the side of the polymeric carrier layer, and
- (v) a second release liner covering the outwardly facing surface of the second adhesive layer opposite to the side of the polymeric carrier layer, wherein
- the first adhesive layer is composed of a first adhesive composition and the second adhesive layer is composed of a second adhesive composition different from the first adhesive composition;
- the first adhesive layer is continuous and the second adhesive layer is continuous;
- the first adhesive layer covers at least 50% of the area of the first major surface of the polymeric carrier layer;
- and
- the second adhesive layer covers at least 50% of the area of the second major surface of the polymeric carrier layer, wherein
- at least one of the first adhesive layer and the second layer comprises an acrylic pressure sensitive adhesive comprising:
- (a) at least 65 wt.-% of at least one acrylic polymer,
- (b) 0.01-5 wt.-% of at least one curing agent,
- (c) 0.1-5 wt.-% of at least one photo initiator, and
- (d) 0-30 wt.-% of at least one tackifying resin,
- all proportions being based on the total weight of the acrylic pressure sensitive adhesive composition.
13 more elements
A separation sheet comprising:
- (i) a polymeric carrier layer having a first and a second major surface,
- (ii) a first adhesive layer covering at least a portion of the first major surface of the polymeric carrier layer,
- (iii) a second adhesive layer covering at least a portion of the second major surface of the polymeric carrier layer,
- (iv) a first release liner covering the outwardly facing surface of the first adhesive layer opposite to the side of the polymeric carrier layer, and
- (v) a second release liner covering the outwardly facing surface of the second adhesive layer opposite to the side of the polymeric carrier layer, wherein
- the first adhesive layer is composed of a first adhesive composition and the second adhesive layer is composed of a second adhesive composition different from the first adhesive composition;
- the first adhesive layer is continuous and the second adhesive layer is continuous;
- the first adhesive layer covers at least 50% of the area of the first major surface of the polymeric carrier layer;
- and
- the second adhesive layer comprises a hot-melt adhesive that covers at least 50% of the area of the second major surface of the polymeric carrier layer, wherein
- the hot-melt adhesive comprises a polymeric hot-melt pressure sensitive adhesive comprising:
- (a) 5-65 wt.-% of styrene block copolymer,
- (b) 10-80 wt.-% of at least one tackifying resin, and
- (c) 5-60 wt.-% of at least one mineral filler,
- (d) up to 25 wt.-% of at least one process oil, and
- (e) 5-50 wt.-% of at least one liquid polyolefin resin,
- all proportions being based on the total weight of the polymeric pressure sensitive adhesive.
14 more elements
Dependencies are inferred from the claim text.