Laminated adhesive tape and composition therefor
A laminated adhesive tape includes a substrate comprising two or more plies of thin, flexible material, the substrate having a first major surface and a second major surface opposite the first major surface. A polymeric laminating composition comprising a polymer and an alkyl ketene dimer binds the two or more plies and a pressure sensitive adhesive carried on the first major surface. In a further aspect, a method of making a laminated adhesive tape is provided.
1 . A laminated adhesive tape comprising:
(a) a substrate comprising a first ply of warp-knit material and a second ply of nonwoven material, the first ply having a first major surface and the second ply having a second major surface;
(b) a polymeric laminating composition comprising:
(i) a copolymer of vinyl acetate and ethylene (VAE),
(ii) an alkyl ketene dimer, and
(iii) an antioxidant; and
(c) a foamed pressure sensitive adhesive carried on the first major surface;
wherein the laminated adhesive tape is free from a coating release layer;
wherein the laminated adhesive tape is hand tearable.
2 . The laminated adhesive tape of claim 1 , wherein said warp-knit material is formed of a polyester and said nonwoven material is formed of polypropylene.
3 . The laminated adhesive tape of claim 1 , wherein the first ply is impregnated with the polymeric laminating composition.
4 . The laminated adhesive tape of claim 1 , wherein the coating weight of the polymeric laminating composition is in the range of 40 to 100 g/m 2 .
5 . The laminated adhesive tape of claim 1 , wherein the polymeric laminating composition contains from 5-30% of the alkyl ketene dimer by weight after drying.
6 . The laminated adhesive tape of claim 1 , wherein the substrate further includes:
the first ply having a first surface defining the first major surface and a second surface opposite the first surface;
the second ply directly contacting the second surface of the first ply; and
a third ply having a first surface directly contacting the second ply and a second surface opposite the first surface.
7 . The laminated adhesive tape of claim 6 , wherein said third ply is formed of a warp-knit material.
8 . The laminated adhesive tape of claim 6 , wherein said first ply and said third ply are formed of a polyester and said second ply is formed of polypropylene.
9 . The laminated adhesive tape of claim 6 , wherein the first ply is impregnated with the polymeric laminating composition.
10 . The laminated adhesive tape of claim 6 , wherein the coating weight of the polymeric laminating composition is in the range of 20 to 100 g/m 2 .
11 . The laminated adhesive tape of claim 1 , wherein said pressure sensitive adhesive is selected from the group consisting of acrylate, silicone, silicone acrylic copolymer, and styrene butadiene rubber adhesives.
12 . The laminated adhesive tape of claim 11 , wherein the pressure sensitive adhesive comprises one or more of a tackifier, a surfactant, and a colorant.
13 . The laminated adhesive tape of claim 1 , wherein the laminated adhesive tape is rolled up into a roll.